GFI MailEssentials Administrator Guide
Advertentie
Advertentie
Administrator Guide
The information and content in this document is provided for informational purposes only and is provided "as is" with no warranties of any kind, either express or implied, including without limitation any warranties of merchantability, fitness for a particular purpose, and non-infringement. GFI Software disclaims and in no event shall be liable for any losses or damages of any kind, including any consequential or incidental damages in connection with the furnishing, performance or use of this document. The information is obtained from publicly available sources. Though reasonable effort has been made to ensure the accuracy of the data provided, GFI makes no warranty, promise or guarantee about the completeness, accuracy, recency or adequacy of information contained in this document and is not responsible for misprints, out-of-date information, or errors. GFI reserves the right to revise or update its products, software or documentation without notice. You must take full responsibility for your use and application of any GFI product or service. No part of this documentation may be reproduced in any form by any means without prior written authorization of GFI Software.
If you believe there are any factual errors in this document, please contact us and we will review your concerns as soon as practical.
GFI and GFI MailEssentials are trademarks or registered trademarks of GFI Software or its affiliates in the US and other countries. Any other trademarks contained herein are the property of their respective owners.
GFI MailEssentials is copyright of GFI Software Development Ltd. - 1999-2016 GFI Software Development Ltd. All rights reserved.
Document Version: 2.3
Last updated (month/day/year): 06-Apr-16
Contents
1.1 Terms and conventions used in this manual
1.2 GFI MailEssentials components
1.5 Email scanning and filtering engines
1.6 Typical deployment scenarios
2 Getting Started with GFI MailEssentials
2.4 Upgrading a previous version
4.2 Information Store Protection
4.3 Trojan and Executable Scanner
5.2 Spam Actions - What to do with spam emails
5.3 Sorting anti-spam filters by priority
5.4 SMTP Transmission Filtering
5.7 SpamTag for Microsoft Outlook
6.3 Advanced Content Filtering
7.4 Working with Quarantined emails
7.7 Quarantine Store Location and Public URL
9.1 Administrator email address
9.2 Enabling/Disabling scanning modules
9.6 Remote Active Directory mode
9.8 SMTP Virtual Server bindings
10.6 POP2Exchange - Download emails from POP3 server
10.7 Moving spam to user’s mailbox folders
10.8 Set a Microsoft® Exchange account
10.9 Exporting and importing settings manually
10.10 Disabling email processing
10.11 Email backup before and after processing
10.13 Monitoring Virus Scanning API
11 GFI MailEssentials Multi-Server
11.1 Features synchronized by Multi-Server
12 Troubleshooting and support
12.3 Scanning engines & filters
12.7 Request technical support
1 Introduction
The scope of this Administrator Guide is to help you install, run, configure and troubleshoot GFI MailEssentials on your network. The table below describes the contents of this guide.
Topics in this chapter:
1.1 Terms and conventions used in this manual
1.2 GFI MailEssentials components
1.5 Email scanning and filtering engines
1.6 Typical deployment scenarios
1.1 Terms and conventions used in this manual
Term
>
Bold text
Italics text
Code
Description
Step by step navigational instructions to access a specific function.
Items to select such as nodes, menu options or command buttons.
Parameters and values that you must replace with the applicable value, such as custom paths and file names.
Indicates text values to key in, such as commands and addresses.
For any technical terms and their definitions as used in this manual, refer to the
.
1.2 GFI MailEssentials components
1.2.1 GFI MailEssentials scan engine
The GFI MailEssentials scan engine analyzes the content of inbound, outbound and internal emails using a number of engines and filters. The result of the analysis identifies whether an email is to be blocked or allowed.
In Microsoft ® Exchange environments, GFI MailEssentials also scans the Microsoft ® Exchange Information Store.
1.2.2 GFI MailEssentials web interface
Through the GFI MailEssentials web interface, you can:
Monitor email scanning activity
Manage scanning and filtering engines
Review and process quarantined emails
Configure email management features
GFI MailEssentials 1 Introduction | 6
1.2.3 GFI MailEssentials Switchboard
Use the GFI MailEssentials Switchboard to configure:
How to launch the GFI MailEssentials user interface
Set Virtual Directory names for the web interface and RSS
Enable/Disable email processing
Setting email backups before and after processing
Setting Quarantine Store location and Quarantine Public URL
Specifying a user account for 'Move to Exchange Folder' and Information Store Protection
Enable/Disable failed mail notifications
1.3 Inbound mail filtering
Inbound mail filtering is the process through which incoming emails are scanned and filtered before delivery to users.
Inbound emails are routed to GFI MailEssentials and processed as follows:
1.
SMTP level filters (Directory Harvesting, Greylist, IP Blocklist & IP DNS Blocklist) can be executed before the email body is received.
2.
The email is scanned by the malware and content filtering engines. Any email that is detected as containing malware is processed according to the actions configured. If an email is considered as safe, it then goes to the next stage.
3.
The email is checked to see if it is addressed to a list in the list server. If the email matches a list, it will be processed by the list server.
4.
The incoming email is filtered by the anti-spam filters. Any email that fails a spam filter check is processed as con figured in the anti-spam actions. If an email goes through all the filters and is not identified as spam, it then goes to the next stage.
5.
If configured, auto-replies are next sent to the sender.
6.
If configured, email monitoring is next executed and the appropriate actions taken.
7.
Email is next checked by the New Senders filter.
8.
If email is not blocked by any scanning or filtering engine, it is sent to the user’s mailbox.
1.4 Outbound mail filtering
Outbound mail filtering is the process through which emails sent by internal users are processed before sending them out over the Internet.
GFI MailEssentials 1 Introduction | 7
When sending an outbound email, this is routed to GFI MailEssentials and processed as follows:
1.
The email is scanned by the malware and content filtering engines. Any email that is detected as containing malware is processed according to the actions configured. If an email is considered as safe, it then goes to the next stage.
2.
Remote commands check and execute any remote commands in email, if any are found. If none are found, email goes to the next stage.
3.
If configured, the applicable disclaimer is next added to the email.
4.
If configured, email monitoring is next executed and the appropriate actions taken.
5.
If enabled, Auto Whitelist adds the recipients' email addresses to the auto-whitelist. This automatically enables replies from such recipients to go to the sender without being checked for spam.
6.
Email is sent to the recipient.
1.5 Email scanning and filtering engines
GFI MailEssentials contains a number of scanning and filtering engines to prevent malicious emails, spam and other unwanted emails from reaching domain users.
1.5.1 Malicious email scanning
The following engines scan and block emails containing malicious content.
Description Email scanning engine
GFI MailEssentials uses multiple antivirus engines to scan inbound, outbound and internal emails for the presence of viruses. GFI MailEssentials ships with Vipre and BitDefender Virus Scanning Engines. You can also acquire a license for Kaspersky, Avira & Intel Security.
Use the Virus Scanning Engines to scan the Microsoft ® Exchange mailbox databases and public folders for viruses.
The Trojan and Executable Scanner analyzes and determines the function of executable files attached to emails.
This scanner can subsequently quarantine any executables that perform suspicious activities (such as Trojans).
The Email Exploit Engine blocks exploits embedded in an email that can execute on the recipient’s machine either when the user receives or opens the email.
The HTML Sanitizer scans and removes scripting code within the email body and attachments.
1.5.2 Content filtering engines
The following engines scan the content of emails, checking for parameters matching configured rules.
GFI MailEssentials 1 Introduction | 8
Email scanning engine
Description
Keyword Filtering enables you to set up rules that filter emails with particular keywords or a combination of keywords in the body or subject of the email.
Attachment Filtering allows you to set up rules to filter what types of email attachments to allow and block on the mail server.
The Decompression engine extracts and analyzes archives (compressed files) attached to an email.
Advanced Content filtering enables scanning of email header data and content using advanced con figurable search conditions and regular expressions (regex).
1.5.3 Anti-spam filtering engines
The following engines scan and block spam emails.
FILTER
DESCRIPTION
An anti-spam engine that determines if an email is spam by using email repu tation, message fingerprinting and content analysis.
Blocks emails that contain links in the message body pointing to known phishing sites or if they contain typical phishing keywords.
Directory harvesting attacks occur when spammers try to guess email addresses by attaching well known usernames to your domain. The majority of the email addresses are non-existent.
ENABLED BY DEFAULT
Yes
Yes
The Email Blocklist is a custom database of email addresses and domains from which you never want to receive emails.
The IP Blocklist is a custom database of IP addresses from which you never want to receive emails.
IP DNS Blocklist checks the IP address of the sending mail server against a public list of mail servers known to send spam.
Stops emails that contain links to domains listed on public Spam URI Blocklists.
This filter uses SPF records to stop email sent from forged IP addresses by identifying if the sender IP address is authorized.
Checks emails received with a sender email address claiming to originate from your own domain against a list of IP addresses by GFI MailEssentials. If the sender
IP address is not on the list of own-domain server IP addresses, email is blocked.
Determines the language of the email body text and configurable to block cer tain languages.
The Header Checking filter analyses the email header to identify spam emails.
This filter enables the identification of Spam based on keywords in the email being received.
An anti-spam filter that can be trained to accurately determine if an email is spam based on past experience.
Yes (only if GFI MailEs sentials is installed in an Active Directory environment)
Yes
No
Yes
Yes
No
No
No
No
No
No
1.5.4 Filters running at SMTP level
The following engines scan and block emails during SMTP transmission before the email is received.
For more information, refer to SMTP Transmission Filtering (page 132).
GFI MailEssentials 1 Introduction | 9
FILTER DESCRIPTION
The IP Blocklist is a custom database of IP addresses from which you never want to receive emails.
Directory harvesting attacks occur when spammers try to guess email addresses by attaching well known usernames to your domain. The majority of the email addresses are non-existent.
IP DNS Blocklist checks the IP address of the sending mail server against a public list of mail servers known to send spam.
The Greylist filter temporarily blocks incoming emails received from unknown senders. Legit imate mail systems typically try to send the email after a few minutes; spammers simply ignore such error messages.
ENABLED
BY
DEFAULT
No
No
Yes
No
1.5.5 Other engines
The following engines help to identify safe emails.
FILTER DESCRIPTION
The Whitelist contains lists of criteria that identify legitimate email. Emails that match these criteria are not scanned by anti-spam filters and are always delivered to the recipient.
The New Senders filter identifies emails that have been received from senders to whom emails have never been sent before.
No
ENABLED
BY
DEFAULT
Yes
1.6 Typical deployment scenarios
This chapter explains the different scenarios how GFI MailEssentials can be installed and configured.
1.6.1 Installing directly on Microsoft
®
Exchange server
Figure 1: Installing GFI MailEssentials on your Microsoft ® Exchange server
You can install GFI MailEssentials directly on Microsoft ® configuration.
Exchange Server 2003 or later, without any additional
In Microsoft ® Exchange 2007/2010 environments, GFI MailEssentials can only be installed on the servers with the following roles:
Edge Server Role, or
Hub Transport Role, or
GFI MailEssentials 1 Introduction | 10
Hub Transport and Mailbox Roles - with this configuration GFI MailEssentials can also scan internal emails for viruses.
In Microsoft
®
Exchange 2013/2016, GFI MailEssentials can only be installed on the servers with the following roles:
Edge Transport role, or
Mailbox role.
NOTE
GFI MailEssentials supports a number of mail servers but can only be installed on the same machine as Microsoft ®
Exchange. For other mail servers, for example Lotus Domino, install GFI MailEssentials on a separate machine.
1.6.2 Installing on an email gateway or relay/perimeter server
Figure 2: Installing GFI MailEssentials on a mail gateway/relay server
This setup is commonly used to filter spam on a separate machine, commonly installed in the DMZ. In this environment a server (also known as a gateway/perimeter server) is set to relay emails to the mail server. GFI MailEssentials is installed on the gateway/perimeter server so that spam and email malware is filtered before reaching the mail server.
This method enables you to filter out blocked emails before these are received on the mail server and reduce unnecessary email traffic. It also provides additional fault tolerance, where if the mail server is down, you can still receive email since emails are queued on the GFI MailEssentials machine.
When installing on a separate server (that is, on a server that is not the mail server), you must first configure that machine to act as a gateway (also known as “Smart host” or “Mail relay” server). This means that all inbound email must pass through GFI MailEssentials for scanning before being relayed to the mail server for distribution. For outbound emails, the mail server must relay all outgoing emails to the gateway machine for scanning before they are sent to destination.
If using a firewall, a good way to deploy GFI MailEssentials is in the DMZ. GFI MailEssentials will act as a smart host/mail relay server when installed on the perimeter network (also known as DMZ - demilitarized zone).
GFI MailEssentials 1 Introduction | 11
Figure 3: Installing GFI MailEssentials on a separate machine on a DMZ
NOTE
If GFI MailEssentials is installed on the perimeter server, you can use the anti-spam filters that run at SMTP level -
Directory Harvesting and Greylist.
NOTE
In Microsoft ® Exchange Server 2007 or later environments, mail relay servers in a DMZ can be running the Edge
Transport Server Role.
NOTE
Configure the IIS SMTP Service to relay emails to your mail server and configure the MX record of your domain to point to the gateway machine.
For more information, refer to Installing on an email gateway or relay/perimeter server (page 18).
1.7 End User Actions
GFI MailEssentials uses Active Directory groups to determine what is displayed to logged in users when they log into GFI
MailEssentials. If the currently logged in user is part of the Administrators group, then GFI MailEssentials loads with all the configuration options that enable setting up GFI MailEssentials. If the currently logged in user is part of the users group, then GFI MailEssentials loads with only a limited number of options that enable the currently logged on user to administer his/her own quarantine and the personal whitelist/blocklists. The url used to log into GFI MailEssentials is always the same one, regardless of whether the currently logged on user is part of the administrator or user Active
Directory group.
NOTE
User actions are only available if GFI MailEssentials is configured to use IIS mode.
For more information, refer to
User interface mode (page 221).
List of features available to user accounts:
GFI MailEssentials 1 Introduction | 12
Feature
Personal Whitelist and Blocklist
Quarantine Search
SpamTag
MailInsights
®
Description
Users may configure a complimentary list of whitelisted and blocklisted email addresses, over and above the list set up by the systems administrator.
This feature is available only when the
and/or
are enabled. By default these options are not enabled.
Allows users to access and manage spam emails that were quarantined. Users can search through, view and then approve or delete quarantined emails.
To make use of this feature, the
must be configured to quarantine spam emails.
Users cannot manage quarantined malware emails due to the security risks involved.
Users can use the SpamTag addon in Microsoft Outlook to manage their preferences in management of spam emails.
SpamTag must be installed on users' machine to be accessible via Microsoft Outlook.
NOTE: This feature is not available to users in the GFI MailEssentials web interface.
For more information, refer to SpamTag for Microsoft Outlook (page 140).
MailInsights
® is a reporting facility that gives a graphical presentation of the top 20 contacts that the user communicated with in the previous 30 days.
For more information on how end-users can use GFI MailEssentials, refer to the GFI MailEssentials End User manual .
GFI MailEssentials 1 Introduction | 13
2 Getting Started with GFI MailEssentials
Want to try out GFI MailEssentials? This topic provides a quick list of actions to help you install and test the functionality of
GFI MailEssentials.
1 Sign up to GFI MailEssentials
Go to http://go.gfi.com/?pageid=ME_TRIALKEY and sign up for GFI MailEssentials. Follow the instructions to have your account created. After filling in the form you will be able to download the GFI MailEssentials installation executable. You will also receive a trial license key via email.
2 Prepare GFI MailEssentials server
Common deployment methods include installing GFI MailEssentials on an email gateway, on a relay/perimeter server or directly on the Microsoft Exchange server. Choose a server within your network that meets or exceeds the GFI MailEssentials
3 Install GFI MailEssentials
Run the GFI MailEssentials executable downloaded in step 1 above, on the server configured in step 2. After installing GFI
4 Launch the GFI MailEssentials Configuration
Go to Start > Programs > GFI MailEssentials > GFI MailEssentials Configuration to launch the web-based interface where you can monitor, manage and configure GFI MailEssentials. Login with administrator credentials.
5 Test your installation
GFI MailEssentials is now ready to start protecting and filtering your mail system from malicious and spam emails. Test your
2.1 System requirements
2.1.1 Hardware requirements
The minimum hardware requirements for GFI MailEssentials are:
Processor
Minimum: 2Ghz
Recommended: 2GHz with multiple cores
Available Memory (RAM)
Minimum: 1.2GB
Recommended: 2GB
Free Disk Space
Minimum: 6GB
Recommended: 10GB
NOTE
Hardware requirements depend on a range of factors including email volume, and number of Anti Virus engines enabled in GFI MailEssentials. The requirements specified above are required for GFI MailEssentials only.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 14
2.1.2 Software requirements
Supported Operating Systems
Windows
®
Server 2003 - Standard or Enterprise (x86 or x64)
Windows
®
Server 2008 - Standard or Enterprise, including R2 (x86 or x64).
More information...
Microsoft
®
Windows Server 2012 - Standard and DataCenter editions, including R2.
More information...
Windows Small Business Server 2003/2008/2011
Supported Mail Servers
GFI MailEssentials can be installed on the following mail servers without any further configuration.
Microsoft
®
Exchange Server 2016
Microsoft
®
Exchange Server 2013
Microsoft
®
Exchange Server 2010
Microsoft
®
Exchange Server 2007 SP1 or higher
Microsoft
®
Exchange Server 2003
For more information, refer to Installing on the Microsoft® Exchange server (page 17).
GFI MailEssentials can also be installed in an environment with any SMTP compliant mail server. In this case, GFI
MailEssentials should be installed on the gateway/perimeter server so that spam is filtered before reaching the mail server.
For more information, refer to Installing on an email gateway or relay/perimeter server (page 18).
Supported Internet browsers
GFI MailEssentials can be used with the following Internet browsers:
Microsoft Internet Explorer 8 or later
Google Chrome version 22.0.1229.94 (October 10, 2012) or later
Mozilla Firefox version 16.0.2 (October 26, 2012) or later.
Other required components
Internet Information Services (IIS ® ) World Wide Web service
Internet Information Services (IIS
®
) SMTP service - Except when installing on Microsoft
®
Exchange 2007 or later server
Microsoft.NET
®
Framework 4
WCF HTTP Activation - required when using
plugin for Microsoft Outlook
Windows
®
2008/2008 R2
Authentication role and Static Content services - Required when installing on Microsoft
®
Windows Server
Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 when installing on Microsoft Exchange
2007 or 2010.
Microsoft XML core services - Installed automatically by GFI MailEssentials when installing on a US/UK English oper ating system.
MSMQ - Microsoft
®
Messaging Queuing Service - for more information refer to:
Installing MSMQ on Windows Server 2012
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 15
Installing MSMQ on Windows Server 2008
Installing MSMQ on Windows Server 2003
NOTE
GFI MailEssentials can also be installed in virtual environments such as Microsoft
® software.
Hyper-V and VMWare virtualization
Microsoft Virtual Server cluster group resource with a physical disc cluster. This is required ning Microsoft
®
Exchange 2003 clusters.
For more information, refer to
ONLY for environments run
Microsoft® Exchange 2003 Clusters (page 21).
NOTE
For more information on how to create a Resource Group for an Exchange Virtual Server in a Windows Server Cluster, refer to: http://go.gfi.com/?pageid=ME_Clusterresourcegrouphowto .
2.1.3 Antivirus and backup software
Antivirus and backup software scanning may cause GFI MailEssentials to malfunction. This occurs when such software denies access to certain files required by GFI MailEssentials.
Disable third party antivirus and backup software from scanning the following folders:
32-bit installations (x86)
<..\Program Files\Common Files\GFI>
64-bit installations (x64)
<..\Program Files (x86)\Common Files\GFI>
<GFI MailEssentials installation path>\GFI\MailEssentials\
<..\Inetpub\mailroot> - if installed on a gateway machine.
<..\Program Files\Exchsrvr\Mailroot> - if installed on the same machine as Microsoft
®
Exchange 2003
TransportRoles folder located in the default Microsoft
® machine as Microsoft
®
Exchange 2007 or later.
Exchange installation path when GFI MailEssentials is installed on the same
2.1.4 Firewall port settings
Configure your firewall to allow the ports used by GFI MailEssentials.
Port
53 - DNS
20 & 21 -
FTP
Description
Used by the following anti-spam filters:
IP DNS Blocklist
SpamRazer
URI DNS Blocklist
Used by GFI MailEssentials to connect to ftp.gfi.com and retrieve latest product version information.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 16
Port
80 - HTTP
9090, 9091 -
Remoting
9095, 9096 -
Multi-Server
389/636 -
LDAP/LDAPS
Description
Used by GFI MailEssentials to download product patches and updates for:
SpamRazer
Anti-Phishing
Bayesian Analysis
Antivirus definition files
Trojan and executable scanner
Email Exploit engine
GFI MailEssentials downloads from the following locations: update.gfi.com
update.gfisoftware.com
support.gfi.com
*.mailshell.net
*.rules.mailshell.net
spamrazer.gfi.com
db11.spamcatcher.net
cdnupdate.gfi.com
cdnpatches.gfi.com
These ports are used for inter-process communication. No firewall configuration is required to allow connections to or from the remoting ports since all the GFI MailEssentials processes run on the same server.
NOTE: Ensure that no other applications (except GFI MailEssentials) are listening on these ports. If other applications
These TCP ports are used for communications between GFI MailEssentials servers that are joined to the Multi-Server network. Ensure that the master and all salve servers can communicate together via these ports.
This port is used in these scenarios:
Remote Active Directory mode - When the GFI MailEssentials server is not joined to an Active Directory domain, but retrieves the list of users from a remote Active Directory instance.
Microsoft ® Exchange environment - Required if the server running GFI MailEssentials does not have access to or cannot get list of users from Active Directory, for example, in a DMZ environment or other environments which do not use Active Directory.
Lotus Domino mail server environment - Required to get email addresses from Lotus Domino server.
Other SMTP mail server environments - Required to get email addresses from SMTP server.
2.2 Pre-installation actions
Before installing GFI MailEssentials, prepare your environment for deployment.
Topics in this chapter:
Installing on the Microsoft Exchange server
Installing on an email gateway or relay/perimeter server
Microsoft Exchange 2003 Clusters
2.2.1 Installing on the Microsoft
®
Exchange server
When installing GFI MailEssentials on the same server as Microsoft
® configurations are required.
Exchange 2003 or later, no pre-install actions or
In Microsoft
®
Exchange 2007/2010 environments, GFI MailEssentials can only be installed on the servers with the following roles:
Edge Server Role, or
Hub Transport Role, or
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 17
Hub Transport and Mailbox Roles - with this configuration GFI MailEssentials can also scan internal emails for viruses.
In Microsoft
®
Exchange 2013/2016, GFI MailEssentials can only be installed on the servers with the following roles:
Edge Transport role, or
Mailbox role.
2.2.2 Installing on an email gateway or relay/perimeter server
GFI MailEssentials can be installed:
On a perimeter server (for example, in a DMZ)
As a mail relay server between the perimeter (gateway) SMTP server and mail server.
This setup is commonly used to filter spam on a separate machine, commonly installed in the DMZ. In this environment a server (also known as a gateway/perimeter server) is set to relay emails to the mail server. GFI MailEssentials is installed on the gateway/perimeter server so that spam and email malware is filtered before reaching the mail server.
GFI MailEssentials uses the IIS SMTP service as its SMTP Server and therefore the IIS SMTP service must be configured to act as a mail relay server. To do this:
Step 1: Enable IIS SMTP Service
Step 2: Create SMTP domains for email relaying
Step 3: Enable email relaying to your mail server
Step 4: Secure your SMTP email-relay server
Step 5: Enable your mail server to route emails via gateway
Step 6: Update your domain MX record to point to mail relay server
Step 7: Test your new mail relay server
Step 1: Enable IIS SMTP Service
Windows Server 2003
1. Go to Start > Control Panel > Add or Remove Programs > Add/Remove Windows Components .
2. Select Application Server and click Details .
3. Select Internet Information Services (IIS) and click Details .
4. Select the SMTP Service option and click OK .
5. Click Next to finalize your configuration.
Windows Server 2008
1. Launch Windows Server Manager.
2. Navigate to the Features node and select Add Features .
3. From the Add Features Wizard select SMTP Server .
NOTE
The SMTP Server feature might require the installation of additional role services and features. Click Add
Required Role Services to proceed with installation.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 18
4. In the following screens click Next to configure any required role services and features, and click Install to start the installation.
5. Click Close to finalize configuration.
Step 2: Create SMTP domain(s) for email relaying
1. Go to Start > Control Panel > Administrative Tools > Internet Information Services (IIS) Manager .
2. In the left pane, expand the respective server node. Right click Default SMTP Virtual Server and select Properties .
4. Expand Default SMTP Virtual Server node.
5. Right click Domains and select New > Domain .
6. Select Remote and click Next .
7. Specify organization domain name (for example, test.mydomain.com) and click Finish .
Step 3: Enable email relaying to your mail server
1. Right click on the new domain and select Properties .
2. Select Allow the Incoming Mail to be Relayed to this Domain .
3. Select Forward all mail to smart host and specify the IP address of the server managing emails in this domain. IP address must be enclosed in square brackets, for example, [123.123.123.123] , to exclude them from all DNS lookup attempts.
4. Click OK to finalize your configuration.
Step 4: Secure your SMTP email-relay server
If unsecured, your mail relay server can be exploited and used as an open relay for spam. To prevent this, it is recommended that you specify which mail servers can route emails through this mail relay server (for example, allow only specific servers to use this email relaying setup). To achieve this:
1. Go to Start > Control Panel > Administrative Tools > Internet Information Services (IIS) Manager .
2. In the left pane, expand the respective server node. Right click on Default SMTP Virtual Server and select Properties .
3. From the Access tab, select Relay .
4. Select Only the list below and click Add .
5. Specify IP(s) of the internal mail server(s) that are allowed to route emails through your mail relay server. You can specify:
Single computers - Authorize one specific machine to relay email through this server. Use the DNS Lookup button to lookup an IP address for a specific host.
Group of computers - Authorize specific computer(s) to relay emails through this server.
Domain - Allow all computers in a specific domain to relay emails through this server.
NOTE
The Domain option adds a processing overhead that can degrade SMTP service performance. This is due to the reverse DNS lookup processes triggered on all IP addresses (within that domain) that try to route emails through this relay server.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 19
Step 5: Enable your mail server to route emails via GFI MailEssentials
Microsoft ® Exchange Server 2003
Set up SMTP connectors that forward all emails to GFI MailEssentials.
1.
Start Exchange System Manager .
2.
Right-click Connectors , click New > SMTP Connector and specify a connector name.
3.
Select Forward all mail through this connector to the following smart host , and specify the IP of your GFI MailEs sentials relay server within square brackets, for example, [123.123.1.123] .
4.
Click Add and select the GFI MailEssentials email relay server.
5.
Click OK .
6.
Go to Address Space tab.
7.
Click Add , select SMTP and click OK .
8.
Enter domain name and click OK
9.
Select Allow messages to be relayed to these domains .
10.
Click OK .
Lotus Notes
For more information on how to setup Lotus Domino routing, refer to
.
SMTP/POP3 mail server
Configure your mail server to route all inbound and outbound email through GFI MailEssentials. In the configuration program of your mail server, use the option to relay all outbound email via another mail server (this option is usually called something similar to Forward all messages to host . Enter the computer name or IP of the machine running GFI
MailEssentials. Save the new settings and restart your mail server.
Step 6: Update your domain MX record to point to mail relay server
Update the MX record of your domain to point to the IP of the new mail relay server. If your DNS server is managed by your ISP, ask your ISP to update the MX record for you.
NOTE
If the MX record is not updated, all emails will be routed directly to your email server - hence bypassing GFI
MailEssentials.
Verify that MX record has been successfully updated
To verify whether MX record is updated:
1. From command prompt key in nslookup and hit Enter .
2. Key in set type=mx and hit Enter .
3. Specify your mail domain name and hit Enter .
The MX record should return the IP addresses of the mail relay servers.
Step 7: Test your new mail relay server
Before proceeding to install GFI MailEssentials, verify that your new mail relay server is working correctly.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 20
Test IIS SMTP inbound connection
1. Send an email from an ‘external’ account (example, from a Gmail account) to an internal email address/user.
2. Ensure that intended recipient received the test email in the respective email client.
Test IIS SMTP outbound connection
1. Send an email from an ‘internal’ email account to an external account (example, to a Gmail account).
2. Ensure that the intended recipient/external user received the test email.
NOTE
You can also use Telnet to manually send the test email and obtain more troubleshooting information. For more information refer to: http://go.gfi.com/?pageid=ME_TelnetPort25
2.2.3 Microsoft
®
Exchange 2003 Clusters
This topic contains instructions on how to install and uninstall GFI MailEssentials on Microsoft
®
Exchange 2003 clusters.
A cluster is a group of servers, technically known as nodes, working collectively as a single server. Such environment provides high availability and fail over mechanisms to ensure constant availability of resources and applications including email infrastructures. If one of the nodes in the cluster fails/is not available, resources and applications switch to another cluster node.
NOTE
GFI MailEssentials can only be installed in an Active-Passive cluster environment. In an active/passive cluster, a
‘failover’ mechanism ensures that whenever an active cluster fails, one of the available passive nodes becomes active
(i.e. takes over the role of the failed node).
To install GFI MailEssentials on a Microsoft
®
Exchange Server 2000/2003 cluster ensure that:
Any running applications are closed.
Microsoft
®
Exchange Server 2000/2003 is installed in clustered mode.
An Exchange Virtual Server cluster group resource exists and includes, among other things, a Physical Disk cluster resource.
All cluster nodes should be turned off, except the node where GFI MailEssentials will first be installed.
1.
Start the installation process and ensure that:
All files are installed on the shared hard drive
You are installing on the machine’s Default Website
2.
On completion, start default website using IIS Manager.
3.
Go to Control Panel > Administrative Tools > Cluster Administrator and create a new resource group (Right click
Groups > New > Group ).
4.
Key in GFI MailEssentials as the name and Services for GFI MailEssentials as the description. Click Next .
5.
Move all available nodes to Preferred Owners and click Finish .
6.
Right click GFI MailEssentials > New > Resource .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 21
7.
Set the name as GFI List Server .
8.
Set Resource Type to Generic Service and click Next .
9.
Set all available nodes to possible owners and click Next .
10.
Click Next .
11.
Set service name to listserv and click next.
12.
Click Finish .
13.
Repeat steps 7 to 12 with the following details:
Name
GFI MailEssentials AS Scan Engine
GFI MailEssentials Attendant
GFI MailEssentials Autoupdater
GFI MailEssentials AV Scan Engine
GFI MailEssentials Backend
GFI MailEssentials Enterprise Transfer
Service Name gfiscans gfimesattendant gfimesavupdate
GFIScanM gfimesbackend gfimetrxsvc
GFI MailEssentials Legacy Attendant gfiasmsecatt
GFI MailEssentials Quarantine Action Services gfimesqashost
GFI POP2Exchange gfipop2exch
14.
On completion, bring the GFI MailEssentials group online.
15.
Shut down this node and start a new node.
16.
Repeat steps 1 and 2 for all cluster nodes.
Uninstalling GFI MailEssentials in a cluster environment
Ensure that only one cluster node is turned on; the rest should all be turned off.
1.
Stop all GFI services
2.
Backup all the contents of theGFI MailEssentials installation folder to a different location.
3.
Delete all GFI Services from the Cluster Resources from the group GFI MailEssentials.
4.
Start all GFI services and ensure all cluster services and Exchange services are up and running.
5.
Uninstall from first Node.
6.
Open the Services applet to ensure that there are no GFI MailEssentials services which were not deleted. For each ser vice that is still present in the Services applet, run the following command in command prompt: sc delete <Service Name> . For example run sc delete gfiasmsecatt if the GFI MailEssentials Legacy Attendant is still present.
7.
Open the system Registry Editor and delete the key: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\GFI
8.
Copy the backup of GFI MailEssentials to where it was installed.
9.
Turn off the current node and start the next node. Ensure all cluster services, Exchange services and GFI MailEssentials services are up and running
10.
Uninstall GFI MailEssentials.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 22
11.
Open the Services applet to ensure that there are no GFI MailEssentials services which were not deleted. For each service that is still present in the Services applet, run the following command in command prompt: sc delete
<Service Name> . For example run sc delete gfiasmsecatt if the GFI MailEssentials Legacy Attendant is still present.
12.
Repeat steps 7 to 11 for all remaining nodes.
13.
Delete the GFI MailEssentials installation folder and its backup. From cluster administrator delete all GFI services.
2.2.4 Lotus Domino
Information on using GFI MailEssentials with Lotus Domino.
Lotus Domino incompatibilities
Installation information for Lotus Domino
Lotus Domino Anti Spam Folder Configuration
Lotus Domino incompatibilities
Internal memos/emails are not scanned
GFI MailEssentials does not scan internal memos/emails sent by Lotus Domino since the Lotus Domino’s sender/receiver format is not in a compatible format. When internal memos/emails are passed into GFI MailEssentials, these end up in the queue and are not processed.
NOTE
Do not pass internal memos/emails through GFI MailEssentials.
GFI MailEssentials List Server will not work with Lotus Domino
Creating Newsletters or discussion lists will not work for the internal domain of Lotus Domino. This option should not be used. If used, Lotus Domino users will not be able to send emails to the list.
GFI MailEssentials Installation Guide for Lotus Domino
Use the information in this section to install and configure Lotus Domino with GFI MailEssentials. Install GFI MailEssentials on a separate machine then Lotus Domino, as seen on the figure below.
Figure 4: GFI MailEssentials installation on a separate server than Lotus Domino
Install GFI MailEssentials by running the GFI MailEssentials installation file and following the onscreen instructions.
For more information, refer to Getting Started with GFI MailEssentials (page 14).
If GFI MailEssentials is installed on a machine where Active Directory is present, one may encounter the dialog box below. Select No, I do not have Active Directory… to install GFI MailEssentials in SMTP mode.
Configure the machine where GFI MailEssentials is installed to act as a gateway (also known as "Smart host" or "Mail relay" server) for all email. Effectively, all inbound email must pass through this machine before relayed to the mail server for distribution (it is the first to receive all emails destined for your mail server).
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 23
The same applies for outbound emails; mail server must relay all outgoing emails to the gateway machine for scanning before these are sent to external recipients via Internet (it must be the last 'stop' for emails destined for the Internet). In this way, GFI MailEssentials checks all inbound and outbound mail before it is delivered to the recipients.
The MX record of your domain must point to the mail relay server
NOTE
If your ISP manages the DNS server, ask this provider to update it for you.
Since the new mail relay server must first receive all inbound email, update the MX record of your domain to point to the
IP of the new mail relay/Gateway server.
Verify the MX record of your DNS server as follows:
1.
From command prompt, type nslookup and press Enter .
2.
Type set type=mx and press Enter .
3.
Type your mail domain and press Enter .
The MX record should return a single IP that corresponds to the IP address of the machine running GFI MailEssentials.
Screenshot 1: Verifying the MX record of the DNS
4.
Test the new mail relay server. Before proceeding to install GFI MailEssentials, verify that the new mail relay server is working correctly.
5.
Test the IIS SMTP inbound connection of the mail relay server by sending an email from an external account to an internal user (use web-mail, for example mail.live.com
,if you do not have an external account available). Verify that the email client received the email.
6.
Test the IIS SMTP outbound connection of your mail relay server by sending an email to an external account from an email client. Verify that the external user received the email.
NOTE
Alternatively, instead of an email client, send email manually through Telnet. This will give you more troubleshooting information.
For more information, refer to: http://support.microsoft.com/support/kb/articles/Q153/1/19.asp
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 24
Configuring Lotus Domino to send outbound emails through GFI MailEssentials
To direct all outgoing emails to the server where GFI MailEssentials is installed, Lotus Domino needs to be configured as below.
1. From the Lotus Domino Administrator, click Configuration tab and select Server > Configurations .
Screenshot 2: Lotus Domino Administrator - click Configurations option.
2.
After configuration section is selected, main window will show the configuration of the server. Select desired server and click Edit configuration .
Screenshot 3: Click Edit Configuration
From the configuration document page, select Router/SMTP tab and ensure that Basics is selected. Double click on content to enable edit mode. Select Relay host for messages leaving the local internet domain and enter the IP
Address of the machine that GFI MailEssentials is installed. Click Save and Close to save configuration document.
Lotus Domino LDAP Settings
From Lotus Domino, enable Directory Catalog and Directory Assistance. In the Directory Assistance database, click Add
Directory Assistance to create a new Assistance document. In the document, one must enable the LDAP clients under
Make this domain available to as follows:-
Screenshot 4: Lotus Domino LDAP Settings
In the server configuration one must edit the credentials under the configuration. Anonymous authentication must be enabled so that GFI MailEssentials can access the Lotus Domino LDAP.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 25
Screenshot 5: Enable Anonymous Authentication
Lotus Domino Anti Spam Folder Configuration
1.
From Lotus Notes Administrator, create a database with the normal MAIL85.NTF template, that is used as the public folder. When the database is created, right click the database from the files section and select Access Control . Con figure the user or group or server to have access on the database.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 26
Screenshot 6: Create a new database
2.
Convert the database using the server console by typing: load convert -e -h mail\public.nsf
Command should display the following results.
Screenshot 7: Load convert result
3.
On completion, ensure that the database is accessible from IMAP service. From the Lotus Notes Administrator, go to
Configuration , and select the Files tab. Highlight the database of the public folder, click Edit , select Copy as Link and click Application Link .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 27
Screenshot 8: Copy to the clipboard a link to the current application
4.
From the configuration, go to Messaging Settings and select IMAP tab.
Screenshot 9: Include all public and other users’ folders when a folder list is requested
5.
Select Public and Other Users’ Folders tab. Right click and paste on the Public Folders Database Links and enable the Include all public and other users folders when a folder list is requested ’.
6.
Save and close the document.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 28
Screenshot 10: New mail-in database
7.
From the Lotus Notes Administrator, configure the folder for mail usage. Go to People and Groups and select Mail-In
Database . Create a new Mail-in Database and in the whole directory path enter the full path (for example, Mail\pub lic.nsf).
8.
Save and close the document.
9.
From the GFI MailEssentials web interface, expand AntiSpam and select AntiSpam Settings .
10.
On the right hand pane, select Public Folder Scanning tab and select Enable Public Folder Scanning .
11.
From the IMAP configuration section, enter the IMAP server (your Lotus Domino server, Port and the credentials of the user to access the folder).
NOTE
The test button will not function.
12.
Click Apply to save modifications.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 29
Screenshot 11: Enable Public Folder Scanning
13.
From the registry , change values to use this function. From the registry select HKEY_LOCAL_
MACHINE\SOFTWARE\GFI\ME12\ATTENDANT\RPFOLDERS:5 and create the following Key String Value as follows:
Name/Value
SharedNamespace Public Folders\\Public Folder
FolderDelimiter \\
2.3 Installation procedure
This section describes how to run the installation of GFI MailEssentials.
2.3.1 Important notes
1.
If you are currently using a previous version of GFI MailEssentials, you can upgrade your current installation while at the same time retaining all your existing configuration settings. Upgrade is not reversible; you cannot downgrade to the
previous version you had installed.
For more information, refer to Upgrading a previous version (page 38).
2.
If you are currently on SMA and you want to upgrade, access the GFI website customer area to upgrade your current license key.
3.
GFI MailEssentials installation restarts Microsoft
®
Exchange or Microsoft IIS
®
SMTP services. This is required to allow GFI
MailEssentials components to register correctly. It is recommended to install GFI MailEssentials at a time when restarting these services has the least impact on your network.
4.
Before running installation wizard, ensure that:
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 30
You are logged on using an account with administrative privileges.
The machine where GFI MailEssentials is going to be installed, meets the specified system requirements.
For more information, refer to System requirements (page 14).
Configure your firewall to allow GFI MailEssentials to connect to GFI servers.
For more information, refer to Firewall port settings (page 16).
Disable third-party antivirus and backup software from scanning folders used by GFI MailEssentials.
For more inform ation, refer to Antivirus and backup software (page 16).
If installing GFI MailEssentials on an email gateway or relay/perimeter server, configure that machine to act as a gate way.
For more information, refer to Installing on an email gateway or relay/perimeter server (page 18).
Save any pending work and close all open applications on the machine.
2.3.2 Running the installation wizard
1.
Run the GFI MailEssentials setup program.
2.
Select the language to use with this installation of GFI MailEssentials. Accept the terms and conditions and click Next .
NOTE
Language selection is not reversible. You will need to reinstall GFI MailEssentials to change the language selected at this stage.
Screenshot 12: Specifying a license key
3.
Enter a valid license key and click Next .
NOTE
'Evaluation' is no longer accepted as a license key. Access the GFI website customer area to upgrade your license key before starting the upgrade process.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 31
4.
Select the mode that GFI MailEssentials will use to retrieve the list of email users.
NOTE
The GFI MailEssentials user mode cannot be changed after installation.
Option
Active Directory
SMTP
Description
Option only available when installing GFI MailEssentials on a machine that is joined to an Active
Directory domain.
GFI MailEssentials retrieves the list of mail-enabled users from Active Directory. Selecting this option means that GFI MailEssentials is being installed behind your firewall and that it has access to the Active
Directory containing ALL your email users.
Select this mode if an Active Directory domain is not available or if you would like to manage the list of users manually.
In this mode, GFI MailEssentials automatically populates the list of local users using the sender’s email address in outbound emails. The list of users can also be managed from the GFI MailEssentials General
Settings node. For more information, refer to Managing local users (page 213).
Remote Active Directory Option only available when installing GFI MailEssentials on a machine that is NOT joined to an Active
Directory domain.
In this mode, GFI MailEssentials retrieves the list of users from a remote Active Directory domain, even though the GFI MailEssentials server is not joined to a domain. This mode can be used for example, when installing GFI MailEssentials in a DMZ, before the firewall that separates your internal and external networks. In this example, the GFI MailEssentials is typically not joined to the internal domain. In this mode, all other features of GFI MailEssentials function similarly to when GFI MailEssentials is joined to a domain.
When choosing this option, in the next screen specify the details of the Remote Domain Controller to use. Ensure that GFI MailEssentials can communicate with this server using LDAP, which by default uses port 389 (or port 636 when using an SSL certificate).
Click Next .
5.
Configure the Administrator Email Address and the SMTP Server Configuration.
Option
Administrator
Address
SMTP
Server Setup
Description
Specify the administrator email address to use for notifications about product status.
Select the SMTP Server that GFI MailEssentials binds to. By default, GFI MailEssentials binds to your Default SMTP
Virtual Server. If you have multiple SMTP virtual servers on your domain, you can bind GFI MailEssentials to any available SMTP virtual server.
NOTES
1. If you are installing on a Microsoft
Microsoft
®
®
Exchange Server 2007 or later machine this option is not shown since
Exchange has its own built-in SMTP server.
2. After installation, you can still bind GFI MailEssentials to another SMTP virtual server from the GFI MailEssentials
Configuration. For more information, refer to SMTP Virtual Server bindings (page 215).
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 32
Screenshot 13: Web server and virtual directory details
6.
In the Web Server Setup dialog, configure the following options:
NOTE
Default settings are typically correct for most installations.
Option
IIS Website
Configuration Path
RSS Path
Description
Select the website where you want to host the GFI MailEssentials virtual directories.
Specify a name for the GFI MailEssentials virtual directory.
Specify a name for the GFI MailEssentials Quarantine RSS feeds virtual directory.
Click Next .
7.
Select folder where to install GFI MailEssentials and click Next . When the installation is an upgrade, GFI MailEssentials installs in the same location as the previous installation.
8.
Click Install to start the installation process. If you are prompted to restart the SMTP services, click Yes .
9.
On completion, click Finish .
NOTE
For new installations, setup automatically launches the Post-Installation Wizard.
For more information, refer to Post-
Installation Wizard (page 33).
2.3.3 Post-Installation Wizard
The post-installation wizard loads automatically after installing GFI MailEssentials the first time. It enables configuration of the most important settings of GFI MailEssentials.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 33
1.
Click Next in the welcome page.
Screenshot 14: DNS Server settings
2.
In the DNS Server dialog, select:
Option
Use the same DNS server used by this server
Use an alternate DNS server
Description
Select this option to use the same DNS server that is used by the operating system where GFI
MailEssentials is installed.
Select this option to specify a custom DNS server IP address.
Click Test to test connection with the specified DNS server. If test is unsuccessful, specify another DNS server. Click Next .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 34
Screenshot 15: Proxy settings
3.
In the Proxy Settings dialog, specify how GFI MailEssentials connects to the Internet. If the server connects through a proxy server click Configure proxy server… and specify proxy settings. Click Next .
Screenshot 16: Inbound email domains
4.
In the Inbound email domains dialog specify all the domains to scan for viruses and spam. Any local domains that are not specified in this list will not be scanned. Click Next .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 35
NOTE
When adding domains, select Obtain domain’s MX records and include in perimeter servers list to retrieve the domain’s MX records and automatically add them to the perimeter SMTP servers list (configured in the next step).
Screenshot 17: SMTP Server settings
5.
In the SMTP Servers dialog specify how the server receives external emails. If emails are routed through other servers before they are forwarded to GFI MailEssentials, add the IP address of the other servers in the list. For more information about perimeter SMTP servers refer to: http://go.gfi.com/?pageid=ME_PerimeterServer . Click Next .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 36
Screenshot 18: Selecting the default anti-spam action to use
6.
In the Default anti-spam action dialog select the default action to be taken when emails are detected as spam. This action applies to anti-spam filters only. Malware filters automatically quarantine blocked emails.
For more information, refer to Email scanning and filtering engines (page 8).
NOTE
When installing on Microsoft
®
Exchange 2010 or later, and the default action selected is Move to sub folder in recipient's Exchange mailbox , a user with impersonation rights must be created. Select whether to let GFI
MailEssentials automatically create the user or manually specify the credentials and click Set access rights to assign the required rights to the specified user. This user must be dedicated to this feature only and the credentials must not be changed.
For more information, refer to Set a Microsoft® Exchange account (page 235).
Click Next .
7.
When installing on Microsoft
®
Exchange Server 2007 or newer, the list of Microsoft
® and GFI MailEssentials components required is displayed. Click ponents.
Exchange server roles detected
Next to install the required GFI MailEssentials com
8.
Click Finish to finalize the installation.
GFI MailEssentials installation is now complete and the email protection system is up and running.
Next step: Optimize your protection system to ensure that it is effectively up and running.
For more information, refer to Post-Install actions (page 38).
NOTE
To re-run the Post-Installation wizard, from command prompt, navigate to the GFI MailEssentials installation folder and run the following command: e2k7wiz.exe clean
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 37
2.4 Upgrading a previous version
This topic describes how to upgrade a GFI MailEssentials installation to the latest version while retaining all settings.
Important notes when upgrading
1.
This procedure is supported only when upgrading from GFI MailEssentials version 2012 or higher.
2.
Before upgrading to the latest version of GFI MailEssentials, ensure your system meets the minimum system require ments.
For more information, refer to System requirements (page 14).
3.
Upgrade is not reversible; you cannot downgrade to the previous version you had installed.
4.
A new license key is required when upgrading from a major version to another, for example, upgrading from GFI
MailEssentials 2014 to the latest version of GFI MailEssentials.
5.
As from GFI MailEssentials 2015, the Anti-spam synchronization agent feature has been deprecated and is now replaced with the GFI MailEssentials Multi-Server feature. This will need to be reconfigured on upgrade.
For more information, refer to GFI MailEssentials Multi-Server (page 248).
2.4.1 Upgrade procedure
Launch the latest GFI MailEssentials installer on the server where GFI MailEssentials is currently installed. After accepting the End User License Agreement, installer detects existing installation and shows the previous version installation path.
Click Next to upgrade and click Finish on completion.
NOTE
For upgrades on Microsoft
® displays the list of Microsoft ®
Exchange 2007 & over, the Post Installation wizard is displayed after the installation. It
Exchange server roles detected and the GFI MailEssentials components required. Click
Next to install the required GFI MailEssentials components and Finish to complete Post-Install wizard.
2.5 Post-Install actions
To ensure GFI MailEssentials scanning and filtering system is effectively up and running, perform the following postinstall actions:
Action
Add GFI MailEssentials scanning engines to the
Windows DEP Exception
List.
Description
Data Execution Prevention (DEP) is a set of hardware and software technologies that perform memory checks to help prevent malicious code from running on a system.
If you installed GFI MailEssentials on an operating system that includes DEP, you will need to add the
GFI MailEssentials scanning engine (GFiScanM.exe) and the Kaspersky Virus Scanning Engine
(kavss.exe) executables.
NOTE
This is required only when installing on Microsoft ® Windows Server 2003 SP 1 or SP 2.
For more information, refer to Add engines to the Windows DEP Exception List (page 39).
Go to Start > Programs > GFI MailEssentials > GFI MailEssentials Configuration.
Launch GFI MailEssentials
Configuration
Enable Directory Harvesting Directory harvesting attacks occur when spammers try to guess email addresses by attaching well known usernames to your domain. The majority of the email addresses are non-existent. This filter is
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 38
Action
Enable Greylist
Configure Whitelists
Test your installation
Description
The Greylist filter temporarily blocks incoming emails received from unknown senders. Legitimate mail systems typically try to send the email after a few minutes; spammers simply ignore such error
messages. This filter is not enabled by default. For more information, refer to Greylist (page 110).
The Whitelist contains lists of criteria that identify legitimate email. Emails that match these criteria
After configuring all post-install actions, GFI MailEssentials is ready to start protecting and filtering your mail system from malicious and spam emails. Test your installation to ensure that GFI MailEs sentials is working properly.
For more information, refer to Test your installation (page 39).
2.5.1 Add engines to the Windows DEP Exception List
Data Execution Prevention (DEP) is a set of hardware and software technologies that perform memory checks to help prevent malicious code from running on a system.
If you installed GFI MailEssentials on an operating system that includes DEP, you will need to add the GFI MailEssentials scanning engine ( GFiScanM.exe
) and the Kaspersky Virus Scanning Engine ( kavss.exe
) executables.
NOTE
This is required only when installing on Microsoft
®
Windows Server 2003 SP 1 or SP 2.
To add the GFI executables in the DEP exception list:
1. From Control Panel open the System applet.
2. From the Advanced tab, under the Performance area, click Settings .
3. Click Data Execution Prevention tab.
4. Click Turn on DEP for all programs and services except those I select .
5. Click Add and from the dialog box browse to: <GFI MailEssentials installation
path>\GFI\MailEssentials\EmailSecurity , and choose GFiScanM.exe
.
6. Click Add and from the dialog box browse to: <GFI MailEssentials installation
path>\GFI\MailEssentials\AntiVirus\Kaspersky\ , and choose kavss.exe
.
7. Click Apply and OK to apply the changes.
8. Restart the GFI MailEssentials Autoupdater service and the GFI MailEssentials AV Scan Engine services.
2.5.2 Test your installation
After configuring all post-install actions, GFI MailEssentials is ready to start protecting and filtering your mail system from malicious and spam emails.
Ensure that GFI MailEssentials blocks unwanted emails. To do this, send inbound and outbound test emails that are purposely composed in such a way that they are blocked by GFI MailEssentials.
Step 1: Create a Content Filtering rule
1. Launch the GFI MailEssentials console.
2. Go to GFI MailEssentials > Content Filtering > Keyword Filtering node.
3. Click Add Rule… .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 39
Screenshot 19: Creating a test rule on Keyword filtering
4. In Rule name type Test Rule .
5. From the Subject tab, select Block emails if content is found matching these conditions (message subject) .
6. In Edit Condition type Threat test and click Add Condition .
7. From Actions tab, enable Block email and perform this action and select Quarantine email .
8. Click Apply to save the rule.
Step 2: Send an inbound test email
1. From an external email account, create a new email and type Threat test as the subject.
2. Send the email to one of your internal email accounts.
Step 3: Send an outbound test email
1. From an internal email account, create a new email and type Threat test as the subject.
2. Send the email to an external email account.
Step 4: Confirm that test emails are blocked
Verify that both inbound and outbound test emails are blocked and quarantined. To do this:
1. From GFI MailEssentials, go to Quarantine > Today .
2. Ensure that both inbound and outbound test emails are listed in Malware and Content tab, reason being: Triggered rule "Test rule" .
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 40
Screenshot 20: Test email blocked by Test rule
NOTE
When test is completed successfully, delete or disable Test rule created in step 1.
GFI MailEssentials 2 Getting Started with GFI MailEssentials | 41
3 Monitoring status
GFI MailEssentials enables monitoring of your email activity in real time or by generating reports of email activity for a particular time period.
Monitoring module
Dashboard
Description
Reports
The GFI MailEssentials Dashboard provides real time information that enables you to monitor the product. To access the Dashboard, go to GFI MailEssentials > Dashboard. This includes:
Status of GFI MailEssentials services. For more information, refer to Services (page 44).
Graphical presentation of email activity. For more information, refer to Charts (page 45).
List of emails processed. For more information, refer to Email processing logs (page 46).
Record of important GFI MailEssentials events. For more information, refer to Event logs (page 49).
Log of POP2Exchange activities. For more information, refer to POP2Exchange activity (page 50).
GFI MailEssentials enables you to create reports based on data logged to database.
To access Reporting, go to GFI MailEssentials > Reporting.
Enabling reporting - For more information, refer to Enabling/Disabling reporting (page 50).
Generate reports - For more information, refer to Generating a report (page 50).
3.1 Dashboard
The GFI MailEssentials Dashboard provides real time information that enables you to monitor the product. To access the
Dashboard, go to GFI MailEssentials > Dashboard . This includes:
Important statistical information about blocked emails.
For more information, refer to Status and statistics (page
Status of GFI MailEssentials services.
For more information, refer to Services (page 44).
Graphical presentation of email activity.
For more information, refer to Charts (page 45).
List of emails processed.
For more information, refer to Email processing logs (page 46).
Status of software updates.
For more information, refer to Antivirus and anti-spam engine updates (page 48).
Record of important GFI MailEssentials events.
For more information, refer to Event logs (page 49).
Log of POP2Exchange activities.
For more information, refer to POP2Exchange activity (page 50).
GFI MailEssentials 3 Monitoring status | 42
3.1.1 Status and statistics
Screenshot 21: The GFI MailEssentials Dashboard
To open the Dashboard, go to GFI MailEssentials > Dashboard . This page displays statistics, status of services and a graphical presentation of email activity. More details on these sections are provided below.
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Services
Screenshot 22: The GFI MailEssentials Services
The Services area displays the status of GFI MailEssentials services.
- Indicates that the service is started.
- Indicates that the service is stopped. Click this icon to start a stopped service.
You can also start or stop services from the Microsoft ® Windows Services console. To launch the Services console, go to
Start > Run , type services.msc
and click OK .
Quarantine Statistics
Screenshot 23: Quarantine statistics
The Quarantine Statistics area displays the following statistical information:
Statistic title
Quarantined Malware
Emails
Malware Quarantine
Size
Quarantined Spam
Emails
Spam Quarantine Size
Free disk space
Description
Number of emails blocked by Email Security and Content Filtering engines, and stored in the Malware
Quarantine Store.
Size on disk of the Malware Quarantine Store database.
Number of emails blocked by anti-spam engines and stored in the Spam Quarantine Store.
Size on disk of the Spam Quarantine Store database.
Free space on the disk where quarantine stores are saved.
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Charts
Screenshot 24: Dashboard charts
The Charts area displays graphical information about emails processed by GFI MailEssentials. Select the time period from the drop-down list to display information for that period in the charts.
Area
View charts for
Email scanning
timeline (time graph)
Scan statistics (pie chart)
Legend
Description
Enables you to select a period for which to view charts. Available options are:
Last 6 hours
Last 24 hours
Last 48 hours
Last 7 days
Shows a time graph in intervals for the time period selected. The graph shows the number of processed, legitimate, malware, content filtering and spam emails.
A graphical distribution of the total number of safe, quarantined and failed emails for the time period selected.
The legend shows the color used in graphs and the count of each category.
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3.1.2 Email processing logs
Screenshot 25: Email processing logs
From GFI MailEssentials Configuration, you can monitor all processed emails in real time. Navigate to GFI MailEssentials >
Dashboard and select the Logs tab to display the list of processed emails. The following details are displayed for each email processed:
Date/Time
Sender
Recipient(s)
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Subject
Scan Result - shows the action taken on the email.
Action
OK
Quarantined
Description
Email is not blocked by GFI MailEssentials, and is delivered to its intended recipients.
Email is blocked by an engine or a filter that has the action set to Quarantine. Click Quarantine to review the email.
NOTE
The email cannot be previewed in quarantine if it was manually deleted from quarantine.
Blocked
Deleted
Failed
Email is blocked by an engine or filter. Action taken is as configured for that particular engine.
Email is blocked by an engine or filter with the action set to delete detected emails.
Email that could not be scanned by GFI MailEssentials. Email is moved to one of the following folder:
<GFI MailEssentials installation
path>\GFI\MailEssentials\EmailSecurity\FailedMails\
<GFI MailEssentials installation path>\GFI\MailEssentials\AntiSpam\FailedMails\
For more information, refer to Failed emails (page 225).
Filtering the email processing logs
Screenshot 26: Email processing logs filter
Filtering the email processing logs simplifies the reviewing process by providing the possibility to find particular emails.
From the Filter area, specify any of the following criteria:
Filter
Sender
Recipient
Description
Specify the full or part of an email address to display only the emails sent by matching senders.
Specify the full or part of an email address to display only the emails sent to matching recipients.
Subject Specify the full or part of an email subject to display only the emails with a matching subject.
Scan result From the drop-down list, select whether to display only emails with a particular scan result (for example, quarantined emails only)
From & To
Modules
Specify a date and time range to display emails processed during that particular period.
Show only emails that were blocked by particular engines or filters.
NOTE
Click Clear Filters to remove specified filters and to show all email logs.
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3.1.3 Antivirus and anti-spam engine updates
Screenshot 27: Virus scanning engines updates
The updates of antivirus and antispam scanning engines can be monitored from a central page. Go to GFI MailEssentials
> Dashboard and select the Updates tab to review the status and dates when scanning engines were last updated.
Click Update all engines to check for, and download, all updates.
The updates are checked for, and downloaded, as configured in the engines' configuration pages. Go to the configuration page of each engine and navigate to the Updates tab to configure update settings.
NOTE
Updates for each engine are checked for and downloaded sequentially (one engine update at a time).
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3.1.4 Event logs
Screenshot 28: Event logs
From GFI MailEssentials Configuration, you can monitor important events related to the functionality of GFI MailEssentials.
Examples of instances that trigger events: completion of anti-spam engine updates reporting database reaches 1.7GB and GFI MailEssentials rolls over to a new database less than 1GB free disk space on partition where quarantine is stored
Navigate to GFI MailEssentials > Dashboard information is displayed for each event: and select the Events tab to display the list of events. The following
Date/Time
Event ID - an identifier is assigned to each type of GFI MailEssentials event.
Subject
Click Details to show more information about a particular event.
GFI MailEssentials events are also available from the Windows Event Viewer under Applications and Services Logs > GFI
MailEssentials .
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3.1.5 POP2Exchange activity
Screenshot 29: POP2Exchange log
From GFI MailEssentials, you can monitor the activity of POP2Exchange in real time. Navigate to GFI MailEssentials >
Dashboard and select the POP2Exchange tab.
NOTE
POP2Exchange is configurable from the Email Management Tools console.
For more information, refer to
POP2Exchange - Download emails from POP3 server (page 228).
3.2 Reports
GFI MailEssentials enables you to create reports based on data logged to database.
To access Reporting, go to GFI MailEssentials > Reporting .
Enabling reporting -
For more information, refer to Enabling/Disabling reporting (page 50).
Configure reporting database -
For more information, refer to Configuring reporting database (page 56).
Generate reports -
For more information, refer to Generating a report (page 50).
Custom reports - Save custom report parameters and generate on a schedule.
For more information, refer to Cus tom reports (page 54).
Search the reporting database -
For more information, refer to Searching the reporting database (page 55).
3.2.1 Enabling/Disabling reporting
By default, Reporting is enabled and email activity data is logged to a Firebird database (.fdb) located in folder:
<GFI MailEssentials installation path> \GFI\MailEssentials\data\
Go to Reporting > Settings node and check or uncheck Enable Reporting to enable or disable reporting respectively.
3.2.2 Generating a report
1. From GFI MailEssentials configuration, go to GFI MailEssentials > Reporting > Reports .
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Screenshot 30: Creating a report
2. From the Report List tab, configure the following report options:
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Option
Select report to generate:
Date filtering
Email direction filtering
Email address filtering
Report Group ing
Description
Select the type of report to generate:
Email Direction - shows total emails processed for each email direction - Inbound, Outbound and Internal.
Email Direction Chart - graphically shows total emails processed for each email direction - Inbound, Out bound and Internal.
Emails Blocked - shows total emails blocked by anti-spam and anti-malware filters for each email direction
(Inbound, Outbound and Internal) out of all emails processed.
Emails Blocked Graph - graphically shows total emails blocked by anti-spam and anti-malware filters for each email direction (Inbound, Outbound and Internal) out of all emails processed.
Spam Filter - shows the total number of emails blocked by each anti-spam filter.
Spam Filter Graph - graphically shows the total number of emails blocked by each anti-spam filter.
User Report - shows the number of blocked and allowed emails for each email address.
User Report (Active Users) - shows the number of blocked and allowed emails for email addresses that were active during the selected report period.
Click View Report Preview to preview how report looks like.
Select report date range.
When selecting Custom date range, specify the period to display data for, from the Custom from date and
Custom to date calendar controls.
Select a particular email direction to display data for or select All email directions (inbound, outbound, internal) to display data for all directions.
Key in an email address to display report information for that particular email address only.
Specify how to group data. Available options are:
Group by Day
Group by Week
Group by Month
Group by Year
3. Click Generate to build and display the report or Save as Custom to save report settings for reuse at a later time.
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Screenshot 31: Emails blocked graph report
Report functions
Use the report top toolbar to do the following functions:
Function
Icon
Print current page
Navigate
Save
Description
Click to print report.
Click to print the page that is currently displayed.
Use this toolbar to navigate through report pages.
Select format to save report in and click Save. Specify location where to save report.
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3.2.3 Custom reports
Custom reports enable you to save specific report parameters (for example, a report type for a specific time/date period)
and to have it generated on a schedule. Use this feature to automate report generation.
Creating new custom reports
1.
From GFI MailEssentials configuration, go to GFI MailEssentials > Reporting > Reports .
2.
Select Custom Reports tab and click New .
3.
In Report Name , key in a friendly name for the report.
4.
Configure the following options:
Option
Select report to generate:
Date filtering
Email direction filtering
Email address filtering
Report Group ing
Description
Select the type of report to generate:
Email Direction - shows total emails processed for each email direction - Inbound, Outbound and Internal.
Email Direction Chart - graphically shows total emails processed for each email direction - Inbound, Out bound and Internal.
Emails Blocked - shows total emails blocked by anti-spam and anti-malware filters for each email direction
(Inbound, Outbound and Internal) out of all emails processed.
Emails Blocked Graph - graphically shows total emails blocked by anti-spam and anti-malware filters for each email direction (Inbound, Outbound and Internal) out of all emails processed.
Spam Filter - shows the total number of emails blocked by each anti-spam filter.
Spam Filter Graph - graphically shows the total number of emails blocked by each anti-spam filter.
User Report - shows the number of blocked and allowed emails for each email address.
User Report (Active Users) - shows the number of blocked and allowed emails for email addresses that were active during the selected report period.
Click View Report Preview to preview how report looks like.
Select report date range.
When selecting Custom date range, specify the period to display data for, from the Custom from date and
Custom to date calendar controls.
Select a particular email direction to display data for or select All email directions (inbound, outbound, internal) to display data for all directions.
Key in an email address to display report information for that particular email address only.
Specify how to group data. Available options are:
Group by Day
Group by Week
Group by Month
Group by Year
5.
Optionally, enable Send every checkbox and configure a date/time combination to have the report generated at a specific date and time. Click Add Rule to save report generation time.
NOTE
To delete a rule, select an existing report generation time and click Delete .
6.
Select whether to send report by email or save it to disk. To send report by email, select Send by email and provide the email address to where the email is sent. To save report to disk, select Save to Disk and provide a location where file will be saved. Select the format of the report in the File Type box.
7.
Click Save to save newly created report.
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3.2.4 Generating custom reports
To generate a custom report:
1.
From GFI MailEssentials configuration, go to GFI MailEssentials > Reporting > Reports .
2.
From the Custom Reports tab, select a report to generate.
3.
Click Generate .
3.2.5 Deleting custom reports
To delete a custom report:
1.
From GFI MailEssentials configuration, go to GFI MailEssentials > Reporting > Reports .
2.
From the Custom Reports tab, select a report to delete.
3.
Click Delete .
3.2.6 Searching the reporting database
GFI MailEssentials stores some properties of all emails processed in the reporting database. GFI MailEssentials enables you to search the reporting database, to find processed emails. To search the reporting database:
1. From GFI MailEssentials Configuration, go to GFI MailEssentials > Reporting > Search .
Screenshot 32: Searching the reporting database
2. Specify search criteria:
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Search criteria
Start date & End date
User
Description
Select date range to filter emails from that period. Click Search.
Filter email address results. Key in number and click to specify conditions.
Total emails
Filter users by the amount of emails processed. Key in number and click to specify conditions.
3. The list of matching users is displayed. Click an email address to view detailed report of emails processed for that email address.
Screenshot 33: Reports database search results
4. (Optional) From the report, filter the data by email direction, sender, recipient or subject.
5. To export the report to another format, select format and click Export .
3.2.7 Configuring reporting database
By default, GFI MailEssentials uses a Firebird database reports.fdb
located in:
<GFI MailEssentials installation path> \GFI\MailEssentials\data\
You can also use a Microsoft
®
SQL Server database for reports.
Configuring a Firebird database backend
Configuring a Microsoft ® SQL Server database backend
Configuring database auto-purging
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Configuring a Firebird database backend
Screenshot 34: Configuring a Firebird database backend
1. Navigate to Reporting > Settings .
2. From the Database Type box, select Firebird .
3. Key in the complete path including file name and .fdb extension of the database file. If you only specify a file name, the database file is created in the following default path:
<GFI MailEssentials installation path> \GFI\MailEssentials\data\
4. Click Apply .
NOTE
An email notification is sent to the administrator when the database reaches 7GB since this may impact performance. If this is the case it is recommended to use
to remove emails older than a particular date.
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Configuring a Microsoft
®
SQL Server database backend
1.
Create a new database in Microsoft
®
SQL Server.
2.
Create a dedicated user/login in Microsoft ® SQL Server, mapped to the newly created database. Grant the user full access to all server and database roles and permissions.
3.
In GFI MailEssentials navigate to Reporting > Settings .
Screenshot 35: Configuring SQL Server Database backend
4.
From the Database Type box, select SQL Server .
5.
Select Detected server to select an automatically detected SQL Server from the list. If the server is not detected, select
Manually specified server and key in the Microsoft ® SQL Server host name or IP address.
6.
Key in the credentials with permissions to read/write to the database.
7.
Click Get Database List to extract the list of databases from the server.
8.
From the Database list, select the database created for GFI MailEssentials Reporting.
9.
Click Apply .
Configuring database auto-purging
You can configure GFI MailEssentials to automatically delete (auto-purge) records from the database that are older than a particular period.
By default Auto-Purging is configured to delete data older than 12 months.
To enable auto-purging:
1. Navigate to Reporting > Settings and select Auto-purge tab.
2. Select Enable Auto-Purging and specify how long items in database should be stored in months .
3. Click Apply .
NOTE
Auto-purging is applied only to the current database configured in the Reporting tab.
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3.2.8 MailInsights
®
report
MailInsights
® is a reporting facility that uses the data in the reporting database to deliver information related to email usage and trends.
GFI MailEssentials provides the Communication Flow report which gives a graphical presentation of emails exchanged between selected users/groups and their contacts. Other MailInsights ® reports can be generated using GFI
MailArchiver .
Communication Flow report
The Communication Flow report shows the top 20 contacts that a user communicated with in the previous 30 days.
1.
Navigate to Reporting > MailInsights and select the Communication Flow tab.
2.
Administrators can generate the report for any email user. Click Search to select an email user and click Generate to start building the report.
The generated report displays the data for the selected user as follows:
Totals
Graph
Top 20 contacts
The top area of the report shows the total statistics of communication flow in the previous 30 days.
Total Contacts - the total number of email addresses with whom the user had email communications.
Total Internal - total number of internal users with whom the user had communications.
Top Internal - the internal email address with whom the selected user communicated the most.
Total External - total number of external users with whom the user had communications.
Top External - the external email address with whom the selected user communicated the most.
The selected user is displayed as a single entity in the middle of the graph. Contacts are segregated by domains. Each domain cluster is shown in different color. Edge width between the nodes shows the strength of the email relation between different entities.
The top 20 contacts with whom the selected user communicated the most. Color codes indicate the different contacts' domains. The table indicates the total number of sent & received emails with that contact, together with the date and time when the last email communication occurred.
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Screenshot 36: MailInsights
®
Communication Flow report
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4 Email Security
The security filters of GFI MailEssentials offer protection against virus-infected and other malicious emails.
Topics in this chapter:
4.2 Information Store Protection
4.3 Trojan and Executable Scanner
4.1 Virus Scanning Engines
GFI MailEssentials uses multiple antivirus engines to scan inbound, outbound and internal emails for the presence of viruses. GFI MailEssentials ships with Vipre and BitDefender Virus Scanning Engines. You can also acquire a license for
Kaspersky, Avira & Intel Security.
This chapter describes how to configure Virus Scanning Engines, updates, actions and the scanning sequence.
4.1.1 Vipre
1.
Go to Email Security > Virus Scanning Engines > Vipre .
Screenshot 37: Vipre configuration
2.
Select Enable Gateway Scanning (SMTP) check box, to scan emails using this Virus Scanning Engine.
3.
Select whether to scan inbound and/or outbound emails using this Virus Scanning Engine.
Option
Scan Inbound SMTP email
Scan Outbound SMTP email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
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4.
When Information Store Protection is enabled, you will also have the option to scan internal emails and the Inform ation Store. Select Scan Internal and Information Store Items .
For more information, refer to Information Store Pro tection (page 77).
NOTE
In this page you can also review the antivirus engine licensing and version information.
Screenshot 38: Virus scanning engine actions
5.
From Actions tab, choose the action to take when an email is blocked:
Action
Quarantine item
Delete item
Send a sanitized copy of the original email to recipient(s)
Description
Stores all infected emails detected by the selected Virus Scanning Engine in the Quarantine Store. You
can subsequently review (approve/delete) all the quarantined emails. For more information, refer to
Deletes infected emails.
When this option is enabled, GFI MailEssentials removes malicious content from emails and attaches a text file indicating that the email contained malicious content. The email is then forwarded to its inten ded recipients.
6.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
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Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
7.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Screenshot 39: Engine Updates tab
8.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
9.
From Downloading option list, select one of the following options:
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Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
10.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
11.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
12.
To check for and download updates immediately, click Download updates .
13.
Click Apply .
4.1.2 BitDefender
1.
Go to Email Security > Virus Scanning Engines > BitDefender .
Screenshot 40: BitDefender configuration
2.
Select Enable Gateway Scanning (SMTP) check box, to scan emails using this Virus Scanning Engine.
3.
Select whether to scan inbound and/or outbound emails using this Virus Scanning Engine.
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Option
Scan Inbound SMTP email
Scan Outbound SMTP email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
4.
When Information Store Protection is enabled, you will also have the option to scan internal emails and the Inform ation Store. Select Scan Internal and Information Store Items .
For more information, refer to Information Store Pro tection (page 77).
NOTE
In this page you can also review the antivirus engine licensing and version information.
5.
BitDefender can also be used to block emails with attachments that contain macros. Enable this feature from the
Macro Checking area by selecting Block all documents containing macros .
NOTE
If Macro Checking is disabled, GFI MailEssentials still scans for and blocks Macro Viruses.
Screenshot 41: Virus scanning engine actions
6.
From Actions tab, choose the action to take when an email is blocked:
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Action
Quarantine item
Delete item
Send a sanitized copy of the original email to recipient(s)
Description
Stores all infected emails detected by the selected Virus Scanning Engine in the Quarantine Store. You
can subsequently review (approve/delete) all the quarantined emails. For more information, refer to
Deletes infected emails.
When this option is enabled, GFI MailEssentials removes malicious content from emails and attaches a text file indicating that the email contained malicious content. The email is then forwarded to its inten ded recipients.
7.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
8.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
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Screenshot 42: Engine Updates tab
9.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
10.
From Downloading option list, select one of the following options:
Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
11.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
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12.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
13.
To check for and download updates immediately, click Download updates .
14.
Click Apply .
4.1.3 Kaspersky
1.
Go to Email Security > Virus Scanning Engines > Kaspersky .
Screenshot 43: Kaspersky configuration
2.
Select Enable Gateway Scanning (SMTP) check box, to scan emails using this Virus Scanning Engine.
3.
Select whether to scan inbound and/or outbound emails using this Virus Scanning Engine.
Option
Scan Inbound SMTP email
Scan Outbound SMTP email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
4.
When Information Store Protection is enabled, you will also have the option to scan internal emails and the Inform ation Store. Select Scan Internal and Information Store Items .
For more information, refer to Information Store Pro tection (page 77).
NOTE
In this page you can also review the antivirus engine licensing and version information.
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Screenshot 44: Virus scanning engine actions
5.
From Actions tab, choose the action to take when an email is blocked:
Action
Quarantine item
Delete item
Send a sanitized copy of the original email to recipient(s)
Description
Stores all infected emails detected by the selected Virus Scanning Engine in the Quarantine Store. You
can subsequently review (approve/delete) all the quarantined emails. For more information, refer to
Deletes infected emails.
When this option is enabled, GFI MailEssentials removes malicious content from emails and attaches a text file indicating that the email contained malicious content. The email is then forwarded to its inten ded recipients.
6.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
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7.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Screenshot 45: Engine Updates tab
8.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
9.
From Downloading option list, select one of the following options:
Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
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10.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
11.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
12.
To check for and download updates immediately, click Download updates .
13.
Click Apply .
4.1.4 Avira
1.
Go to Email Security > Virus Scanning Engines > Avira .
Screenshot 46: Avira configuration
2.
Select Enable Gateway Scanning (SMTP) check box, to scan emails using this Virus Scanning Engine.
3.
Select whether to scan inbound and/or outbound emails using this Virus Scanning Engine.
Option
Scan Inbound SMTP email
Scan Outbound SMTP email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
4.
When Information Store Protection is enabled, you will also have the option to scan internal emails and the Inform ation Store. Select Scan Internal and Information Store Items .
For more information, refer to Information Store Pro tection (page 77).
NOTE
In this page you can also review the antivirus engine licensing and version information.
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Screenshot 47: Virus scanning engine actions
5.
From Actions tab, choose the action to take when an email is blocked:
Action
Quarantine item
Delete item
Send a sanitized copy of the original email to recipient(s)
Description
Stores all infected emails detected by the selected Virus Scanning Engine in the Quarantine Store. You
can subsequently review (approve/delete) all the quarantined emails. For more information, refer to
Deletes infected emails.
When this option is enabled, GFI MailEssentials removes malicious content from emails and attaches a text file indicating that the email contained malicious content. The email is then forwarded to its inten ded recipients.
6.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
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7.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Screenshot 48: Engine Updates tab
8.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
9.
From Downloading option list, select one of the following options:
Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
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10.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
11.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
12.
To check for and download updates immediately, click Download updates .
13.
Click Apply .
4.1.5 Intel Security
1.
Go to Email Security > Virus Scanning Engines > Intel Security .
Screenshot 49: Intel Security configuration
2.
Select Enable Gateway Scanning (SMTP) check box, to scan emails using this Virus Scanning Engine.
3.
Select whether to scan inbound and/or outbound emails using this Virus Scanning Engine.
Option
Scan Inbound SMTP email
Scan Outbound SMTP email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
4.
When Information Store Protection is enabled, you will also have the option to scan internal emails and the Inform ation Store. Select Scan Internal and Information Store Items .
For more information, refer to Information Store Pro tection (page 77).
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NOTE
In this page you can also review the antivirus engine licensing and version information.
5.
Intel Security Antivirus can also be used to block emails with attachments that contain macros. Enable this feature from the Macro Checking area by selecting Block all documents containing macros .
Screenshot 50: Virus scanning engine actions
6.
From Actions tab, choose the action to take when an email is blocked:
Action
Quarantine item
Delete item
Send a sanitized copy of the original email to recipient(s)
Description
Stores all infected emails detected by the selected Virus Scanning Engine in the Quarantine Store. You
can subsequently review (approve/delete) all the quarantined emails. For more information, refer to
Deletes infected emails.
When this option is enabled, GFI MailEssentials removes malicious content from emails and attaches a text file indicating that the email contained malicious content. The email is then forwarded to its inten ded recipients.
7.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
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Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
8.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Screenshot 51: Engine Updates tab
9.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
10.
From Downloading option list, select one of the following options:
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Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
11.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
12.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
13.
To check for and download updates immediately, click Download updates .
14.
Click Apply .
4.2 Information Store Protection
Use the Virus Scanning Engines to scan the Microsoft ® Exchange mailbox databases and public folders for viruses.
GFI MailEssentials can scan the Microsoft Exchange Information Store using two different protocols:
Protocol
Exchange Web
Services (EWS)
Virus Scan API
(VSAPI)
Exchange versions Description
2007 SP1
2010
2013
2016
Information Store protection via Exchange Web Services retrieves email attachments from the Information Store via a predefined schedule. Attachments are then scanned by the Virus
Scanning Engines and if malware is found, the attachment is removed from the email in the mailbox.
GFI MailEssentials does not have to be installed on the Microsoft Exchange server to use
EWS.
NOTES:
EWS may impact system performance so it is recommended to schedule scanning dur ing off-peak hours.
Unlike VSAPI, email attachments are scanned after these are stored in the mailbox so malicious attachments are not filtered from the Information Store until scan starts.
2003
2007 SP1
2010
VSAPI scans emails before these are stored in the Information Store, ensuring that malware is filtered out immediately before reaching the Information Store.
VSAPI requires that GFI MailEssentials is installed on the Microsoft Exchange server. On a
Microsoft ® Exchange Server 2007/2010 machine, the Mailbox Server Role and Hub Transport
Server Role are required.
NOTE: GFI MailEssentials cannot scan the Information Store if any other software is registered to use the Microsoft
®
Exchange VSAPI.
NOTE
Information Store Protection is only available when GFI MailEssentials is installed in Active Directory or Remote Active
Directory modes. It is not available in SMTP mode.
To enable Information Store Scanning and configure the scanning protocol:
1.
Go to Email Security > Information Store Protection .
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Screenshot 52: Information Store Protection node when both EWS & VSAPI are available
2.
From Information Store Virus Scanning tab, select Enable Information Store Virus Scanning .
3.
When GFI MailEssentials is installed on Microsoft Exchange 2007 SP1 or 2010 with Mailbox Server and Hub Transport
Server Roles, choose the protocol to use for scanning the Information Store VSAPI or Exchange Web Services .
4.
In the other tabs, configure the protocol options. Refer to
or
Exchange Web Servies (EWS) Settings
5.
Click Apply .
The status of the Virus Scanning Engines used to scan the Information Store is displayed in the table.
To disable a particular antivirus engine from Information Store Scanning, navigate to the Virus Scanning Engines page, select the antivirus engine and disable Scan Internal and Information Store Items .
4.2.1 Exchange Web Services (EWS) Settings
1.
Go to the EWS Settings tab.
2.
Configure the settings used to connect to Microsoft Exchange. EWS uses the Exchange account configured in the
Switchboard to connect to the Information Store.
For more information, refer to Set a Microsoft® Exchange account
Option
Microsoft Exchange
Server URL
Test
Description
Choose Auto-Discovery to allow GFI MailEssentials to automatically find your Microsoft Exchange server. If
Exchange is not discoverable, choose Manual to key in the Exchange Web Services (EWS) URL manually. The
URL is usually composed in the following syntax: https://<Exchange Hostname>/EWS/Exchange.asmx
NOTE: The Exchange Web Services (EWS) URL can also be retrieved by running this command in Exchange
Management Shell:
Get-WebServicesVirtualDirectory |Select name, *url* | fl
Click to ensure that GFI MailEssentials can connect to the Microsoft Exchange Information Store using the provided details.
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Option
Scan Public
Folders
Simultaneous mail box scans
Description
Select to also scan items in Public Folders.
Define the number of mailboxes to scan at the same time. The default number of simultaneous mailboxes is 1.
Defining a higher number uses more system resources for scanning, but more items can get scanned in a shorter time.
3.
In the Scanning Schedule area, define a schedule when to run Information Store Scanning. When the schedule is on, GFI MailEssentials goes through items that were not scanned in each mailbox. On scanning all new items in a mail box, it starts scanning the next mailbox. When all mailboxes are scanned, it restarts scanning new items in the first mail box again and repeats the process until the schedule is turned off. Choose the type of schedule to run:
Continuous scanning - Run Information Store Protection via EWS without pause.
Timed interval - Run scans in a defined schedule. Choose Daily to run scan everyday or On the following day(s) to run scan on selected days only. Define the time when to run the scan and the duration of the scan in hours.
NOTE
Scanning via EWS can be time consuming and uses considerable system resources, so it is recommended to run scans during off-peak hours only.
4.
In the Excluded Mailboxes area, add any mailboxes which you do not want the Information Store Protection to scan.
5.
Click Apply .
4.2.2 VSAPI Settings
1.
Go to the VSAPI Settings tab.
2.
(Optional) Select Enable background scanning to run Information Store Scanning in the background.
WARNING
Background scanning causes all the contents of the Information Store to be scanned. This can result in a high processing load on the Microsoft
®
Exchange server depending on the amount of items stored in the Information
Store. It is recommended to enable this option only during periods of low server activity such as during the night.
3.
Select a VSAPI scan method:
Description Scan
Method
Onaccess scanning
Pro-act ive scan ning
New items in the Information Store are scanned as soon as they are accessed by the email client. This introduces a short delay before the email client displays the contents of a new message.
New items added to the Information Store are added to a queue for scanning. This is the default and recommended mode of operation, since in general the delay associated with on-access scanning is avoided.
NOTE
In the event that an email client tries to access an item that is still in the queue, it will be allocated a higher scanning priority so that it is scanned immediately.
4.
Click Apply .
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4.3 Trojan and Executable Scanner
The Trojan and Executable Scanner analyzes and determines the function of executable files attached to emails. This scanner can subsequently quarantine any executables that perform suspicious activities (such as Trojans).
How does the Trojan & Executable Scanner work?
GFI MailEssentials rates the risk-level of an executable file by decompiling the executable, and detecting in real-time what the executable might do. Subsequently, it compares capabilities of the executable to a database of malicious actions and rates the risk level of the file. With the Trojan & Executable scanner, you can detect and block potentially dangerous, unknown or one-off Trojans before they compromise your network.
4.3.1 Configuring the Trojan & Executable Scanner
1.
Go to Email Security > Trojan & Executable Scanner .
Screenshot 53: Trojan and Executable Scanner: General Tab
2.
Select Enable Trojan & Executable Scanner to activate this filter.
3.
In Email checking area, specify the emails to check for Trojans and other malicious executables by selecting:
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Option
Scan Inbound SMTP Email
Scan Outbound SMTP Email
Description
Scan incoming emails for Trojans and malicious executable files.
Scan outgoing emails for Trojans and malicious executable files.
4.
From the Security settings area, choose the required level of security:
Description Security
Level
High Secur ity
Medium
Security
Low Secur ity
Blocks all executables that contain any known malicious signatures
Blocks suspicious executables. Emails are blocked if an executable contains one high-risk signature or a combination of high-risk and low-risk signatures.
Blocks only malicious executables. Emails are blocked if an executable contains at least one high-risk signature.
5.
From Actions tab, configure the actions you want GFI MailEssentials to take on emails containing a malicious execut able.
NOTE
Emails blocked by the Trojan & Executable Scanner are always quarantined.
NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
6.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
7.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
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Screenshot 54: Engine Updates tab
8.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
9.
From Downloading option list, select one of the following options:
Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
10.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
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11.
From Update options area, select Enable email notifications upon successful updates to send an email noti fication to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
12.
To check for and download updates immediately, click Download updates .
13.
Click Apply .
4.4 Email Exploit Engine
The Email Exploit Engine blocks exploits embedded in an email that can execute on the recipient’s machine either when the user receives or opens the email. An exploit uses known vulnerabilities in applications or operating systems to compromise the security of a system. For example, execute a program or command, or install a backdoor.
4.4.1 Configuring the Email Exploit Engine
1.
Go to Email Security > Email Exploit Engine .
Screenshot 55: Email Exploit configuration
2.
From the General tab, select whether to scan inbound and/or outbound emails.
Option
Scan inbound SMTP emails
Scan outbound SMTP emails
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
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Screenshot 56: Email Exploit Actions
3.
From Actions tab, choose the action to take when an email is blocked:
Action
Quarantine email
Delete email
Description
Stores all infected emails detected by the Email Exploit Engine in the Quarantine Store. You can subsequently review
Deletes infected emails.
4.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
5.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
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Screenshot 57: Engine Updates tab
6.
From Updates tab, select Automatically check for updates to enable automatic updating for the selected engine.
7.
From Downloading option list, select one of the following options:
Option
Only check for updates
Check for updates and download
Description
Select this option if you want GFI MailEssentials to just check for and notify the administrator when updates are available for this engine. This option will NOT download the available updates automatically.
Select this option if you want GFI MailEssentials to check for and automatically download any updates available for this engine.
8.
Specify how often you want GFI MailEssentials to check/download updates for this engine, by specifying an interval value in hours.
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9.
From Update options area, select Enable email notifications upon successful updates to send an email notification to the administrator whenever the engine updates successfully.
NOTE
An email notification is always sent when an update fails.
10.
To check for and download updates immediately, click Download updates .
11.
Click Apply .
4.4.2 Enabling/Disabling Email Exploits
1.
Go to Email Security > Email Exploit Engine > Exploit List
Screenshot 58: Email Exploit List
2.
Select the check box of the exploit(s) to enable or disable.
3.
Click Enable Selected or Disable Selected accordingly.
4.5 HTML Sanitizer
The HTML Sanitizer scans and removes scripting code within the email body and attachments.It scans:
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the email body of emails that have the MIME type set to “text/html” all attachments of type .htm
or .html
.
4.5.1 Configuring the HTML Sanitizer
1.
Go to Email Security > HTML Sanitizer .
Screenshot 59: HTML Sanitizer configuration page
2.
Enable the HTML Sanitizer by selecting Enable the HTML Sanitizer checkbox .
3.
Select direction of emails:
Option
Scan inbound SMTP emails
Scan outbound SMTP emails
Description
Scan and sanitize HTML scripts from all incoming emails.
Scan and sanitize HTML scripts from all outgoing emails.
4.
Click Apply .
4.5.2 HTML Sanitizer Whitelist
The HTML Sanitizer Whitelist can be configured to exclude emails received from specific senders.
NOTE
To exclude specific IP Addresses or domains, use the HTML Sanitizer Domain\IP Exclusions feature.
For more information, refer to HTML Santizer Domain\IP Exclusions (page 88).
To manage senders in the HTML Sanitizer Whitelist:
1.
Navigate to Email Security > HTML Sanitizer and select Whitelist tab.
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Screenshot 60: HTML Sanitizer Whitelist page
2.
In Whitelist entry , key in an email address, an email domain (for example, *@domain.com) or an email sub-domain (for example, *@*.domain.com) and click Add .
NOTE
To remove an entry from the HTML Sanitizer whitelist, select an entry and click Remove .
3.
Click Apply .
4.5.3 HTML Santizer Domain\IP Exclusions
The HTML Santizer Domain\IP Exclusions feature enables administrators to specify IP addresses or domains to exclude from HTML Sanitizer. This will not simply use an IP address list; it can also support domain addresses, which are then resolved at runtime, so that all the IP addresses for the domain in question are obtained. This is done in two ways:
1.
By default, the feature queries the MX records of the domain being processed
2.
Optionally, you can choose to have the SPF record of the domain queried. If the domain doesn’t have an SPF record, the SPF part is ignored and only the MX records are used.
If the IP address from where the email originated (the one which sent to the perimeter server) is an IP listed in the
Domains\IPs exclusions tab or resolved from a domain in the same list, then the email is not processed by HTML Sanitizer.
The exclusion list also accepts domains, resolves the domains’ MX records and (optionally) checks the SPF record to get IP addresses.
To manage domains\IP exclusions in the HTML Sanitizer Whitelist:
1.
Navigate to Email Security > HTML Sanitizer and select Domains\IP exclusions tab.
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Screenshot 61: Domain\IP Exclusions
2.
Key in the domain or IP address to exclude and click Add .
NOTE
To remove an entry from the HTML Sanitizer Domain\IP Exclusions, select an entry and click Remove .
3.
Optionally, select Query the SPF records of the specified domains for the list of the servers to exclude .
4.
Click Apply .
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5 Anti-Spam
The anti-spam filters included with GFI MailEssentials help detect and block unwanted emails (spam).
Topics in this chapter:
5.2 Spam Actions - What to do with spam emails
5.3 Sorting anti-spam filters by priority
5.4 SMTP Transmission Filtering
5.7 SpamTag for Microsoft Outlook
5.1 Anti-Spam filters
GFI MailEssentials uses various scanning filters to identify spam:
FILTER
DESCRIPTION
An anti-spam engine that determines if an email is spam by using email repu tation, message fingerprinting and content analysis.
Blocks emails that contain links in the message body pointing to known phishing sites or if they contain typical phishing keywords.
Directory harvesting attacks occur when spammers try to guess email addresses by attaching well known usernames to your domain. The majority of the email addresses are non-existent.
ENABLED BY DEFAULT
Yes
Yes
The Email Blocklist is a custom database of email addresses and domains from which you never want to receive emails.
The IP Blocklist is a custom database of IP addresses from which you never want to receive emails.
IP DNS Blocklist checks the IP address of the sending mail server against a public list of mail servers known to send spam.
Stops emails that contain links to domains listed on public Spam URI Blocklists.
This filter uses SPF records to stop email sent from forged IP addresses by identi fying if the sender IP address is authorized.
Checks emails received with a sender email address claiming to originate from your own domain against a list of IP addresses by GFI MailEssentials. If the sender
IP address is not on the list of own-domain server IP addresses, email is blocked.
The Greylist filter temporarily blocks incoming emails received from unknown senders. Legitimate mail systems typically try to send the email after a few minutes; spammers simply ignore such error messages.
Yes (only if GFI MailEs sentials is installed in an
Active Directory envir onment)
Yes
No
Yes
Yes
No
No
No
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FILTER
DESCRIPTION
Determines the language of the email body text and configurable to block cer tain languages.
The Header Checking filter analyses the email header to identify spam emails.
This filter enables the identification of Spam based on keywords in the email being received.
An anti-spam filter that can be trained to accurately determine if an email is spam based on past experience.
The Whitelist contains lists of criteria that identify legitimate email. Emails that match these criteria are not scanned by anti-spam filters and are always delivered to the recipient.
The New Senders filter identifies emails that have been received from senders to whom emails have never been sent before.
ENABLED BY DEFAULT
No
No
No
No
Yes
No
5.1.1 SpamRazer
An anti-spam engine that determines if an email is spam by using email reputation, message fingerprinting and content analysis. SpamRazer is the primary anti-spam engine and is enabled by default on installation. Frequent updates are released for SpamRazer that will further decrease the response time to new trends of spam.
SpamRazer also includes Sender Policy Framework filtering which detects forged senders. It is recommended that senders publish their mail server in an SPF record. For more information on SPF and how it works, visit the Sender Policy
Framework website at: http://www.openspf.org
.
This filter also blocks NDR spam. For more information on NDR spam refer to http://go.gfi.com/?pageid=ME_NDRSpam
Configuring SpamRazer
NOTES
1.
Disabling SpamRazer is NOT recommended.
2.
GFI MailEssentials downloads SpamRazer updates from: *.mailshell.net
1.
Go to Anti-Spam > Anti-Spam Filters > SpamRazer .
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Screenshot 62: SpamRazer Properties
2.
From the General tab perform any of the following actions:
Option
Enable SpamRazer engine
Enable SpamRazer SPF
(Recommended)
Description
Enable or disable SpamRazer.
Enable or disable Sender Policy Framework. It is recommended to enable this option and to have this filter running after the Email Whitelist.
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Screenshot 63: SpamRazer Updates tab
3.
From the Updates tab, perform any of the following actions:
Option
Automatically check for updates
Description
Configure GFI MailEssentials to automatically check for and download any SpamRazer updates. Specify the time interval in minutes when to check for spam detection rule and SpamRazer engine updates.
NOTE
It is recommended to enable this option for SpamRazer to be more effective in detecting the latest spam trends.
Enable email noti fications upon successful updates
Enable email noti fications upon failed updates
Select this option to be informed via email when new updates are downloaded.
Select this option to be informed via email when a download or installation fails.
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Option
Download updates now…
Description
Click to download updates.
NOTE
You can download updates using a proxy server.
For more information, refer to Proxy settings (page 210).
4.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
5.
Click Apply .
5.1.2 Anti-Phishing
Blocks emails that contain links in the message body pointing to known phishing sites or if they contain typical phishing keywords. Phishing is an email based social engineering technique aimed at having email users disclose personal details to spammers. A phishing email is most likely crafted to resemble an official email originating from a reputable business, for example a bank. Phishing emails will usually contain instructions requiring users to reconfirm sensitive information such as online banking details or credit card information. Phishing emails usually include a phishing Uniform Resource
Identifier (URI) that the user is supposed to follow to key in some sensitive information on a phishing site. The site pointed to by the phishing URI might be a replica of an official site, but in reality it is controlled by whoever sent the phishing emails. When the user enters the sensitive information on the phishing site, the data is collected and used, for example, to withdraw money from bank accounts.
The Anti-Phishing filter detects phishing emails by comparing URIs present in the email to a database of URIs known to be used in phishing attacks. Phishing also looks for typical phishing keywords in the URIs.
The Anti-Phishing filter is enabled by default on installation.
Configuring Anti-Phishing
NOTE
Disabling Anti-Phishing is NOT recommended.
1.
Go to Anti-Spam > Anti-Spam Filters > Anti-Phishing .
2.
From the General tab, select/unselect Check mail messages for URIs to known phishing sites option to enable/dis able Anti-Phishing.
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Screenshot 64: Anti-Phishing options
3.
From the Keywords tab select any of the following options:
Option
Check URI's in mail messages for typical phishing keywords
Add
Description
Enable/disable checks for typical phishing keywords
Update
Remove
Export
Browse...
Add keywords that trigger the Anti-Phishing filter.
Key in a keyword and click Add to add a keyword to the Anti-Phishing filter
Updates selected keywords.
Select a keyword from the Current Keywords list, make any changes to keyword in Edit
Keywords field and click Update.
Removes selected keywords from list.
Select a keyword from the Current Keywords list, and click Remove.
Exports current list to an XML format file.
Enables importing of a previously exported keyword list.
Click Browse, select a previously exported keyword file and click Import.
4.
From the Updates tab, select any of the following options:
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Option
Automatically check for updates
Enable email notifications upon successful updates
Enable email notifications upon failed updates
Download updates now...
Description
Configure GFI MailEssentials to automatically check for and download any Anti-Phishing updates.
Specify the time interval in minutes when to check for updates.
NOTE
It is recommended to enable this option for Anti-Phishing to be more effective in detecting the latest phishing trends.
Select/unselect checkbox to be informed via email when new updates are downloaded.
Select/unselect to be informed when a download or installation fails.
Click to immediately download Anti-Phishing updates.
NOTE
You can download updates using a proxy server.
For more information, refer to Proxy settings (page 210).
5.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
6.
Click Apply .
5.1.3 Directory Harvesting
Directory harvesting attacks occur when spammers try to guess email addresses by attaching well known usernames to your domain. The majority of the email addresses are non-existent. Spammers send emails to randomly generated email addresses and while some email addresses may match real users, the majority of these messages are invalid and consequently floods the victim’s email server.
GFI MailEssentials stops these attacks by blocking emails addressed to users not in the organizations’ Active Directory or email server.
Directory harvesting can either be configured to execute when the full email is received or at SMTP level, that is, emails are filtered while they are being received. SMTP level filtering terminates the email’s connection and therefore stops the download of the full email, economizing on bandwidth and processing resources. In this case the connection is terminated immediately and emails are not required to go through any other anti-spam filters.
This filter is enabled by default on installing GFI MailEssentials in an Active Directory Environment.
Directory Harvesting is set up in two stages as follows
Stage 1 - Configuring Directory Harvesting properties
Stage 2 - Selecting if Directory Harvesting should be done during the SMTP transmission.
Stage 1 - Configuring Directory Harvesting properties
1.
Go to Anti-Spam > Anti-Spam Filters > Directory Harvesting .
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Screenshot 65: Directory Harvesting page
2.
Enable/Disable Directory Harvesting and select the lookup method to use:
Option
Enable directory har vesting protection
Use native Active
Directory lookups
Description
Enable/Disable Directory Harvesting.
Select option to retrieve the list of local users from Active Directory (or from a Remote AD if GFI
MailEssentials is installed in Remote Active Directory mode).
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Option
Use LDAP lookups
Description
Select this option when GFI MailEssentials is installed in SMTP mode and you want to retrieve the list of users from a separate Acitve Directory instance using LDAP.
Key in your Active Directory server details. If your LDAP server requires authentication, unmark the
Anonymous bind option and enter the authentication details that will be used by this feature.
NOTE
Specify authentication credentials using Domain\User format (for example master-domain\administrator).
3.
In Block if non-existent recipients equal or exceed , specify the number of nonexistent recipients that will qualify the email as spam. Emails will be blocked by Directory Harvesting if all the recipients of an email are invalid, or if the number of invalid recipients in an email equals or exceeds the limit specified.
NOTE
Avoid false positives by configuring a reasonable amount in the Block if non-existent recipients equal or exceed edit box. This value should account for users who send legitimate emails with mistyped email addresses or to users no longer employed with the company. It is recommended that this value is at least 2 .
4.
Provide an email address and click Test to verify Directory Harvesting settings. Repeat the test using a non-existent email address and ensure that Active Directory lookup fails.
5.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
NOTE
If Directory Harvesting is set to run at SMTP level, only the Log rule occurrence to this file option will be available in the Actions tab.
6.
Click Apply .
Stage 2 - Selecting if Directory Harvesting should be done during the SMTP transmission.
1.
Navigate to Anti-spam > Filter Priority , and select SMTP Transmission Filtering tab.
2.
Click Switch to toggle the Directory Harvesting filtering between:
Option
Filtering on receiving full email
Filtering during
SMTP transmission
Description
Filtering is done when the whole email is received.
Filtering is done during SMTP transmission by checking if the email recipients exist before the email body and attachment are received.
NOTE
If this option is chosen, Directory Harvesting will always run before the other spam filters.
3.
Click Apply .
5.1.4 Email blocklist
The Email Blocklist is a custom database of email addresses and domains from which you never want to receive emails.
This filter is enabled by default on installing GFI MailEssentials.
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Configuring Email Blocklist
1.
Go to Anti-Spam > Anti-Spam Filters > Email Blocklist .
Screenshot 66: Email blocklist
2.
From the Blocklist tab, configure the email addresses and domains to block.
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OPTION
Enable
Email Blocklist
Add
Remove
Import
Export
Search
DESCRIPTION
Select/Unselect to enable/disable email blocklist.
Add email addresses, email domains or an entire domain suffix to the blocklist.
1. Key in an email address, domain (for example, *@spammer.com); or an entire domain suffix (for example
*@*.tv) to add to the blocklist.
2. Specify the email type to match for the emails to be blocklisted.
NOTE
For more information about the difference between SMTP and MIME refer to: http://go.gfi.com/?pageid=ME_DifferenceSMTPMIME
3. (Optional) You can also add a description to the entry in the Description field.
4. Click Add.
Select a blocklist entry and click Remove to delete.
Import a list of blocklist entries from a file in XML format.
NOTE
A list of entries can be imported from a file in XML format in the same structure that GFI MailEssentials would export the list of entries.
Export the list of blocklist entries to a file in XML format.
Key in an entry to search for. Matching entries are filtered in the list of blocklist entries.
3.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
4.
Click Apply .
Personal Blocklist
The personal blocklist is an additional blocklist that compliments global blocklist. Disabled by default, the personal blocklist can be enabled for users to enable them to add specific email addresses to a personal blocklist that they can manage.
For more information, refer to End User Actions (page 12).
For management purposes, administrators can also remove specific email addresses that the users have added to their personal blocklist.
Enabling/Disabling Personal Blocklist
1.
Go to Anti-Spam > Email Blocklist .
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Screenshot 67: Personal blocklist
2.
Select Personal Blocklist tab and select or unselect Enable personal email blocklist to enable or disable personal blocklist feature.
3.
Click Apply .
Removing emails from users' personal blocklist
1.
Go to Anti-Spam > Email Blocklist and select Personal Blocklist tab.
2.
From the User drop down list, select the user for whom to delete an email address.
3.
Select an email address from the list of email addresses. Click Remove .
4.
Click Apply .
5.1.5 IP Blocklist
The IP Blocklist is a custom database of IP addresses from which you never want to receive emails.
This filter can be configured to execute when the full email is received or at SMTP level, that is, emails are filtered while they are being received. SMTP level filtering terminates the email’s connection and therefore stops the download of the full email, economizing on bandwidth and processing resources. In this case the connection is terminated immediately and emails are not required to go through any other anti-spam filters.
For more information, refer to
SMTP Transmission Filtering (page 132).
The IP Blocklist is NOT enabled by default.
Configuring Whitelist
1.
Go to Anti-Spam > Anti-Spam Filters > IP Blocklist .
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Screenshot 68: IP Blocklist
2.
From the General tab, select Enable IP Blocklist to block all emails received from specific IP addresses.
3.
In the IP Blocklist Entry box, specify the IP addresses to block:
Option
Single computer / CIDR
Group of computers
Description
Description
Key in a single IP address or a range of IP addresses using CIDR notation.
Specify the Subnet Address and Subnet Mask of the group of IPs to whitelist.
2. (Optional) Add a Description.
3 Click Add.
Optionally, add a description to help identify the specified IPs.
4.
Click Add to add the specified IP addresses to the IP Blocklist box.
5.
To delete IP addresses from the IP Blocklist, select the addresses to remove and click Remove .
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6.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
NOTE
If IP Blocklist is set to run at SMTP level, only the
Actions tab.
Log rule occurrence to this file option will be available in the
7.
Click Apply .
5.1.6 IP DNS Blocklist
IP DNS Blocklist checks the IP address of the sending mail server against a public list of mail servers known to send spam.
GFI MailEssentials supports a number of IP DNS Blocklists. There are a number of third party IP DNS Blocklists available, ranging from reliable lists that have clearly outlined procedures for getting on or off the IP DNS Blocklist to less reliable lists.
GFI MailEssentials maintains a cache with the results of queries to the IP DNS Blocklist to avoid querying the IP DNS
Blocklists multiple times for the same IP addresses. Items remain in the cache for 4 days and are cleared on GFI
MailEssentials AS Scan Engine service restart.
This filter can be configured to execute when the full email is received or at SMTP level, that is, emails are filtered while they are being received. SMTP level filtering terminates the email’s connection and therefore stops the download of the full email, economizing on bandwidth and processing resources. In this case the connection is terminated immediately and emails are not required to go through any other anti-spam filters.
For more information, refer to
SMTP Transmission Filtering (page 132).
This filter is enabled by default on installing GFI MailEssentials.
Important notes
1.
The DNS server must be properly configured for this feature to work. If this is not the case, time outs will occur and email traffic will be slowed down. For more information refer to: http://go.gfi.com/?pageid=ME_Pro cessingSlow
2.
Querying an IP DNS Blocklist can be slow (depending on your connection), so email can be slowed down a little bit.
3.
Ensure that all perimeter SMTP servers are configured in the Perimeter SMTP servers dialog so that GFI MailEs sentials can check the IP address that is connecting to the perimeter servers.
For more information, refer to Peri meter SMTP Server Settings (page 207).
Configuring IP DNS Blocklist
1.
Go to Anti-Spam > Anti-Spam Filters > IP DNS Blocklist .
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Screenshot 69: IP DNS Blocklist
2.
Configure the following options:
Option
Check whether the sending mail server is on one of the following IP DNS Blocklists:
Add IP DNS Blocklist
Description
Select to enable the IP DNS Blocklist filter.
Enable Selected
Disable Selected
Remove Selected
If required, add more IP DNS Blocklists to the ones already listed. Key in the IP
DNS Blocklist domain and click Add IP DNS Blocklist.
Select an IP DNS Blocklist and click Enable Selected to enable it.
Select an IP DNS Blocklist and click Disable Selected to disable it.
Select an IP DNS Blocklist and click Remove Selected to remove it.
3.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
4.
Click Apply .
NOTE
To enable IP DNS Blocklist at SMTP Transmission Filtering level, select Anti-Spam > Filter Priority >
SMTP Transmission Filtering tab and click Switch next to IP DNS Blocklist to enable/disable filtering at SMTP level or on receipt of full email.
5.1.7 URI DNS Blocklist
Stops emails that contain links to domains listed on public Spam URI Blocklists.
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A Universal Resource Identifier (URI) is a standard means of addressing resources on the Web.
Realtime Blocklists (RBL) detect spam based on hyperlinks in the email known to be used by spammers.
This filter is enabled by default on installing GFI MailEssentials.
Configuring URI DNS Blocklist
1.
Go to Anti-Spam > Anti-Spam Filters > URI DNS Blocklist .
Screenshot 70: URI DNS Blocklist
2.
From the URI DNS Blocklist tab:
Option
Check if mail message contains URIs with domains that are in these blocklists:
Add URI DNS Blocklist
Order of preference
Enable Selected
Disable Selected
Remove Selected
Description
Select this option to enable the URI DNS Blocklist filter.
If required, add more URI DNS Blocklists to the ones already listed. Key in the full name of the URI DNS Blocklist domain and click Add URI DNS Blocklist.
The order of preference for enabled URI DNS Blocklists can be changed by selecting a blocklist and clicking on the Up or Down buttons.
Select a URI DNS Blocklist and click Enable Selected to enable it.
NOTE
It is recommended to disable all other URI DNS Blocklists when enabling
multi.surbl.org as this might increase email processing time.
Select a URI DNS Blocklist and click Disable Selected to disable it.
Select a URI DNS Blocklist and click Remove Selected to remove it.
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3.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
4.
Click Apply .
5.1.8 Sender Policy Framework
This filter uses SPF records to stop email sent from forged IP addresses by identifying if the sender IP address is authorized. The Sender Policy Framework filter is based on a community-based effort, which requires that the senders publish the IP addresses of their mail servers in an SPF record.
Example: If an email is sent from [email protected] then companyABC.com must publish an SPF record in order for
SPF to be able to determine if the email was really sent from the companyABC.com network or whether it was forged. If an SPF record is not published by CompanyABC.com, the SPF result will be ‘unknown’.
For more information on SPF and how it works, visit the Sender Policy Framework website at: http://www.openspf.org
NOTE
GFI MailEssentials does not make it a requirement to publish an SPF record.
The SPF filter is NOT enabled by default and it is recommended to enable this option and to have this filter running prior to the Email Whitelist so to block forged senders before these are whitelisted.
Prerequisites
Before enabling the Sender Policy Framework filter on a non-gateway server installation:
1.
Go to General Settings > Perimeter SMTP Servers .
2.
Click Detect in the SMTP Server list area to perform a DNS MX lookup and automatically define the IP address of your perimeter SMTP server.
Enabling the Sender Policy Framework
1.
Select Anti-Spam > Anti-Spam Filters > Sender Policy Framework .
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Screenshot 71: Enable and configure the Sender Policy Framework
2.
Click Enabled to enable the Sender Policy Framework filter. If the email sender IP address is definitely not authorized to send emails from the sender domain, emails are blocked.
3.
Optionally, select Enable Advanced SPF filtering and select one of the advanced option from:
OPTION
Block SOFT FAIL result
DESCRIPTION
Blocks all emails which:
Sender IP address is definitely not allowed to send emails from the sender domain
Sender IP address is probably not allowed to send emails from the sender domain.
For more information on Advanced SPF filtering, refer to: http://go.gfi.com/?pageid=ME_SPFfilter
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OPTION
Block SOFT FAIL, Neutral, Unknown and NONE results
DESCRIPTION
Blocks all emails which:
Sender IP address is definitely not allowed to send emails from the sender domain
Sender IP address is probably not allowed to send emails from the sender domain.
Sender IP address is explicitly inconclusive, unknown or for which there is no published data.
For more information on Advanced SPF filtering, refer to: http://go.gfi.com/?pageid=ME_SPFfilter
4.
Select IP Exceptions or Email Exceptions tab to configure IP addresses and/or recipients to exclude from SPF checks:
IP exception list: Entries in this list automatically pass SPF checks. Select IP Exception List checkbox,add a new IP address and description and click Add . To remove entries, select entries from the list and click Remove Selected . To dis able the IP exception list unselect IP Exception List checkbox.
NOTE
When adding IP addresses to the IP exception list, you can also add a range of IP addresses using the CIDR notation.
Email exception list: This option ensures that certain email senders or recipients are excluded from SPF checking, even if the messages are rejected.Select
Email Exception List checkbox,add a new email address and description and click Add . To remove entries, select entries from the list and click Remove Selected . To disable the Email exception list unselect Email Exception List checkbox. An email address can be entered in any of the following three ways: local part - ‘abuse’ (matches ‘[email protected]’, ‘[email protected]’, etc...) domain - ‘@abc.com’ (matches ‘[email protected]’, ‘[email protected]’, etc...) complete - ‘[email protected]’ (only matches ‘[email protected]’)
5.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
6.
Click Apply to save settings.
5.1.9 Anti-Spoofing
Checks emails received with a sender email address claiming to originate from your own domain against a list of IP addresses by GFI MailEssentials. If the sender IP address is not on the list of own-domain server IP addresses, email is blocked.
This filter is NOT enabled by default.
WARNING
If enabling this feature do not whitelist internal users since this defeats Anti-Spoofing check.
Enabling and configuring Anti-Spoofing
1.
Go to Anti-Spam > Anti-Spam Filters > Anti-Spoofing .
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Screenshot 72: GFI MailEssentials Anti-Spoofing filter
2.
Select Enable Anti-Spoofing to enable Anti-Spoofing filter.
3.
In the SMTP Server: field, provide the SMTP server where GFI MailEssentials checks for email recipient addresses. Also provide a description for the server in the Description: field.
NOTE
The SMTP Server field supports the following types of entry:
A single IP Address
A CIDR range (for example, 192.0.2.1/24)
4.
Click Add SMTP Server to save SMTP server details.
NOTE
To remove previously added SMTP Servers, select an SMTP Server from the Authorized IP Address list and click
Remove Selected .
By default, Use authorized IP addresses from perimeter servers list and Do not block authenticated connections are enabled. It is not recommended that these options are disabled.
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NOTE
Do not block authenticated connections checkbox does not apply for Microsoft IIS and Microsoft Exchange 2003.
It only works with Exchange 2007 or later.
5.1.10 Greylist
The Greylist filter temporarily blocks incoming emails received from unknown senders. Legitimate mail systems typically try to send the email after a few minutes; spammers simply ignore such error messages. If an email is received again after a predefined period, Greylist will:
1.
Store the details of the sender in a database so that when the sender sends another email, the email will not be greylisted
2.
Receive the email and proceed with anti-spam scanning
Greylist is NOT enabled by default.
Important Notes
1.
To enable Greylist, GFI MailEssentials must be installed on the perimeter SMTP server. For more information refer to http://go.gfi.com/?pageid=ME_GreylistSMTP
2.
Greylist contains exclusion lists so that specific email addresses, domains and IP addresses are not greylisted.
Exclusions must be configured when:
Emails originating from particular email addresses, domains or IP addresses cannot be delayed
Emails addressed to a particular local user cannot be delayed
Configuring Greylist
1.
Go to Anti-Spam > Anti-Spam Filters > Greylist .
2.
From the General tab select/unselect Enable Greylist to enable/disable Greylist.
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Screenshot 73: Email Exclusions
3.
Select Email exclusions tab to specify any email addresses or domains that you do not want to greylist. In the Edit
Addresses area specify: full email address; or emails from an entire domain (for example: *@trusteddomain.com); or an entire domain suffix (for example: *@*.mil or *@*.edu)
Also specify if the exclusion applies to senders (select From (>) ) or to the local recipients (select To (>) ).
Example 1: Do not greylist emails if the recipient is [email protected], so that any emails sent to admin [email protected] are never delayed.
Example 2: Do not greylist emails if the sender’s domain is trusteddomain.com ( *@trusteddomain.com
), so that emails received from domain trusteddomain.com are never delayed.
Click Add emails to add the exclusion.
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NOTE
To exclude whitelisted and auto-whitelisted email addresses and domains from being greylisted and delayed, select Exclude email addresses and domains specified in Whitelist and Personal Whitelist .
4.
Select the IP exclusions tab to specify any IP addresses to exclude from being greylisted. Click Add IPs and specify an
IP to exclude.
5.
To exclude whitelisted IP addresses from being greylisted and delayed, select Exclude IP addresses specified in
Whitelist .
6.
To log Greylist occurrences to a log file, click Actions tab and select Log rule occurrence to this file .
NOTE
Log files may become very large. GFI MailEssentials supports log rotation, where new log files are created periodically or when the log file reaches a specific size. To enable log file rotation navigate to Anti-Spam > Anti-
Spam Settings . Select Anti-spam logging tab, check Enable log file rotation and specify the rotation condition.
7.
Click Apply .
5.1.11 Language Detection
Determines the language of the email body text and configurable to block certain languages. GFI MailEssentials takes a portion of the email body message and compares it to an in-built language engine.
Configure the Language Detection filter to block certain languages or allow only some language.
NOTE
The Language Detection filter is different than the
filter since it analyzes the language of the email body text. The Header Checking analyzes the encoding (character set) of the email header.
Results of the Language Detection filtering engine are generally more reliable.
The Language Detection filter is NOT enabled by default on installation.
Configuring Language Detection
1.
Go to Anti-Spam > Anti-Spam Filters > Language Detection .
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Screenshot 74: Language Detection options
2.
From the General tab, select/unselect Filter emails by language option to enable/disable Language Detection.
3.
Select Block the list below to select the languages to block or Block all except the list below to block all languages except the ones selected.
4.
Select the languages to block/allow from the Languages area.
5.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
6.
Click Apply .
5.1.12 Header Checking
The Header Checking filter analyses the email header to identify spam emails.
Configuring Header Checking
1.
Go to Anti-Spam > Anti-Spam Filters > Header Checking .
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Screenshot 75: Header checking options
2.
Enable, disable or configure the following parameters:
Option
Check if the email header con tains an empty MIME FROM: field.
Description
Checks if the sender has identified himself in the From: field. If this field is empty, the message is marked as spam.
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Option
Check if the email header con tains a malformed MIME FROM: field.
Maximum number of recipients allowed in email
Check if the email headers con tain different SMTP TO: and MIME
TO: fields.
Description
Checks if the MIME from field is a correct notation as defined in the RFCs.
Identifies emails with large amounts of recipients and flags them as SPAM.
Verify if sender domain is valid
(performs DNS lookup on MIME
FROM:)
Maximum numbers allowed in the first part of the MIME FROM: field:
Check if email contains encoded
IP addresses.
Checks whether the SMTP to: and MIME to: fields are the same. The spammers email server always has to include an SMTP to: address. However, the MIME to: email address is often not included or is different.
NOTE: This feature identifies a lot of spam, however some list servers do not include the MIME to: either. It is therefore recommended to whitelist newsletter sender address to use this feature.
Performs a DNS lookup on the domain in the MIME from field and verifies the domain validity.
NOTE: Ensure that the DNS server is properly configured to avoid timeouts and slow email flow.
Identifies the presence of numbers in the MIME from field. Spammers often use tools that auto matically create unique reply-to: addresses by using numbers in the address.
Checks the message header and body for URLs which have a hex/octal encoded IP
(http://0072389472/hello.com) or which have a username/password combination (for example [email protected]).
The following examples are flagged as spam: http://12312 www.microsoft.com:hello%01@123123
Flag emails that only have remote images and a minimal amount of text as spam. Assists in identifying ‘image only email’ spam.
Check if email contains remote images only. Minimum HTML body size
Check if email contains GIF images.
Check if email contains attach ment spam.
Check if the email subject con tains the first part of the recipient email address.
Checks if the email contains one or more embedded GIF images. Embedded GIF images are often used to circumvent spam filters.
IMPORTANT: Since some legitimate emails contain embedded GIF images, this option is prone to false positives.
Checks email attachments for properties that are common to attachments sent in spam email.
This helps in keeping up with the latest techniques used by spammers in using attachments to send spam.
Identifies the personalized spam email, where spammers frequently include the first part of the recipient email address in the subject.
3.
From the Languages tab, select Block mail that use these languages (character sets) to enable language detection.
NOTE
The Header Checking - Language filter is different than the
filter since it analyzes the encoding (character set) of the email header. The Language Detection analyzes the language of the email body text. Results of the Language Detection filtering engine are generally more reliable.
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Screenshot 76: Language Detection
4.
Select Block the list below to select the languages to block or Block all except the list below to block all languages except the ones selected.
5.
Select the languages to block/allow from the Languages area.
6.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
7.
Click Apply .
5.1.13 Spam Keyword Checking
This filter enables the identification of Spam based on keywords in the email being received.
This filter is NOT enabled by default on installing GFI MailEssentials.
NOTE
This filter only checks the content of the email for text that identifies the email as Spam. For comprehensive content filtering of email (for example to block Racial content or Profanities), use the Keyword filtering option within the
Content Filtering node.
Add Spam Keyword Check
1.
Go to Anti-Spam > Anti-Spam Filters > Spam Keyword Checking .
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2.
From the Body tab, select Block emails if content is found matching these conditions (message body) to enable
Spam Keyword checking on email body.
Screenshot 77: Spam Keyword checking properties
3.
In the Condition Entry area, key in a keyword or a combination of keywords for this filter to block. Use the 'AND', 'OR',
'AND NOT' and 'OR NOT' operators to configure specific conditions.
For example:
Basketball sports - GFI MailEssentials blocks emails with the phrase Basketball sports .
Only this phrase would activate the rule, not the word some other words.
basketball OR the word sports separated by
Basketball AND Baseball - GFI MailEssentials blocks emails that have both words in the email.
Emails with only Basketball or only baseball will not be blocked.
4.
Select Match whole words only to search specifically for whole words and avoid blocking words that are part of other words. For example, enabling this option would not block the word 'MSExchange', notwithstanding the fact that the word 'sex' is part of 'MSExchange'.
5.
Select Subject tab, select Block emails if content is found matching these conditions (message subject) to enable
Spam Keyword checking on email subject.
6.
In the Condition Entry area, key in a keyword or a combination of keywords for this filter to block. Use the 'AND', 'OR',
'AND NOT' and 'OR NOT' operators to configure specific conditions.
7.
Select Apply the keywords list to also scan senders' display names to check the display name of the sender email, which can contain spam keywords. For example, Viagra spam, which often has forged senders and the word Viagra in the senders' display name.
8.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
9.
Click Apply .
Removing conditions
To remove a Spam Keyword Checking condition:
1.
From the Conditions list area within the Body or Subject tab, select one or more conditions to remove.
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NOTE
To find the condition to remove, use the controls under the list of conditions to move between the pages listing the conditions.
2.
Click Remove and Apply .
Importing and Exporting conditions
To export more conditions:
1.
From the Conditions list area within the Body or Subject tab, select one or more conditions to export.
NOTE
To find the conditions to export, use the controls under the list of conditions to move between the pages listing the conditions.
2.
In the File Download screen, click Save and select a folder where to save the export file.
To import conditions:
1.
From the Conditions list area within the Body or Subject tab, key in the folder and filename of the file to import.
2.
Click Import .
5.1.14 Bayesian Analysis
An anti-spam filter that can be trained to accurately determine if an email is spam based on past experience.
This manual also contains information how the Bayesian filter works and how it can be trained.
For more information, refer to How Bayesian Analysis works (page 120).
The Bayesian Analysis filter is NOT enabled by default.
IMPORTANT
Enable learning from outbound emails and allow at least a week for before enabling filter. This is required because the Bayesian filter acquires its highest detection rate when it adapts to your email patterns.
Configuring the Bayesian filter
Configuring the Bayesian filter requires 2 stages:
Stage 1: Training the Bayesian filter
Stage 2: Enabling the Bayesian filter
Stage 1: Training the Bayesian filter
The Bayesian filter can be trained in two ways:
Method 1: Automatically, through outbound emails.
GFI MailEssentials processes legitimate email (ham) by scanning outbound emails. The Bayesian filter can be enabled after it has collected at least 500 outbound emails (If you send out mainly English email) or 1000 outbound mails (If you send out non-English email).
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To do this:
1. Go to Anti-Spam > Anti-Spam Filters > Bayesian Analysis .
2. Select Automatically learn from outbound e-mails .
3. Click Apply .
Method 2: Manually, through existing email.
Copying between 500-1000 mails from your sent items to the This is legitimate email sub folder in the GFI AntiSpam
Folders public folders trains the Bayesian filter in the same way as live outbound email sending.
NOTE
To use this option, Public Folder Scanning must be enabled.
For more information, refer to Public Folder
Stage 2: Enabling the Bayesian filter
After the Bayesian filter is trained, it must be enabled.
1.
From GFI MailEssentials configuration console, go to Anti-Spam > Anti-Spam Filters > Bayesian Analysis .
2.
From the General tab select Enable Bayesian Analysis .
Screenshot 78: Bayesian analysis properties
3.
In the Updates tab, configure the frequency of updates to the spam database by enabling Automatically check for updates and configuring an hourly interval.
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NOTE
Click Download updates now...
to immediately download any updates.
NOTE
You can download updates using a proxy server.
For more information, refer to Proxy settings (page 210).
4.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
5.
Click Apply .
NOTE
GFI MailEssentials also provides a Bayesian Analysis wizard that enables you to train the Bayesian Analysis filter from a machine other than where GFI MailEssentials is installed.
For more information, refer to Training the Bayesian
How Bayesian Analysis works
The Bayesian filter is an anti-spam technology used within GFI MailEssentials. It is an adaptive technique based on artificial intelligence algorithms, hardened to withstand the widest range of spamming techniques available today.
This chapter explains how the Bayesian filter works, how it can be configured and how it can be trained.
NOTE
1. The Bayesian anti-spam filter is disabled by default. It is highly recommended that you train the Bayesian filter before enabling it.
2. GFI MailEssentials must operate for at least one week for the Bayesian filter to achieve its optimal performance. This is required because the Bayesian filter acquires its highest detection rate when it adapts to your email patterns.
How does the Bayesian spam filter work?
Bayesian filtering is based on the principle that most events are dependent and that the probability of an event occurring in the future can be inferred from the previous occurrences of that event.
NOTE
Refer to the links below for more information on the mathematical basis of Bayesian filtering: http://go.gfi.com/?pageid=ME_BayesianParameterEstimation
This same technique has been adapted by GFI MailEssentials to identify and classify spam. If a snippet of text frequently occurs in spam emails but not in legitimate emails, it would be reasonable to assume that this email is probably spam.
Creating a tailor-made Bayesian word database
Before Bayesian filtering is used, a database with words and tokens (for example $ sign, IP addresses and domains, etc,) must be created. This can be collected from a sample of spam email and valid email (referred to as ‘ham’).
A probability value is then assigned to each word or token; this is based on calculations that account for how often such word occurs in spam as opposed to ham. This is done by analyzing the users' outbound email and known spam: All the words and tokens in both pools of email are analyzed to generate the probability that a particular word points to the email being spam.
This probability is calculated as per following example:
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If the word ‘mortgage’ occurs in 400 out of 3,000 spam emails and in 5 out of 300 legitimate emails then its spam probability would be 0.8889 (i.e. [400/3000] / [5/300 + 400/3000]).
Creating a custom ham email database
The analysis of ham email is performed on the company's email and therefore is tailored to that particular company.
Example: A financial institution might use the word ‘mortgage’ many times and would get many false positives if using a general anti-spam rule set. On the other hand, the Bayesian filter, if tailored to your company through an initial training period, takes note of the company's valid outbound email (and recognizes ‘mortgage’ as being frequently used in legitimate messages), it will have a much better spam detection rate and a far lower false positive rate.
Creating the Bayesian spam database
Besides ham email, the Bayesian filter also relies on a spam data file. This spam data file must include a large sample of known spam. In addition it must also constantly be updated with the latest spam by the anti-spam software. This will ensure that the Bayesian filter is aware of the latest spam trends, resulting in a high spam detection rate.
How is Bayesian filtering done?
Once the ham and spam databases have been created, the word probabilities can be calculated and the filter is ready for use.
On arrival, the new email is broken down into words and the most relevant words (those that are most significant in identifying whether the email is spam or not) are identified. Using these words, the Bayesian filter calculates the probability of the new message being spam. If the probability is greater than a threshold, the message is classified as spam.
NOTE
For more information on Bayesian Filtering and its advantages refer to: http://go.gfi.com/?pageid=ME_Bayesian
Training the Bayesian Analysis filter
NOTE
The Bayesian Analysis filter can also be trained using Public folders.
For more information, refer to Configuring the
It is recommended that the Bayesian Analysis filter is trained through the organization’s mail flow over a period of time. It is also possible for Bayesian Analysis to be trained from emails sent or received before GFI MailEssentials is installed by using the Bayesian Analysis wizard. This allows Bayesian Analysis to be enabled immediately.
This wizard analyzes sources of: legitimate mail - for example a mailbox’ sent items folder spam mail - for example a mailbox folder dedicated to spam emails.
Step 1: Install the Bayesian Analysis wizard
The Bayesian Analysis wizard can be installed on:
A machine that communicates with Microsoft ® Exchange - to analyze emails in a mailbox
A machine with Microsoft Outlook installed - to analyze emails in Microsoft Outlook
To install the Bayesian Analysis wizard:
1.
Copy the setup file Bayesian Analysis Wizard.exe
to the chosen machine. This is located in: GFI MailEssentials install ation path\AntiSpam\BSW\
2.
Launch Bayesian Analysis Wizard.exe
.
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3.
In the initial screen, choose the language and review the End-User License Agreement. Click Next .
4.
Select the installation folder and click Next .
5.
Click Install to start installation.
6.
Click Finish when installation is complete.
Step 2: Analyze legitimate and spam emails
To start analyzing emails using the Bayesian Analysis wizard:
1. Load the Bayesian Analysis wizard from Start > Programs > GFI MailEssentials > GFI MailEssentials Bayesian Analysis
Wizard .
2. Click Next in the welcome screen.
3. Choose whether to:
Create a new Bayesian Spam Profile (.bsp) file or update an existing one. Specify the path where to store the file and the filename.
Update the Bayesian Spam profile used by the Bayesian Analysis filter directly when installing on the same machine as GFI MailEssentials.
Click Next to proceed.
4. Select how the wizard will access legitimate emails. Select:
Use Microsoft Outlook profile configured on this machine - Retrieves emails from a Microsoft Outlook mail folder.
Microsoft Outlook must be running to use this option.
Connect to a Microsoft ® Exchange Server mailbox store
Specify the logon credentials in the next screen.
- Retrieves emails from a Microsoft
®
Exchange mailbox.
6.
Do not update legitimate mail (ham) in the Bayesian Spam profile - skip retrieval of legitimate emails. Skip to step
Click Next to continue.
5. After the wizard connects to the source, select the folder containing the list of legitimate emails (e.g. the Sent items folder) and click Next .
6. Select how the wizard will access the source of spam emails. Select:
Download latest Spam profile from GFI website - Downloads a spam profile file that is regularly updated by col lecting mail from leading spam archive sites. An Internet connection is required.
Use Microsoft Outlook profile configured on this machine - Retrieves spam from a Microsoft Outlook mail folder.
Microsoft Outlook must be running to use this option.
Connect to a Microsoft
®
Exchange Server mailbox store cify the logon credentials in the next screen.
- Retrieves spam from a Microsoft
®
Exchange mailbox. Spe
Do not update Spam in the Bayesian Spam profile - skip retrieval of spam emails. Skip to step 8.
Click Next to continue.
7. After the wizard connects to the source, select the folder containing the list of spam emails and click Next .
8. Click Next to start retrieving the sources specified. This process may take several minutes to complete.
9. Click Finish to close the wizard.
Step 3: Import the Bayesian Spam profile
When the wizard is not run on the GFI MailEssentials server, import the Bayesian Spam Profile (.bsp) file to GFI
MailEssentials.
1. Move the file to the Data folder in the GFI MailEssentials installation path.
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2. Restart the GFI MailEssentials AS Scan Engine and the GFI MailEssentials Legacy Attendant services.
5.1.15 Whitelist
NOTE
Whitelist affects only Anti-Spam filters and not email security and content filtering
The Whitelist contains lists of criteria that identify legitimate email. Emails that match these criteria are not scanned by anti-spam filters and are always delivered to the recipient. Emails can be whitelisted using the following criteria:
Sender’s email address, email domain or IP address
Senders to whom an email was previously sent (Auto-whitelist)
Recipient (exclude local email addresses from having emails filtered)
Keywords in email body or subject
The whitelist and Auto Whitelist features are enabled by default.
Important notes
Using the Auto Whitelist feature is highly recommended since this eliminates a high percentage of false positives.
In Keyword Whitelist it is recommended to add terms that spammers do not use and terms that relate to your nature of business, for example your product names. Entering too many keywords increases the possibility of emails not filtered by GFI MailEssentials and delivered to users’ mailboxes.
Whitelisting an internal user defeats the purpose of the Anti-Spoofing filter.
For more information, refer to Anti-
Configuring Whitelist
1.
Go to Anti-Spam > Whitelist .
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Screenshot 79: Whitelist tab
2.
From the Whitelist tab, configure the email addresses and domains to whitelist. Select/Unselect Enable email whitel ist to enable/disable whitelist. Perform the following actions:
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Action
Add a whitelist entry
Remove whitelist entries
Search for a whitelist entry
Show Statistics
Import whitelist entries
Export whitelist entries
Description
1. In Email Address/Domain, provide the email address/domain to whitelist. For example: . *@com panysupport.com or. *@*.edu.
2. In Email Type specify the email header field to match for the emails to be whitelisted.
NOTE
For more information about the difference between SMTP and MIME refer to: http://go.gfi.com/?pageid=ME_DifferenceSMTPMIME
3. (Optional) In Description add a description to the entry.
4. Click Add.
1. Select one or more whitelist entries from the Whitelist list.
2. Click Remove.
1. In Search, key in the details of the whitelist entry to search for.
2. Click Search to display list of matching terms.
Use the Show Statistics button to view the total number of emails blocked per whitelist entry.
1. Specify the full path and filename of the file to use for importing the previously exported data.
2. Click Import to import entries.
Click Export to export current list of whitelist entry to an XML file.
3.
Select the Auto Whitelist tab to configure the following options:
Option
Populate Auto Whitel ist automatically:
Enable Email Auto
Whitelist
Maximum entries allowed in the Auto
Whitelist:
Description
If selected, destination email addresses of outbound emails are automatically added to the auto-whitelist.
Select this option to enable auto-whitelist. Senders of incoming emails are matched against the autowhitelist. If the sender is present in the list, the email is forwarded directly to the recipient’s Inbox.
Specify the number entries allowed in Auto-Whitelist. When the limit specified is exceeded, the oldest and least used entries are automatically replaced by the new entries.
NOTE
Entering a value larger than the default value of 30,000 can negatively affect the performance of GFI
MailEssentials.
4.
From the Keyword Whitelist tab, specify keywords that flag emails as valid emails:
Option
Enable email body keyword whitelist
Enable email subject keyword whitelist
Match whole words only (words/phrases in subject/body)
Description
Select this option to check for keywords in the email body which qualify an email as valid.
Add keywords to the Body Keywords list.
You can also import or export lists of keywords from/to an XML file.
Select this option to check for keywords in the email subject which qualify an email as valid.
Add keywords to the Subject Keywords list.
You can also import or export lists of keywords from/to an XML file.
When selecting this option, only whole words from the keyword whitelist are matched that qualify an email as valid.
5.
From the IP Whitelist tab, configure:
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Option
Enable IP Whitelist
Description
Select to allow emails received from specific IP addresses to be whitelisted.
Add IP Whitelist entries 1. Specify:
Single computer / CIDR: Key in a single IP address or a range of IP addresses using CIDR notation.
Group of computers: Specify the Subnet Address and Subnet Mask of the group of IPs to whitel ist.
2. (Optional) Add a Description.
3 Click Add.
Remove IP Whitelist entries Select the IPs to remove and click Remove.
6.
Click Actions tab to enable / disable logging of whitelist occurrences to a file. Provide a path/folder where to store the generated log file.
7.
Click Apply .
Personal Whitelist
The personal whitelist is an additional whitelist that compliments global whitelist. Disabled by default, the personal whitelist can be enabled for users allowing them to add specific email addresses to a personal whitelist that they can manage.
For more information, refer to End User Actions (page 12).
For management purposes, administrators can also remove specific email addresses that the users have added to their personal whitelist.
Enabling/Disabling Personal Whitelists
1.
Go to Anti-Spam > Whitelist .
Screenshot 80: Personal whitelist
2.
Select Personal Whitelist tab and select or unselect Enable personal email whitelist to enable or disable personal whitelist feature.
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3.
Click Apply .
Removing emails from users' personal whitelist
1.
Go to Anti-Spam > Whitelist and select Personal Whitelist tab.
2.
From the User drop down list, select the user for whom to delete an email address.
3.
Select an email address from the list of email addresses. Click Remove .
4.
Click Apply .
5.1.16 New Senders
The New Senders filter identifies emails that have been received from senders to whom emails have never been sent before. Such senders are identified by referencing the data collected in the Whitelist.
Only emails in which no spam is detected and where the sender is not present in any Whitelist are triggered by the
New Senders filter.
This filter is NOT enabled by default.
Important
Enable at least one of the available Whitelists to use the New Senders function. In the absence of the Whitelist functions (should no spam be detected by the other filters) received messages will be delivered to the recipient’s
Inbox.
ONLY emails in which no spam was detected and whose senders are not present in the Whitelist are delivered in the New Senders folder.
Configuring New Senders Filter
1.
Go to Anti-Spam > New Senders .
Screenshot 81: New Senders General tab
2.
In the General tab, select Enable New Senders to enable check for new senders on all inbound messages.
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Screenshot 82: New Senders Exceptions
3.
From Exceptions tab, configure recipients whose emails are excluded from the New Senders check.
Option
Enable New Senders exception list
Add exception
Edit exception
Delete exception
Description
Select this option to enable the exceptions list.
Key in an email address to exclude and click Add.
Repeat for each address to add.
1. Select an exception from the Email list.
2. Edit the email address.
3. Click Update.
Select an exception from the Email list and click Remove.
4.
Click Actions tab to select the actions to perform on messages identified as spam.
For more information, refer to
Spam Actions - What to do with spam emails (page 128).
5.
Click Apply .
5.2 Spam Actions - What to do with spam emails
The Actions tab in the Anti-Spam filters properties define what should be done with emails marked as spam. Different actions can be defined for each of the spam filters.
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For Example: Delete emails detected by SpamRazer filter, but do not delete emails marked as spam by the Email
Blocklist filter.
5.2.1 Configuring Spam Actions
In the Actions tab, select an option that defines which action to take on emails marked as spam.
Screenshot 83: Anti-spam actions
Action
Quarantine Email
Delete Email
Deliver email to mailbox - In
Inbox
Description
Emails detected as spam are stored in the Quarantine Store. Other spam actions are disabled if the email is quar
antined. For more information, refer to Quarantine (page 177).
Delete an email blocked by that particular spam filter. Other spam actions are disabled if the email is deleted.
Routes spam to user's inbox
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Action
Deliver email to mailbox - In
Exchange junk email folder
Deliver email to mailbox - In
Exchange mail box sub-folder
Send to email address
Move to folder on disk
Tag the email with specific text
Append block reason to email subject
Log rule occur rence to this file
Description
Routes spam to users' Junk email folder. This option only works when GFI MailEssentials is installed on Microsoft
Exchange. It is not available for the New Senders filter.
If GFI MailEssentials is not installed on the Microsoft
®
Exchange Server, refer to
Moving spam to user’s mailbox folders
.
Route all spam to a specific folder in the user’s mailbox. Type the folder where to move spam email.
Example 1: Type Suspected Spam for a custom folder to be created in the same level of the Inbox folder.
Example 2: Type Inbox\Suspected Spam for a custom folder to be created in the Inbox folder.
This option requires that GFI MailEssentials is installed on the Microsoft
In Microsoft ®
For Microsoft ®
®
Exchange Server machine.
Exchange 2007 onwards, the Mailbox Server Role is required.
If GFI MailEssentials is not installed on the Microsoft
®
Exchange Server, refer to
Moving spam email to user’s mailbox folders
.
Send email identified as spam to a specific email address.
Example: Forward all spam to an email address checked by someone who checks email that might have been wrongly marked as spam.
The subject of the email will be in the format: [recipient] [subject]
Saves email detected as spam to the path specified,
Example: C:\Spam\
File names of saved emails are in the following format:
[Sender_recipient_subject_number_.eml]
Example:C:\Spam\[email protected][email protected]_MailOffers_1_.eml)
Select this option to add a tag to the email subject. Key in the text to use for tagging and specify where to place the tag:
Prepend to subject - insert the specified tag at the start (i.e. as a prefix) of the email subject text.
Example: [SPAM]Free Web Mail
Append to subject - insert the specified tag at the end (i.e. as a suffix) of the email subject text.
Example: Free Web Mail[SPAM]
Add tag in an X-header… - Add the specified tag as a new X-header to the email. In this case, the X-
Header will have the following format :
X-GFIME-SPAM: [TAG TEXT]
X-GFIME-SPAM-REASON: [REASON]
Example:
X-GFIME-SPAM: [This is SPAM]
X-GFIME-SPAM-REASON: [IP DNS Blocklist Check failed - Sent from Blocklisted Domain]
NOTE
Rules manager can be used to move emails when this feature is used.
If this option is enabled, the name of the filter which blocked the email and the reason for blocking are appen ded to the subject of the blocked email.
Log the spam email occurrence to a log file of your choice. By default, log files are stored in:
<GFI MailEssentials installation
path>\GFI\MailEssentials\AntiSpam\Logs\<filtername>.log
NOTE
Log files may become very large. GFI MailEssentials enables log rotation, where new log files are created periodically or when the log file reaches a specific size. To enable log file rotation navigate to Anti-Spam >
Anti-Spam Settings. Select Anti-spam logging tab and check Enable log file rotation. Specify the rotation condition by time or file size.
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5.3 Sorting anti-spam filters by priority
In GFI MailEssentials, the order in which the anti-spam checks are applied to inbound messages can be customized.
NOTE
The order of all available filters can be customized except for the New Senders filter, which is always automatically set to the lowest priority. This is due to its dependency on the results of the Whitelist checks and the other antispam filters.
Default priority is recommended in most situations.
1.
Go to Anti-Spam > Filter Priority .
Screenshot 84: Assigning filter priorities
2.
Select a filter and click (up) button to assign a higher priority or click (down) button to assign a lower priority.
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NOTE
Click Default Settings to restore the filters' order to default.
3.
Click Apply .
5.4 SMTP Transmission Filtering
In GFI MailEssentials, some anti-spam filters can be configured to execute when the full email is received or at SMTP
Transmission level. In SMTP Transmission filtering, emails are scanned whilst they are being received.
SMTP level filtering terminates the email’s connection and therefore stops the download of the full email, economizing on bandwidth and processing resources. In this case the connection is terminated immediately and emails are not required to go through any other anti-spam filters.
IMPORTANT
To make the best of SMTP Transmission filtering, use it when GFI MailEssentials is installed on an Internet gateway or when it is the first server to receive emails from the Internet.
1.
Go to Anti-Spam > Filter Priority and select the SMTP Transmission Filtering tab.
Screenshot 85: SMTP Transmission Filtering properties
2.
Click Switch to toggle the Directory Harvesting filtering between:
Option
Filtering on receiving full email
Filtering during
SMTP transmission
Description
Filtering is done when the whole email is received.
Filtering is done during SMTP transmission. If this option is chosen, the filter is always run before the other spam filters.
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NOTE
The Greylist filter runs at SMTP Transmission level only.
3.
Click Apply .
5.5 Spam Digest
The spam digest is a short report sent to an administrator or user via email. This report lists the total number of emails processed by GFI MailEssentials and the number of spam emails blocked over a specific period of time (since the last spam digest).
5.5.1 Administrator spam digest
1.
Go to Anti-Spam > Spam Digest .
Screenshot 86: Spam digest properties/Administrator spam digest
2.
From the Administrator Digest tab, click Send administrator spam digest to enable spam digest.
3.
Configure the desired sending frequency (Daily, Weekly, Monthly) and specify a date and a time when email is sent.
4.
Specify the digest content that will be sent in the email, either a Total count of processed email and spam or Total spam captured per spam filter or both.
5.
Finalize settings by selecting Apply .
5.5.2 Recipient spam digest
1.
Go to Anti-Spam > Spam Digest .
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Screenshot 87: Recipient spam digest
2.
From the Recipient Digest tab, select Send recipient spam digest to enable spam digest.
3.
Configure the desired sending frequency (Daily, Weekly, Monthly) and specify a date and a time when email is sent.
4.
Specify the digest content that will be sent in the email:
Total count of processed email and spam
Total spam captured per spam filter type
List of blocked spam or any combination of options as required.
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Screenshot 88: Spam digest recipient list
4.
Click on the Recipients list tab, add the users to receive the spam digest and select the method used to determine who should receive the spam digest.
Available options are:
Only users listed below should receive the recipient spam digest.
All users except the ones listed below will receive the recipient spam digest.
NOTE
The required list of users can also be imported from a file in XML format in the same structure that GFI MailEssentials would export files.
6. Select Apply to finalize settings.
5.6 Anti-Spam settings
The following settings are configurable for anti-spam filters and emails blocked by anti-spam filters only.
5.6.1 Log file rotation
Over time, log files may become very large. GFI MailEssentials enables log rotation, where new log files are created periodically or when the log file reaches a specific size.
To enable log file rotation:
1.
Go to Anti-Spam > Anti-Spam Settings .
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Screenshot 89: Log file rotation
2.
From the Anti-spam logging tab, select Enable log file rotation and specify the rotation condition ( by size or by time ).
3.
Provide the size or time values and click Apply .
5.6.2 Anti-Spam Global Actions
A lot of spam is sent to email addresses that no longer exist. Generally, these emails are simply deleted however for troubleshooting or evaluation purposes, you might want to move these emails to a folder or forward them to a particular email address.
NOTE
This section only applies for installations on Microsoft
®
Exchange Server that have spam action Move to subfolder of user’s mailbox enabled.
For more information, refer to Spam Actions - What to do with spam emails (page
On other mail servers, the anti-spam global actions tab will not appear.
Configuring Anti-spam global actions
1.
Go to Anti-Spam > Anti-Spam Settings .
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Screenshot 90: Global actions
2.
Select Global Actions tab and choose whether to:
Delete the email
Forward it to an email address
Move it to a specified folder.
3.
Select Log occurrence to this file to log these occurrences to a log file.
4.
Click Apply .
5.6.3 DNS Server Settings
DNS Server settings are very important in GFI MailEssentials since a number of anti-spam filters, such as IP DNS Blocklist,
URI DNS Blocklist and SpamRazer, perform domain lookups when filtering spam. It is critical for the performance of GFI
MailEssentials to have quick and reliable DNS lookups. DNS problems can cause slow processing of emails and a decreased spam catching rate.
NOTE
Usage of Google DNS is known to cause slow processing of emails and a decreased spam catching rate. It is recommended to NOT use Google DNS (IPv4 8.8.8.8
or 8.8.4.4
or IPv6 2001:4860:4860::8888 or
2001:4860:4860::8844 ).
To configure DNS:
1.
From the GFI MailEssentials Configuration, go to Anti-Spam > Anti-Spam Settings .
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Screenshot 91: DNS server settings
1.
From the DNS Server tab configure:
Option
Use the DNS server configured for this computer to use
Use the following DNS server
Description
Select this option to use the same DNS server that is used by the operating system where GFI MailEssentials is installed.
Select this option to specify a DNS server that is different than the one used by the local machine.
2.
Click Test DNS Server to test connectivity with the specified DNS server. If unsuccessful, specify another DNS server.
3.
Click Apply .
5.6.4 Remote Commands
Remote commands facilitate adding domains or email addresses to the Email Blocklist/Whitelist, as well as update the
Bayesian filter with spam or ham (valid emails).
Remote commands work by sending an email to GFI MailEssentials. Addressing an email to [email protected]
(configurable) will have GFI MailEssentials recognize the email as containing remote commands and processes them as described below.
With remote commands, the following tasks can be achieved:
1.
Add Spam or ham to the Bayesian Analysis database.
2.
Add keywords either to the subject keyword checking feature or to the body keyword checking feature.
3.
Add email addresses to the Email Blocklist filter and Whitelist.
Configuring remote commands
1. Click Anti-Spam > Anti-Spam Settings , go to Remote Commands tab and select Enable remote commands .
2. Edit the email address to which remote commands should be sent to.
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NOTE
The email address should NOT be a local domain. The default address is [email protected]
. A mailbox for the configured address does not need to exist, but the domain-part of the address must consist of a real email address domain that returns a positive result to an MX-record lookup via DNS. This can also be a public email account that you can manage (for example Gmail or Yahoo mail)
3. Optionally, configure some basic security for remote commands:
A shared password to include in the email.
For more information, refer to Using remote commands (page 139).
Which users are allowed to send emails with remote commands.
4. Click Apply .
Using remote commands
Remote commands can be sent via email to GFI MailEssentials from an email client within the domain. Conditions for sending remote commands:
The email must be in Plain Text format
The subject of the email is ignored
The following syntax must be used for all commands:
<command name>: <parameter1>, <parameter2>, <parameter3>, … ;
For example:ADDBLIST: [email protected];
There can be more than one command in the body of an email with each command separated by a semi-colon (;).
If a password is configured for remote commands, enter the password in the first line using the following syntax:
PASSWORD: <shared password>;
Command names are case-sensitive and should be written in UPPERCASE only.
Conditions such as IF, AND, OR are not supported.
Remote commands can only be used to add entries and not delete or modify existing entries.
Keyword commands
Use keyword commands to add keywords or combination of keywords in the body or subject lists in Keyword Checking filter.
Available commands are:
ADDSUBJECT - Adds keywords specified to the subject keyword checking database.
Example: ADDSUBJECT: sex, porn, spam;
ADDBODY - Adds keywords specified to the body keyword checking database.
Example: ADDBODY: free, “100% free”, “absolutely free”;
NOTE
When configuring phrases other than a single words, enclose them in double quotes (“ ”).
Blocklist commands
Use blocklist commands to add a single email address or an entire domain to the email blocklist.
Available commands are:
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ADDBLIST: <email>;
Example: ADDBLIST: [email protected];
NOTES
1. Add an entire domain to the blocklist by specifying a wildcard before the domain
Example : ADDBLIST: *@domain.com;
2. Wildcards cannot be used in domain names.
Example:ADDBLIST: *@*.domain.com; is invalid and will be rejected.
3. For security reasons, there can be only one ADDBLIST command in an email, and only one address can be specified as the command parameter. The parameter is either a user email or a domain:
Example:ADDBLIST: [email protected]; or ADDBLIST:*@spammers.org;
Bayesian filter commands
Add spam email or valid email (ham) to the Bayesian filter database. Available commands are:
Command
ADDASSPAM
ADDASGOODMAIL
Description
Instructs Bayesian filter to classify email as spam.
Instructs Bayesian filter to classify email as HAM.
NOTE
These commands do not have parameters - the content of the email is the parameter.
Remote command logging
To keep track of changes made to the configuration database via remote commands, each email with remote commands
(even if the email with remote commands was invalid) is saved in:
<GFI MailEssentials installation path> \GFI\MailEssentials\AntiSpam\ADBRProcessed\
The file name of each email is formatted according to the following format:
<sender_email_address>_SUCCESS_<timestamp>.eml
- in case of successful processing.
<sender_email_address>_FAILED_<timestamp>.eml
- in case of failure.
NOTE
Timestamp is formatted as yyyymmddhhmmss .
5.7 SpamTag for Microsoft Outlook
The GFI MailEssentials SpamTag Plugin is an addon for Microsoft Outlook that installs a toolbar on end users' machines, giving some control to users in management of spam emails. The plugin also synchronizes Microsoft Outlook Junk settings with GFI MailEssentials.
Whereas the Microsoft Outlook Junk functionality enables users to manage spam emails at client side, with the SpamTag plugin users can manage their spam emails at server level.
The GFI MailEssentials administrator can choose which of the following features and functions to enable:
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Train the Bayesian Analysis filter
Add senders and/or domains to Personal Blocklist or Personal Whitelist
Automatically synchronize allowed and blocked senders in Microsoft Outlook with the GFI MailEssentials Personal
Whitelist and Personal Blocklist respectively.
Automatically add users' contacts to the Personal Whitelist.
NOTE
Users assigned
to GFI MailEssentials are also allowed to add senders/domains to the GFI MailEssentials
Email Global Blocklist & Global Whitelist.
NOTE
When using SpamTag, install WCF HTTP Activation on the GFI MailEssentials server. To do this go to Server Manager
> Features > Add Feature > .NET Framework > WCF Activation > HTTP Activation .
5.7.1 Choosing SpamTag features
The GFI MailEssentials administrator can configure which features SpamTag users can make use of. For example, the administrator can enable users to add senders to personal whitelist, but disable adding of domains to the personal whitelist. SpamTag can also be configured to override the Microsoft Outlook Junk features.
To configure SpamTag features:
1.
Go to Anti-Spam > SpamTag .
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2.
From the Spam Button area configure the features related to false-negatives, that is, when spam emails are not detec ted as spam:
Option
Enable SPAM button
Move processed SPAM to Junk Email folder
Allow setting sender in Personal
Blocklist
Allow setting sender domain in Per sonal Blocklist
Description
The Spam button is shown in SpamTag and when clicked, the selected email trains the
Bayesian Analysis filter.
When clicking Spam, the selected email is automatically moved to the Microsoft Outlook
Junk E-mail folder.
A sub-option is shown under Spam button that enables users to add the sender's email address to their Personal Blocklist.
To use this option, the
must be enabled.
A sub-option is shown under Spam button that enables users to add the sender's domain to their Personal Blocklist.
To use this option, the
must be enabled.
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3.
From the Not Spam Button area configure the features related to false-positives, that is, when legitimate emails are incorrectly identified as spam.:
Option
Enable NOT SPAM button
Description
The Not Spam button is shown in SpamTag and when clicked, the selected email trains the Bayesian Analysis filter.
When clicking Not Spam, the selected email is automatically moved to the Inbox folder.
Move processed legitimate email to
Inbox folder
Allow setting sender in Personal Whitel ist
Allow setting sender domain in Per sonal Whitelist
Allow setting discussion list address in
Personal Whitelist
A sub-option is shown under Not Spam button that enables users to add the sender's email address to their Personal Whitelist.
To enable this option, the
must be enabled.
A sub-option is shown under Not Spam button that enables users to add the sender's domain to their Personal Whitelist.
To enable this option, the
must be enabled.
A sub-option is shown under Not Spam button that enables users to whitelist newsletters/discussion lists.
To enable this option, the
must be enabled.
4.
From the Advanced tab, configure the following advanced options.
Option
Import Outlook
Junk Settings to
Personal Blocklist and Personal
Whitelist
Import Outlook contacts to Per sonal Whitelist
Override
Microsoft
Outlook Junk
Hide the Console button
Description
Imports the addresses listed in Microsoft Outlook Safe Senders and Blocked Senders into the GFI MailEssentials
Personal Whitelist and Personal Blocklist.
The list of Safe Senders and Blocked Senders in Microsoft Outlook is available from Junk > Junk e-mail options.
NOTE: Imports are done automatically in the background by SpamTag every 2 hours and the user does not configure or see any options on screen.
NOTE: When the user uses Microsoft Outlook that is installed on a battery-powered device, such as a laptop or tablet, automatic synchronization is not done to economize on battery life.
Imports the list of Microsoft Outlook contacts to the Personal Whitelist.
NOTE: Imports are done automatically in the background by SpamTag every 2 hours and the user does not configure or see any options on screen.
NOTE: When the user uses Microsoft Outlook that is installed on a battery-powered device, such as a laptop or tablet, automatic synchronization is not done to economize on battery life.
When selecting this option, the options that are enabled in SpamTag override the equivalent settings in
Microsoft Outlook Junk, to ensure that only one anti-spam management system is utilized on client-side. When users use a Microsoft Outlook Junk option, a SpamTag function is run instead. For example if users click Never
Block Sender in Outlook Junk, the Not Spam function of SpamTag is run instead.
NOTE: If a particular option is not enabled in SpamTag and user utilizes the equivalent function in Outlook, no action is taken when the Outlook Junk function is used. For example, if Not Spam button is not enabled, nothing will happen when users click Never Block Sender.
Hides the Console button from the SpamTag toolbar. No direct access to the GFI MailEssentials console is provided but users can still log in by manually typing the URL in a browser. The settings provided to the user in the GFI MailEssentials console depend on Active Directory permissions or other custom Access Control settings.
For more information, refer to Access Control (page 218).
5.
Click Apply .
IMPORTANT
SpamTag checks which features are enabled or disabled in GFI MailEssentials when Microsoft Outlook starts. After changing any of the above settings, Microsoft Outlook needs to be restarted to apply changes.
5.7.2 SpamTag requirements
The machines where to install SpamTag must meet or exceed the following specifications:
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Hardware
Supported operating systems
Supported Microsoft Outlook sions
® Ver
Connection with GFI MailEssentials
Other software
Processor – 1Ghz or more
Memory – Minimum 512MB, Recommended 2GB
Physical Storage – 50MB physical storage dedicated for SpamTag
Windows
®
Windows ®
Windows ®
Windows
®
Windows
®
Windows ®
Windows ®
Windows
®
10
8 & 8.1
7
Vista
XP
Server 2012
Server 2008
Server 2003
Microsoft Outlook ®
Microsoft Outlook
®
Microsoft Outlook
®
Microsoft Outlook ®
Microsoft Outlook ®
2016
2013
2010
2007
2003
SpamTag connects with GFI MailEssentials on port 80 over HTTP.
To confirm connection, from the client's browser ensure that you can open the GFI
MailEssentials URL.
Microsoft .Net Framework 4 - this is downloaded and installed automatically if not found.
5.7.3 Installing SpamTag manually
Run the SpamTag installer on client's machines to manually install SpamTag.
1.
Get the installer from <GFI MailEssentials installation folder>/Outlook .
2.
Copy GFIMailEssentialsSpamTag.exe
to the machine where to install SpamTag.
3.
Close Microsoft Outlook.
4.
Right-click the installer and select Run as administrator .
5.
In the first screen, select the language for the installation.
GFI MailEssentials 5 Anti-Spam | 144
Screenshot 92: SpamTag installation language and license terms
6.
Read the License Terms and Conditions and if you agree, select I have read and agree to the License Terms and
Conditions . Click Next .
7.
Key in the URL used to connect to GFI MailEssentials. For example: http://192.168.1.2/MailEssentials or http://mygfiserver.mydomin.com/MailEssentials . Wait for the installer to verify connection with GFI MailEssentials via the specified URL and click Next .
8.
Specify the location where to install SpamTag and click Install .
9.
On completion click Finish .
10.
Start Microsoft Outlook and key in the user's credentials.
SpamTag is now available in the Microsoft Outlook Home ribbon (version 2007 onwards) or in the toolbar (version 2003).
For more information, click Help from SpamTag.
5.7.4 Installing SpamTag via GPO
This section will help you install GFI MailEssentials SpamTag on numerous machines automatically via GPO. Choose your domain controller environment:
Installing SpamTag via GPO on Windows Server 2008 & 2012
Step 1: Prepare MSI and ADM files
1.
From the GFI MailEssentials server, go to the GFI MailEssentials installation folder and open the Outlook sub-folder.
2.
Copy the MSI and the ADM files to a shared folder that is accessible by all users that will have SpamTag installed.
Ensure that users have at least Read permissions to the folder.
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Step 2: Deploy SpamTag
1.
On the domain controller, open Server Manager .
2.
Expand Server Manager > Features > Group Policy Management > Forest > Domains > domain name . Rightclick the domain name or an organizational unit and select Create a GPO in this domain, and Link it here...
3.
Enter a name for the new Group Policy Object (GPO). For example: GFI MailEssentials SpamTag . Click
OK .
4.
Right-click the newly created GPO and click Edit .
5.
In the Group Policy Management Editor window, expand Computer Configuration > Policies > Software settings
> Software Installation . Right click Software Installation > New > Package to configure the GPO to install on log in.
6.
Enter the network path of the shared folder that contains the SpamTag MSI package. Click OK .
NOTE
When selecting the location of the MSI file ensure that this is done through ‘My network locations’ so that the share name in GFI MailEssentials includes the full network share location rather than the local path.
7.
In the Deploy Software pop-up, select Assigned and click OK .
8.
The new package is now added under Software Installation .
9.
Right-click Computer Configuration > Policies > Administrative Templates and select All Tasks > Add/Remove
Templates .
10.
Click Add , browse to the shared folder containing spamtag.adm
.
11.
Click Close .
12.
Go to Computer Configuration > Policies > Administrative Templates > Classic Administrative Templates
(ADM) > GFI MailEssentials SpamTag .
13.
From the right pane, double click DefaultWebServiceUrl policy and select Enabled . In GFI MailEssentials Portal
Website Address key in the public url of GFI MailEssentials. Machines that will have SpamTag deployed must be able to connect to this url via their web browser, otherwise SpamTag will not be able to connect with GFI MailEssentials.
14.
Optionally, click Previous Setting to change the SpamTag default language. Click Enabled and modify the Default
Language value.
15.
Click OK .
Step 3: Verify installation
The set up should now be complete. SpamTag will be installed the next time each client machine is started.
To check installation, verify that the SpamTag toolbar is visible in Microsoft Outlook
®
GFI MailEssentials.
and that it connects successfully to
Installing SpamTag via GPO on Windows Server 2003
Step 1: Prepare MSI and ADM files
1.
From the GFI MailEssentials server, go to the GFI MailEssentials installation folder and open the Outlook sub-folder.
2.
Copy the MSI and the ADM files to a shared folder that is accessible by all users that will have SpamTag installed.
Ensure that users have at least Read permissions to the folder.
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Step 2: Deploy SpamTag
1.
From command prompt, load mmc.exe
to launch the Microsoft Management Console.
2.
Go to File > Add/Remove Snap-in… and click Add...
3.
Select Group Policy Object Editor snap-in and click Add .
4.
Click Browse… and select the domain policy to edit.
5.
Select the domain policy and click OK .
6.
Click Finish to close ‘Select Group Policy Object’ dialog. Click Close to close ‘Add standalone Snap-in’ dialog and click
OK to close ‘Add/Remove Snap-in’ dialog; to return to the Microsoft Management Console.
7.
Navigate to Console Root > <domain policy> > User Configuration , right-click Administrative Templates , and select Add/Remove Templates… .
8.
Click Add… and browse for the ADM file located in the folder shared in step 1. Click Open .
9.
Click Close to return to the Microsoft Management Console.
10.
Expand Console Root > <domain policy> > User Configuration > Administrative Templates > GFI Applications .
11.
From the right pane, double click DefaultWebServiceUrl policy and select Enabled . Key in the public url of GFI
MailEssentials. Machines that will have SpamTag deployed must be able to connect to this url via their web browser, oth erwise SpamTag will not be able to connect with GFI MailEssentials.
12.
Optionally, click Previous Setting to change the SpamTag default language. Click Enabled and modify the Default
Language value.
13.
Click OK .
14.
Select Console Root > <domain policy> > Computer Configuration > Software Settings .
15.
Right click Software installation and select New > Package…
16.
In the Open dialog, locate the share where the MSI file was saved in step 1.
NOTE
When selecting the location of the MSI file ensure that this is done through ‘My network locations’ so that the share name in GFI MailEssentials includes the full network share location rather than the local path.
17.
Choose the deployment option - select Assigned and OK .
Step 3: Verify installation
The set up should now be complete. SpamTag will be installed the next time each client machine is started.
To check installation, verify that the SpamTag toolbar is visible in Microsoft Outlook
®
GFI MailEssentials.
and that it connects successfully to
5.7.5 Using SpamTag
Screenshot 93: SpamTag in Microsoft Outlook 2010
For information on how to use SpamTag refer to the built-in help by clicking Help in SpamTag.
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The help automatically shows information related to the features that are enabled by the administrator in SpamTag settings page.
Screenshot 94: SpamTag in Microsoft Outlook 2003
5.8 Public Folder Scanning
Spamming techniques are continuously evolving and consequently you might encounter instances when spam still makes it through anti-spam filters to the recipient’s Inbox. Through public folder scanning, users can manually classify email as spam and ‘teach’ GFI MailEssentials spam patterns to classify similar email as spam. Emails can also be added to the whitelist.
IMPORTANT
It is highly recommended to use GFI MailEssentials SpamTag instead of Public Folder Scanning when network clients use Microsoft Outlook as their email client.
For more information, refer to SpamTag for Microsoft Outlook
How it works:
1. When an incorrectly classified email (false positive or false negative) is identified, users drag and drop the email to the appropriate GFI AntiSpam public folder.
For more information, refer to Using Public folder scanning (page 151).
2. Public folder scanning retrieves emails from the GFI AntiSpam public folders and adds them to the HAM/SPAM databases.
The GFI Antispam public folders must be created and configured on the mail server.
For more information, refer to
Enabling Public Folder Scanning (page 148).
5.8.1 Enabling Public Folder Scanning
To enable public folders scanning follow the instructions listed in the sections below:
Public folder scanning setup for Microsoft ® Exchange Servers
Configure a dedicated user account for Microsoft
Configure a dedicated user account for Microsoft ® Exchange 2003
Hiding user posts in GFI AntiSpam Folders
Public folder scanning setup for Microsoft
®
Exchange Servers
1.
From the GFI MailEssentials configuration console go to Anti-spam > Anti-Spam Settings . Select Public Folder Scan ning tab.
2.
Select Enable Public Folder Scanning and from Poll public folder via list select:
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Exchange Server 2003 - Select MAPI, IMAP or WebDAV.
Exchange Server 2007 - Choose WebDAV or Web Services.
Exchange Server 2010/2013/2016 - Choose Web Services.
Options are described in the table below.
Option
MAPI
IMAP
Description
To use MAPI, GFI MailEssentials must be installed on the machine on which Microsoft ®
No other settings are required.
Exchange Server is installed.
Requires Microsoft ® Exchange IMAP service. IMAP enables remote scanning of public folders and works well in environments running firewalls. In addition, IMAP can be used with other Mail servers that support IMAP.
Parameters required are:
Mail server name
Port number (default IMAP port is 143)
Username/password
Select the Use SSL option to use a secure connection
WebDAV Specify mail server name, port (default WebDAV port is 80), username/password and domain. To use a secure con nection select the Use SSL checkbox. By default, public folders are accessible under the ‘public’ virtual directory. If this has been changed, specify the correct virtual directory name to access the public folders by editing the text in the URL box.
Web Services Specify the following details:
Server - mail server name
Domain - use the local domain
®
NOTE: If both a local and a public domain exist, always use the local domain.
Port - default Web Services port (80, or 443 if using SSL).
Username/password - use credentials with administrative privileges or create a dedicated user from Microsoft
Exchange
®
Management Shell by entering the following command to add the appropriate permissions:
Add-ADPermission -identity "Mailbox Store" -User NewUser -AccessRights
GenericALL
Replace Mailbox Store with the name of the mailbox store that contains the user mailboxes and
NewUser with the username of the created user.
Use SSL - Select this option if Exchange Web Services require a secure connection. By default, Web Services requires SSL.
URL - By default, public folders are accessible under the ‘EWS/exchange.asmx’ virtual directory. If this has been changed, specify the correct virtual directory name to access the public folders by editing the text in the URL box.
NOTE: It is recommended to test the settings manually, by loading the URL in a web browser. This should load an
XML formatted file, named services.wsdl.
3.
Click Scan Now to automatically create the Public folders.
4.
Click Test if you are setting up IMAP, WebDAV or Web Services. On screen notification will confirm success/failure. If the test fails, verify/update credentials and re-test.
5.
Click Apply .
Configure a dedicated user account for Microsoft
®
Exchange Server 2007/2010/2013/2016
When configuring a dedicated user account to retrieve the emails from the GFI AntiSpam Public folders, the user would need to have ‘owner’ access rights on the GFI AntiSpam Public Folders.
1.
Create a new Active Directory (AD) (power) user.
2.
Logon to the Microsoft ® Exchange Server using administrative privileges.
3.
Open Microsoft ® Exchange Management Shell and key in following command:
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Get-PublicFolder -Identity "\GFI AntiSpam Folders" -Recurse | ForEach-Object
{Add-PublicFolderClientPermission -Identity $_.Identity -User "USERNAME" -
AccessRights owner -Server "SERVERNAME"}
Change USERNAME and SERVERNAME to the relevant details of the Active Directory user in question. Example:
Get-PublicFolder -Identity "\GFI AntiSpam Folders" -Recurse | ForEach-Object
{Add-PublicFolderClientPermission -Identity $_.Identity -User "mesuser" -
AccessRights owner -Server "exch07"}
Configure a dedicated user account for Microsoft
®
Exchange Server 2003
For security reasons, it is recommended that when GFI MailEssentials is installed in a DMZ, a dedicated user account is created to retrieve/scan emails from public folders.
1.
Create a new Active Directory (AD) user.
2.
From the Microsoft
®
Exchange System Manager, expand Folders > Public Folders node.
3.
Right click GFI AntiSpam Folders public folder and select Properties .
4.
Click Permissions tab and select Client permissions .
5.
Click Add… , select new user, and click OK .
6.
Select the new user from the client permissions list and from the provided list set its role to Owner . Ensure that all checkboxes are selected and the radio buttons are set to All .
7.
Click OK to finalize your configuration.
8.
From the Microsoft ® settings .
Exchange System Manager right click GFI AntiSpam Folders and select All tasks > Propagate
NOTE
For Microsoft
® option.
Exchange Server 2003 SP2, right click GFI AntiSpam Folders and select All tasks > Manage Settings
9.
Select Folder rights or Modify client permissions and click OK or Next .
10.
Specify the credentials of the new power user account created in step 1 and test the setup to ensure permissions are correct.
Hiding user posts in GFI AntiSpam Folders
For privacy and security purposes, it is highly recommended that you hide user posts made on GFI AntiSpam folders. This way, users will only be able to post to the folders without viewing existing posts (not even the ones they posted themselves). To configure user privileges and hide posts for unauthorized users:
Microsoft ® Exchange 2010
1.
From Microsoft
®
Exchange Management Shell, change the folder to the Microsoft
® be found in the Microsoft
®
Exchange installation folder. If Microsoft
®
Exchange scripts folder that can
Exchange is installed in the default path, the scripts folder is stored in:
C:\Program Files\Microsoft\Exchange Server\V14\Scripts\
2.
Key in the following command:
ReplaceUserPermissionOnPFRecursive.ps1 -Server "server" -TopPublicFolder "\GFI
AntiSpam Folders" -User "Default" -Permissions Contributor
Replace “ server ” with the full computer name.
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This command will set the default permissions for the GFI MailEssentials Public Folders to contributor, where users can move emails to the Public Folders but cannot view or modify entries. By default administrators are owners of the Public
Folders and can view or modify entries. For more information about Public Folders permissions refer to: http://go.gfi.com/?pageid=ME_PFPermissionsExch2010
Microsoft
®
Exchange 2007
1.
From Microsoft ® Exchange Management Shell , key in the following command:
ReplaceUserPermissionOnPFRecursive.ps1 -Server "server" -TopPublicFolder "\’GFI
AntiSpam Folders’" -User "Default" -Permissions Contributor
Replace “ server ” with the full computer name.
2.
When prompted, key in y to confirm permissions for each folder.
This command will set the default permissions for the GFI MailEssentials Public Folders to contributor, where users can move emails to the Public Folders but cannot view or modify entries. By default administrators are owners of the Public
Folders and can view or modify entries. For more information about Public Folders permissions refer to: http://go.gfi.com/?pageid=ME_PFPermissionsExch2007
Microsoft ® Exchange 2003
1.
From the Microsoft
®
Exchange System Manager expand Folders > Public Folders node.
2.
Right click GFI AntiSpam Folders public folder and select Properties .
3.
Select the Permissions tab and click Client permissions .
4.
Click Add… , and select the user/group to hide the posts from and click OK .
5.
Select user/group configured earlier to the client permissions list and set its role to Contributor .
6.
Ensure that only Create items is selected and the radio buttons are set to None .
7.
Click OK to finalize your configuration.
8.
From the Microsoft
® settings .
Exchange System Manager right click GFI AntiSpam Folders and select All tasks > Propagate
9.
Select Folder rights checkbox and click OK .
5.8.2 Using Public folder scanning
Reviewing spam email
1. When spam emails are delivered to the user’s mailbox (in Inbox, Junk E-mail folder or a custom folder) instruct the individual email users to periodically review spam emails.
2. There may be cases where legitimate emails are incorrectly identified as spam (false positives).
For more information, refer to Managing legitimate email (page 151).
3. There may also be cases where spam emails are not detected (false negatives).
For more information, refer to
Managing legitimate email
As with any anti-spam solution, GFI MailEssentials might require some time until the optimal anti-spam filtering conditions are achieved. In cases where this is not yet achieved, there might be instances where legitimate email is identified as spam.
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In such cases users should add emails incorrectly identified as spam to Add to whitelist and This is legitimate email folders to ‘teach’ GFI MailEssentials that the email in question is not spam.
NOTES
1. In Microsoft
®
Outlook, dragging and dropping email moves the email to the selected folder. To retain a copy of the email, hold down the CTRL key to copy the email rather than moving it.
2. Detailed information how to create the GFI AntiSpam folders is included in this manual.
For more information, refer to Enabling Public Folder Scanning (page 148).
Adding senders to the whitelist
1. In the public folders list of the mail client (example, Microsoft
® whitelist public folder.
Outlook), locate the GFI AntiSpam Folders > Add to
2. Drag and drop emails or newsletters to Add to whitelist public folder.
Adding discussion lists to the whitelist
Emails sent to discussions lists have the discussion list's email address as the recipient of the message. To receive emails from specific discussion lists, the list's email address needs to be whitelisted.
1. Using your email client, (example, Microsoft ® public folder.
Outlook), locate the GFI AntiSpam Folders > I want this Discussion list
2. Drag and drop discussion lists to the I want this Discussion list public folder.
Using legitimate emails to train the Bayesian filter
1. In the public folders of the mail client (example, Microsoft
® legitimate email public folder.
Outlook), locate the GFI AntiSpam Folders > This is
2. Drag and drop emails to the This is legitimate email folder.
Managing spam
While GFI MailEssentials starts identifying spam emails right out of the box, there may be instances where spam makes it through undetected to the users mailbox. Typically this might be either due to configuration settings that have not yet been performed or to new forms of email spam to which GFI MailEssentials has not yet adapted itself. In both cases, these situations are resolved when GFI MailEssentials is configured to capture such spam.
In these cases users should add such emails to Add to blocklist
MailEssentials that the email in question is spam.
and This is spam email folders to ‘teach’ GFI
NOTES
1. In Microsoft
®
Outlook, dragging and dropping email moves the email to the selected folder. To retain a copy of the email, hold down the CTRL key to copy the email rather than moving it.
2. Detailed information how to create the GFI AntiSpam folders is included in this manual.
For more information, refer to Enabling Public Folder Scanning (page 148).
Adding senders to the Email Blocklist
1. In the public folders of the mail client (example, Microsoft ® Outlook), locate the blocklist public folder.
GFI AntiSpam Folders > Add to
2. Drag and drop emails to the Add to blocklist public folder.
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Use spam emails to 'teach' the Bayesian filter
1. In the public folders of the mail client (example, Microsoft
® email public folder.
Outlook), locate the GFI AntiSpam Folders > This is spam
2. Drag and drop the spam email to the This is spam email folder.
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6 Content Filtering
Content Filtering engines enable administrators to control the content of emails. These engines scan the content of emails and attachments, and block emails containing content matching the content filtering rules.
Topics in this chapter:
6.3 Advanced Content Filtering
6.1 Keyword Filtering
Keyword Filtering enables you to set up rules that filter emails with particular keywords or a combination of keywords in the body or subject of the email. A rule is composed of:
Keywords to block in the email body, subject or attachment
Actions to take when a keyword is found
The users to which a rule applies.
To configure content rules, navigate to enable, disable or delete rules.
Content Filtering > Keyword Filtering . This page allows you to view, create,
6.1.1 Creating a Keyword Filtering rule
To create a Keyword filtering rule follow the steps listed below:
Step 1: Configuring basic rule setting
Step 2: Configuring terms to block
Step 3: Configuring the actions to take on detected emails
Step 4: Specifying the users to whom to apply this rule
Step 1: Configuring basic rule settings
1.
Go to Content Filtering > Keyword Filtering and select Add Rule...
2.
Specify a name for the rule in the Rule name text box.
3.
Select whether to scan inbound, outbound and/or internal emails.
Option
Scan Inbound SMTP Email
Scan Outbound SMTP Email
Check Internal emails
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
Select this option to scan internal emails.
NOTE
This option is only available when GFI MailEssentials is installed on the Microsoft
® server
Exchange
GFI MailEssentials 6 Content Filtering | 154
4.
To block emails encrypted using PGP technology, select Block PGP encrypted emails.
NOTE
PGP encryption is a public-key cryptosystem often used to encrypt emails.
Step 2: Configuring terms to block
1.
Select the Body tab to specify the keywords in the email body to block.
2.
Select Block emails if content is found matching these conditions (message body/attachments) checkbox to enable scanning of body for keywords.
GFI MailEssentials 6 Content Filtering | 155
Screenshot 95: Content Filtering: Body Tab - setting conditions
3.
From the Condition entry area, key in keywords to block in the Edit condition box. You can also use conditions AND ,
OR , AND NOT and OR NOT to use a combinations of keywords.
4.
To add the keyword or combination of keywords keyed in, click Add Condition .
To modify an entry in the remove an entry from the
Conditions list, select it and make the required changes in the Condition entry box. To
Conditions list, select it and click Remove .
Click Update to apply changes.
GFI MailEssentials 6 Content Filtering | 156
Screenshot 96: Content Filtering: Body Tab- configuring other options
5.
(Optional) From the Options area, configure the following settings:
Option
Match whole words only
Apply above con ditions to attach ments
Description
Block emails when the keywords specified match whole words.
Select this option to apply this rule also to text in attachments. In the Attachment filtering area specify the attachments' file extension (for example, .doc) to apply or exclude from this rule.
6.
Select the Subject tab to specify keywords to block in the email subject.
7.
From the Condition entry area, key in keywords to block in the Edit condition box. You can also use conditions AND ,
OR , AND NOT and OR NOT to use a combinations of keywords.
8.
To add the keyword or combination of keywords keyed in, click Add Condition .
To modify an entry in the Conditions list, select it and make the required changes in the Condition entry box. To remove an entry from the Conditions list, select it and click Remove .
Click Update to apply changes.
9.
From the Options area, configure how keywords are matched. Select Match whole words only to block emails where the keywords specified match whole words in the subject
Step 3: Configuring the actions to take on detected emails
1.
Click the Actions tab to configure what should be done when this rule is triggered.
2.
To block an email that matches the rule conditions, select Block email and perform this action and select one of the following options:
GFI MailEssentials 6 Content Filtering | 157
Option
Quarantine email
Delete email
Move to folder on disk
Description
Stores blocked emails in the Quarantine Store. You can subsequently review (approve/delete) all the quarantined
emails. For more information, refer to Quarantine (page 177).
Deletes blocked emails.
Moves the email to a folder on disk. Key in the full folder path where to store blocked emails.
IMPORTANT
Actions always affect the whole email containing the blocked content, even if there is other content (such as attachments) that do not trigger this rule.
NOTE
When GFI MailEssentials is installed on same machine as Microsoft ® Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
3.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients but with the malicious content removed.
4.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
5.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Step 4: Specifying users to whom this rule applies
1.
By default, the rule is applied to all email users. GFI MailEssentials, however, allows you to apply this rule to a custom list of email users specified in the Users / Folders tab.
2.
Specify the users to apply this rule to.
Option
Only this list
Description
Apply this rule to a custom list of email users, groups or public folders.
All except this list Apply this rule to all email users except for the users, groups or public folders specified in the list.
3.
To add email users, user groups and/or public folders to the list, click Add .
GFI MailEssentials 6 Content Filtering | 158
Screenshot 97: Add users to a Content Filtering rule
4.
In the User Lookups window, specify the name of the email user/user group or public folder that you wish to add to the list and click Check Names . Matching users, groups or public folders are listed underneath.
NOTE
You do not need to input the full name of the users, groups or public folder. It is enough to enter part of the name.
GFI MailEssentials will list all the names that contain the specified characters. For example, if you input sco , GFI
MailEssentials will return names such as Scott Adams and Freeman Prescott , if they are available.
5.
Select the check box next to the name(s) that you want to add to the list and click OK .
NOTE
To remove entries from the list, select the user/user group/public folder you want to remove and click Remove .
6.
Repeat steps 3 to 5 to add all the required users to the list.
7.
Click Apply .
6.1.2 Enabling/disabling Rules
To enable/disable content filtering rules:
1.
Go to Content Filtering > Keyword Filtering .
2.
From the Content Filtering page, select the checkbox of the rule(s) to enable or disable.
3.
Click Enable Selected or Disable Selected accordingly
6.1.3 Removing content filtering rules
WARNING
Deleted rules are not recoverable. If in doubt, it is recommended to disable a rule.
1.
Go to Content Filtering > Keyword Filtering .
2.
From the Content Filtering page, select the checkbox of the rule(s) that you want to remove.
3.
Click Remove Selected .
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6.1.4 Modifying an existing rule
1.
Go to Content Filtering > Keyword Filtering .
2.
From the Content Filtering page, click the name of the rule to modify.
3.
Perform the required changes in the rule properties and click Apply .
6.1.5 Changing rule priority
Content Filtering rules are applied in the same order, from top to bottom as they are listed in the Content Filtering page
(that is, rule with priority value 1 is checked first). To change the sequence/priority of rules:
1.
Go to Content Filtering > Keyword Filtering .
2.
From the Content Filtering page, click the (up) or (down) arrows to respectively increase or decrease the priority of the selected rule.
3.
Repeat step 2 until rules are placed in the desired sequence.
6.2 Attachment Filtering
Attachment Filtering allows you to set up rules to filter what types of email attachments to allow and block on the mail server. A rule is composed of:
Attachment types to block
Actions to take when a matching attachment is found
The users to which a rule applies.
To configure attachment rules, navigate to Content Filtering > Attachment Filtering . This page allows you to view, create, enable, disable or delete rules.
6.2.1 Creating an Attachment Filtering rule
To create an Attachment filtering rule follow the steps listed below:
Step 1: Configuring basic rule settings and the terms to block
Step 2: Configuring the actions to take on detected emails
Step 3: Specifying the users to whom to apply this rule
Step 1: Configuring basic rule settings and the terms to block
1.
Navigate to Content Filtering > Attachment Filtering node .
2.
Click Add Rule...
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Screenshot 98: Attachment Filtering: General Tab
3.
Specify a name for the rule in the Rule name text box.
4.
Select whether to scan inbound, outbound and/or internal emails.
Option
Scan Inbound SMTP Email
Scan Outbound SMTP Email
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
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Option
Check Internal emails
Description
Select this option to scan internal emails.
NOTE
This option is only available when GFI MailEssentials is installed on the Microsoft
® server
Exchange
5.
In the Attachment Blocking area, specify the types of attachments to block:
Option
Block all
Block this list
Do not block attach ments smaller than the following size:
Block all except this list
Description
Block all email attachments of any type.
Block a custom list of attachment types. Key in a filename and/or attachment type to block in the Enter file
name with optional wildcards text box and click Add. Repeat this step for all filenames and/or attachment types to block.
Select this option to allow attachment types in the list that are smaller than a particular size. Specify the size (in KB) in the text box provided.
Block all attachments except the ones specified in the list. Key in a filename and/or attachment type to allow in the Enter filename with optional wildcards text box and click Add. Repeat this step for all file names and/or attachment types to exclude.
NOTE
When specifying filenames and/or attachment types, you can use asterisk (*) wildcards. For example, specifying
*orders*.mdb
refers to all files of type mdb that contain the string orders in the file name. Specifying
*.jpg
will block all images of type jpg .
NOTE
To remove an entry from the list, select it and click Remove Selected .
6.
You can also block attachments that have a size bigger than a particular size. To enable this option, from the Options area select Block all attachments greater than the following size and specify the maximum attachment size (in KB).
NOTE
This feature blocks all attachments with a file size bigger than the one specified irrespective if the attachment matches an entry in the Attachment blocking list.
Step 2: Configuring the actions to take on detected emails
1.
Click the Actions tab to configure what happens when this rule is triggered.
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Screenshot 99: Attachment Filtering: Actions Tab
2.
To block an email that matches the rule conditions, select Block attachment and perform this action and select one of the following options:
Option
Quarantine email
Delete email
Move to folder on disk
Description
Stores blocked emails in the Quarantine Store. You can subsequently review (approve/delete) all the quarantined
emails. For more information, refer to Quarantine (page 177).
Deletes blocked emails.
Moves the email to a folder on disk. Key in the full folder path where to store blocked emails.
IMPORTANT
Actions always affect the whole email containing the blocked content, even if there is other content (such as attachments) that do not trigger this rule.
NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
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3.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients but with the malicious content removed.
4.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
5.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Step 3: Specifying users to whom this rule applies
1.
By default, the rule is applied to all email users. GFI MailEssentials, however, allows you to apply this rule to a custom list of email users specified in the Users / Folders tab.
2.
Specify the users to apply this rule to.
Option
Only this list
Description
Apply this rule to a custom list of email users, groups or public folders.
All except this list Apply this rule to all email users except for the users, groups or public folders specified in the list.
3.
To add email users, user groups and/or public folders to the list, click Add .
Screenshot 100: Add users to a Content Filtering rule
4.
In the User Lookups window, specify the name of the email user/user group or public folder that you wish to add to the list and click Check Names . Matching users, groups or public folders are listed underneath.
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NOTE
You do not need to input the full name of the users, groups or public folder. It is enough to enter part of the name.
GFI MailEssentials will list all the names that contain the specified characters. For example, if you input sco , GFI
MailEssentials will return names such as Scott Adams and Freeman Prescott , if they are available.
5.
Select the check box next to the name(s) that you want to add to the list and click OK .
NOTE
To remove entries from the list, select the user/user group/public folder you want to remove and click Remove .
6.
Repeat steps 3 to 5 to add all the required users to the list.
7.
Click Apply .
6.2.2 Enabling/disabling rules
To enable or disable attachment filtering rules:
1.
Go to Content Filtering > Attachment Filtering .
2.
From the Attachment Filtering page, select the checkbox of the rule(s) to enable or disable.
3.
Click Enable Selected or Disable Selected accordingly.
6.2.3 Removing attachment rules
Warning
Deleted rules are not recoverable. If in doubt, it is recommended to disable a rule.
1.
Go to Content Filtering > Attachment Filtering .
2.
From Attachment Filtering page, select the rule(s) that you want to remove.
3.
Click Remove Selected .
6.2.4 Modifying an existing rule
1.
Go to Content Filtering > Attachment Filtering .
2.
From Attachment Filtering page, click the name of the rule to modify.
3.
Perform the required changes in the rule properties and click Apply .
6.2.5 Changing the rule priority
Attachment Filtering rules are applied in the same order, from top to bottom as they are listed in the Attachment
Filtering page (that is, rule with priority value 1 is checked first). To change the sequence/priority of rules:
1.
Go to Content Filtering > Attachment Filtering .
2.
From the Attachment Filtering page, click the (up) or (down) arrows to respectively increase or decrease the pri ority of the selected rule.
3.
Repeat step 2 until rules are placed in the desired sequence.
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6.3 Advanced Content Filtering
Advanced Content filtering enables scanning of email header data and content using advanced configurable search conditions and regular expressions (regex).
To configure advanced content rules, go to view, create, enable, disable or delete rules.
Content Filtering > Advanced Content Filtering . This page allows you to
6.3.1 Creating Advanced Content Filtering rules
To create an Advanced Content Filtering rule follow the steps listed below:
Step 1: Configuring basic rule settings and conditions to block
Step 2: Configuring the actions to take on detected emails
Step 3: Specifying the users to whom to apply this rule
Step 1: Configuring basic rule settings and conditions to block
1.
Go to Content Filtering > Advanced Content Filtering and click Add Rule...
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Screenshot 101: Adding a new Advanced Content Filtering rule
2.
In Rule Name area, provide a name for the new rule.
3.
In Condition area, provide the condition that the email has to meet to match this rule. From the drop down select the email part ( Headers , Subject , Body , Attachment Name or Attachment Content ) and choose a condition ( Start with ,
Ends with , Contains , Matches Exactly , Matches Regex ). In the text box, key in the keyword or regular expression that the email should match.
For example: To match emails having swiss in subject - Select Subject and Contains and key in swiss in textbox.
4.
Select whether to scan inbound, outbound and/or internal emails.
Option
Scan Inbound SMTP Email
Scan Outbound SMTP Email
Check Internal emails
Description
Select this option to scan incoming emails
Select this option to scan outgoing emails
Select this option to scan internal emails.
NOTE
This option is only available when GFI MailEssentials is installed on the Microsoft ® server
Exchange
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Step 2: Configuring the actions to take on detected emails
1.
From the Actions tab, configure what happens when this rule is triggered.
Screenshot 102: Actions Tab
2.
To block an email that matches the rule conditions, select Block email and perform this action and select one of the following options:
Option
Quarantine email
Delete email
Move to folder on disk
Description
Stores blocked emails in the Quarantine Store. You can subsequently review (approve/delete) all the quarantined
emails. For more information, refer to Quarantine (page 177).
Deletes blocked emails.
Moves the email to a folder on disk. Key in the full folder path where to store blocked emails.
IMPORTANT
Actions always affect the whole email containing the blocked content, even if there is other content (such as attachments) that do not trigger this rule.
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NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
3.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients but with the malicious content removed.
4.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
5.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
Step 3: Specifying users to whom this rule applies
1.
By default, the rule is applied to all email users. GFI MailEssentials, however, allows you to apply this rule to a custom list of email users specified in the Users / Folders tab.
2.
Specify the users to apply this rule to.
Option
Only this list
Description
Apply this rule to a custom list of email users, groups or public folders.
All except this list Apply this rule to all email users except for the users, groups or public folders specified in the list.
3.
To add email users, user groups and/or public folders to the list, click Add .
Screenshot 103: Add users to a Content Filtering rule
4.
In the User Lookups window, specify the name of the email user/user group or public folder that you wish to add to the list and click Check Names . Matching users, groups or public folders are listed underneath.
GFI MailEssentials 6 Content Filtering | 169
NOTE
You do not need to input the full name of the users, groups or public folder. It is enough to enter part of the name.
GFI MailEssentials will list all the names that contain the specified characters. For example, if you input sco , GFI
MailEssentials will return names such as Scott Adams and Freeman Prescott , if they are available.
5.
Select the check box next to the name(s) that you want to add to the list and click OK .
NOTE
To remove entries from the list, select the user/user group/public folder you want to remove and click Remove .
6.
Repeat steps 3 to 5 to add all the required users to the list.
7.
Click Apply .
6.3.2 Removing Rules
1.
From Content Filtering> Advanced Content Filtering , select rule to remove.
2.
Click Remove Selected .
6.3.3 Enabling/Disabling Rules
1.
From Content Filtering> Advanced Content Filtering , select rule to enable/disable.
2.
Click Disable Selected to disable rule or Enable Selected to enable.
6.3.4 Sorting Rules
Advanced Content Filtering rules are applied in the same order, from top to bottom as they are listed in the Advanced
Content Filtering page (that is, rule with priority value 1 is checked first). To change the sequence/priority of rules:
1.
Navigate to the Content Filtering > Advanced Content Filtering node.
2.
Click the (up) or (down) arrows to respectively increase or decrease the priority of the rule.
3.
Repeat step 2 until rules are placed in the desired sequence.
6.4 Decompression Engine
The Decompression engine extracts and analyzes archives (compressed files) attached to an email.
The following is a list of checks performed by the decompression engine:
Password protected archives
Corrupted archives
Recursive archives
Size of decompressed files in archives
Amount of files in archives
Scan within archives
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6.4.1 Configuring the decompression engine filters
Screenshot 104: Decompression engine checks
To configure decompression engine filters:
Check password protected archives
Check size of uncompressed files in archives
Check for amount of files in archives
Check password protected archives
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Check password protected archives .
3.
To enable this filter, select Check password protected archives .
4.
Specify what to do when an email contains an archive that triggers this filter:
Option
Quarantine
Automatically Delete
Description
Quarantines blocked emails
Deletes blocked emails
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NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
5.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients.
6.
Click the Actions tab to configure further actions.
7.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
8.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
9.
Click Apply .
Check corrupted archives
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Check corrupted archives .
3.
To enable this filter select Check corrupted archives .
4.
Specify what to do when an email contains an archive that triggers this filter:
Option
Quarantine
Automatically Delete
Description
Quarantines blocked emails
Deletes blocked emails
NOTE
When GFI MailEssentials is installed on same machine as Microsoft ® Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
5.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients.
6.
Click the Actions tab to configure further actions.
7.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
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Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
8.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
9.
Click Apply
Check for recursive archives
This filter allows you to quarantine or delete emails that contain recursive archives. Recursive archives, also known as nested archives, are archives that contain multiple levels of sub-archives (that is, archives within archives). A high number of archive levels can indicate a malicious archive. Recursive archives can be used in a DoS (Denial of Service) attack, since recursive archives consume machine resources when they are being analyzed. To configure this filter:
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Check for recursive archives .
3.
To enable this filter select Check for recursive archives .
4.
Specify the maximum number of recurring archives in the Maximum number of recurring archives text box. If an archive contains more recurring archives than the specified number, the email is triggered as malicious.
5.
Specify what to do when an email contains an archive that triggers this filter:
Option
Quarantine
Automatically Delete
Description
Quarantines blocked emails
Deletes blocked emails
NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
6.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to forward a copy of the blocked email to the recipients but with the malicious content removed.
7.
Click the Actions tab to configure further actions.
8.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
9.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
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<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
10.
Click Apply .
Check size of uncompressed files in archives
This filter allows you to block or delete emails with archives that exceed the specified physical size when uncompressed.
Hackers sometimes use this method in a DoS (Denial of Service) attack by sending an archive that can be uncompressed to a very large file that consumes hard disk space and takes a long time to analyze by content security or antivirus software.
To configure this filter:
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Check size of uncompressed files in archives .
3.
To enable this filter select Check size of uncompressed files in archives .
4.
Specify the maximum size of uncompressed archives in the Maximum size of uncompressed files in archive in MB text box. If an uncompressed archive’s size is bigger than the specified value, the email is triggered as malicious.
5.
Specify what to do when an email contains an archive that triggers this filter:
Option
Quarantine
Automatically Delete
Description
Quarantines blocked emails
Deletes blocked emails
NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
6.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients but with the malicious content removed.
7.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
8.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
9.
Click Apply .
Check for amount of files in archives
This filter allows you to quarantine or delete emails that contain an excessive amount of compressed files within an attached archive. You can specify the number of files allowed in archive attachments from the configuration options
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included in this filter. To configure this filter:
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Check for amount of files in archives .
3.
To enable this filter select Check for amount of files in archives .
4.
Specify the maximum number of files in archives in the If the number of files within archive exceeds text box. If the archive contains more files than the specified value, the email is triggered as malicious.
5.
Specify what to do when an email contains an archive that triggers this filter:
Option
Quarantine
Automatically Delete
Description
Quarantines blocked emails
Deletes blocked emails
NOTE
When GFI MailEssentials is installed on same machine as Microsoft
®
Exchange 2003, GFI MailEssentials may not be able to block outbound emails, but instead replaces the blocked content with a threat report.
6.
Select Send a sanitized copy of the original email to recipient(s) to choose whether to send a copy of the blocked email to the recipients.
7.
Click the Actions tab to configure further actions.
8.
GFI MailEssentials can send email notifications whenever an email triggers this filter. To enable this feature, select any of the following options:
Option
Notify admin istrator
Notify local user
Description
Notify the email local recipients about the blocked email.
9.
To log the activity of this engine to a log file select Log rule occurrence to this file . In the text box specify path and file name to a custom location on disk where to store the log file. By default, log files are stored in:
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\Logs\<EngineName>.log
10.
Click Apply .
Scan within archives
You can configure GFI MailEssentials to apply Keyword and Attachment Filtering of files within archives.
1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the list of available filters, click Scan within archives .
3.
To enable scanning within archives select Apply Attachment and Content Filtering rules within archives .
For more information, refer to Content Filtering (page 154).
4.
Click Apply .
6.4.2 Enable/disable decompression filters
To enable or disable decompression filters:
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1.
Navigate to Content Filtering > Decompression Engine node.
2.
From the Decompression engine page, select the checkbox of the filters to enable or disable.
3.
Click Enable Selected or Disable Selected accordingly.
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7 Quarantine
The GFI MailEssentials Quarantine feature provides a central store where all emails detected as spam or malware are retained. This ensures that users do not receive spam and malware in their mailbox and processing on the mail server is reduced.
Administrators and mail users can review quarantined emails by accessing the quarantine interface from a web browser.
GFI MailEssentials can also send regular email reports to email users to review their blocked emails.
Refer to the following sections for more information on configuring the GFI MailEssentials Quarantine.
7.4 Working with Quarantined emails
7.7 Quarantine Store Location and Public URL
7.1 Important Notes
1.
To quarantine spam or malicious emails, change the filters' and engines' actions to Quarantine email .
2.
The Quarantine Store requires disk space to retain the organization’s spam email or malware for a number of days. The amount of disk space required depends on:
The quantity received
How long it is retained.
3.
On average, 100,000 spam or malware emails of 5 KB each will require approximately 600 MB of disk space to store the email and its metadata.
4.
If the free disk space where the Quarantine Store is saved is 512 MB or less, GFI MailEssentials stops quarantining spam and malware; it is instead tagged and delivered to recipients’ mailboxes until free disk space increases to more than 512 MB. This ensures that the disk will not run out of space.
7.2 Searching the quarantine
The Quarantine Store is accessible from the GFI MailEssentials interface and allows management of quarantined emails.
To access the GFI MailEssentials Quarantine Store, go to GFI MailEssentials > Quarantine .
There are various ways how to search for content in the GFI MailEssentials Quarantine:
Searching though quarantined Malware and Spam
Searching through Malware emails only
Search through Spam emails only
Search through both Malware and Spam
1.
Go to GFI MailEssentials > Quarantine .
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Screenshot 105: Malware and Spam Search Area
2.
From the Quarantine page, select All Emails from Search for dropdown.
3.
Specify the required search criteria.
SEARCH CRITERIA
Date:
Search by sender
Search by recipient
Search for text in subject
DESCRIPTION
Select the date range when the email was quarantined. Available date ranges are:
Any date/time
Since yesterday
Last 7 days
Last 30 days
Custom date range
Specify a sender who sent the email that was quarantined.
Specify a recipient for whom an email was quarantined.
Specify the text to search for within quarantined email subject.
4.
Click Search .
NOTE
Use the search results to review quarantined emails. You can approve false positives for delivery to recipients.
For more information, refer to Working with Quarantined emails (page 184).
Search for Malware and Content only
1.
Go to GFI MailEssentials > Quarantine .
GFI MailEssentials 7 Quarantine | 178
Screenshot 106: Malware and Spam Search Area
2.
From the Quarantine page, select Malware and Content Only from Search for dropdown.
3.
Specify the required search criteria.
SEARCH CRITERIA DESCRIPTION
Date:
Search by sender
Search by recip ient
Search for text in subject
Select the date range when the email was quarantined. Available date ranges are:
Any date/time
Since yesterday
Last 7 days
Last 30 days
Custom date range
Specify a sender who sent the email that was quarantined.
Specify a recipient for whom an email was quarantined.
Specify the text to search for within quarantined email subject.
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SEARCH CRITERIA DESCRIPTION
Quarantine
Reason
Key in the reason for which the email to search for was quarantined.
Item Source
Item Direction
Select the source from where email was identified as Malware and quarantined. Available options are:
Information Store (VSAPI)
Gateway (SMTP)
Information Store (Transport)
Select the direction of the quarantined email to search for,
Any
Inbound
Outbound
NOTE
This option is available only if Gateway (SMTP) is selected in Item Source.
Quarantined by Select one of the GFI MailEssentials filters that quarantined the email. Select Only checkbox to search for emails quarantined only by a specific filter.
4.
Click Search .
NOTE
Use the search results to review quarantined emails. You can approve false positives for delivery to recipients.
For more information, refer to Working with Quarantined emails (page 184).
Search for Spam Only
1.
Go to GFI MailEssentials > Quarantine .
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Screenshot 107: Spam Only search area
2.
From the Quarantine page, select Spam Only from Search for dropdown.
3.
Specify the required search criteria. Available options are:
SEARCH CRITERIA
Date:
Search by sender
DESCRIPTION
Select the date range when the email was quarantined. Available date ranges are:
Any date/time
Since yesterday
Last 7 days
Last 30 days
Custom date range
Specify a sender who sent the email that was quarantined.
Search by recipient
Search for text in subject
Specify a recipient for whom an email was quarantined.
Specify the text to search for within quarantined email subject.
Search by anti-spam filter Select the anti-spam filter that identified the email to search for as Spam.
4.
Click Search .
NOTE
Use the search results to review quarantined emails. You can approve false positives for delivery to recipients.
For more information, refer to Working with Quarantined emails (page 184).
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7.3 Search Folders
A Search Folder is a folder that has a custom search query associated to it and displays all quarantined emails that match the search query.
Examples of search folders:
A search folder that displays only outbound emails quarantined by the Virus Scanning Engines.
A search folder that displays inbound emails quarantined in a particular date range and addressed to a particular user.
A search folder that displays emails that meet specific search criteria
A search folder that displays the results of a previously defined search query.
To display emails in a particular search folder:
1.
Go to Quarantine node.
Screenshot 108: Default and custom search folders
2.
Click a search folder displayed in the Default Search Folders or Custom Search Folders areas. Alternatively, select one of the search folder nodes under the Quarantine and Quarantine > Search Folders node.
NOTE
Use the search results to review quarantined emails. You can approve false positives for delivery to recipients.
For more information, refer to Working with Quarantined emails (page 184).
7.3.1 Default Search Folders
Default Search Folders are preconfigured search folders that enable you to access quarantined emails according to specific time periods or by a specific quarantined email type. To use the default search folders:
1.
Go to Quarantine node.
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Screenshot 109: Default search folders
2.
Select a search folder from the Default Search Folders area or from a node beneath Quarantine node to access the search folder. GFI MailEssentials will automatically search for and display all quarantined emails that satisfy the default search folder search criteria.
Available default search folders are:
Time based:
Today
Yesterday
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This week
Category based:
All Malware and Content Items
All Spam Items
NOTE
Use the search results to review quarantined emails. You can approve false positives for delivery to recipients.
For more information, refer to Working with Quarantined emails (page 184).
7.3.2 Creating, editing and removing Custom Search Folders from Searches
1.
Go to Quarantine node.
2.
Create a new search for quarantined emails.
For more information, refer to Searching the quarantine (page 177).
3.
In the results page, click Save as Search Folder and key in an easily identifiable name for the new Search Folder.
The newly created search folder is listed in Quarantine > Search Folders node.
NOTE
To edit or delete a previously created search folder, access the search folder and click Edit Search Folder or Delete
Search folder .
7.3.3 Using the Search Folders node to auto-purge quarantined emails
The Search Folders node enables you to create Search folders and set an auto-purge value (in days).When a quarantined email exceeds the specified number of days in the quarantine, the email is deleted.
1.
Select Quarantine > Search Folders node.
2.
Configure a new search folder for the emails to purge on a regular basis using the instructions in this chapter.
3.
Select EnableAuto-purging and provide the number of days to keep emails for.
4.
Click Save Folder .
7.4 Working with Quarantined emails
Within GFI MailEssentials there are a number of actions you can take on quarantined emails.
The Quarantine Store is accessible from the GFI MailEssentials interface and the administrator can manage quarantined emails.
To access the GFI MailEssentials Quarantine Store, go to GFI MailEssentials > Quarantine .
7.4.1 Viewing quarantined emails
Searching within the Quarantine or using default or customized search folders yields a list of quarantined emails.
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Screenshot 110: Search Results
NOTE
The results page may be split in two tabs:
Malware and Content - Emails blocked by anti-malware engines and content filtering rules.
Spam - Emails blocked by anti-spam filters.
1.
Choose Malware and Content tab or Spam tab to view quarantined emails for the specific quarantined email type.
The results page provides the following functions and details:
Option
Back
Approve
Delete
Rescan
Module
Reason
Sender
Description
Returns you to the previous screen.
Rescans emails using current antivirus signatures (which may be more up to date than the antivirus signatures that quar antined the email in the first place). Select one or more emails and click Rescan to rescan.
The module that identified the email as to be quarantined.
The reason/rule that triggered the action to quarantine the email.
The email address of the sender
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Option Description
Recipients The email address of the recipient
Subject The email subject as sent by the sender.
Date
Source
Item
Source
The date when email was quarantined
The location from where the email was quarantined
Enables selecting a source to filter the display with. Available options are:
View all
Information Store (VSAPI)
Gateway (SMTP)
Information Store (Transport)
Page size Enables customizing how many emails per page are currently displayed. Choose a number to view a maximum num ber of items per page.
2.
Click a row to access the individual email details.
Screenshot 111: Quarantined Items details
From the Quarantined Items details page, review the email details and perform the following actions
Action
Approve
Sanitize and
Approve
Rescan
Description
Approve email. For more information, refer to Approving Quarantined Emails (page 187).
Sanitize email and approve. For more information, refer to Approving Quarantined Emails (page 187).
Rescans emails using current antivirus signatures (which may be more up to date than the antivirus signatures that quarantined the email in the first place).
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Action
Delete
Delete and
Notify
Download
Item
Description
Deletes email. For more information, refer to Permanently Delete Quarantined Emails (page 187).
Downloads quarantined email to a location you choose in .eml format.
Warning:
Emails in Quarantine Store may contain malicious content. Use this feature with caution.
7.4.2 Approving Quarantined Emails
There might be instances where you might want to approve an email blocked by GFI MailEssentials. GFI MailEssentials allows the administrator to approve a quarantined email so that it is released from the Quarantine Store and delivered to its intended recipients.
To approve emails:
1.
Use the search features described in the previous sections to return a list of quarantined emails.
2.
Select the checkbox next to the quarantined email(s) to approve and click Approve .
Sanitize and Approve Emails
GFI MailEssentials also enables you to remove the item that caused the email to be quarantined and send the email to recipient.
To sanitize and approve emails:
1.
Use the search features described in the previous sections to return a list of quarantined emails.
2.
Click on an email to view its details.
3.
Click Sanitize and Approve .
NOTE
Emails quarantined by the Information Store (VSAPI) source cannot be sanitized.
7.4.3 Permanently Delete Quarantined Emails
1.
Use the search features described in the previous sections to return a list of quarantined emails
2.
Select the checkbox next to the quarantined email(s) and click Delete .
Delete Quarantined Emails and notify user
The Delete and Notify feature enables notifying recipients when deleting emails from quarantine.
To delete and notify recipients:
1.
Use the search features described in the previous sections to return a list of quarantined emails.
2.
Click on an email to view its details.
3.
Click Delete and Notify .
7.5 Quarantine RSS Feeds
RSS (Really Simple Syndication) is a protocol used to distribute frequently updatable content or feeds (for example, news items) with its subscribers. An RSS Feed Reader is required by subscribers to view RSS feeds. RSS feeds usually include a
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summary of the content and a link to view the full article.
To facilitate the monitoring of quarantined emails, RSS feeds can be used. The GFI MailEssentials Quarantine RSS feed displays quarantined emails for review and enables users to approve or delete quarantined emails.
NOTE
GFI MailEssentials Quarantine RSS feeds can be used on most RSS Feed Readers. For a list of freely available RSS Feed
Readers that were tested with GFI MailEssentials Quarantine RSS feeds refer to: http://kbase.gfi.com/showarticle.asp?id=KBID002661
7.5.1 Enabling Quarantine RSS Feeds
1.
Navigate to GFI MailEssentials > Quarantine > Quarantine RSS Feeds .
Screenshot 112: Quarantine RSS feeds
2.
Select the Enable Quarantine RSS Feeds checkbox.
3.
From the RSS Feeds area, click Edit to the right of the quarantine search folder for which to enable RSS feeds.
4.
Select Enable Quarantine RSS feeds on this folder checkbox.
5.
Specify the refresh interval in minutes in the Refresh feed content every text box. The default value is 10 minutes.
6.
Specify the maximum number of items you want the feed to include in the Feed should contain at most text box.
The default value is 100 items.
NOTE
You can change the URL of an RSS feed by clicking Reset Feed URL . To change the URL of all enabled RSS feeds, click Edit to the right of the OPML present subscriptions accordingly.
entry and click Reset all the URLs . When changing URLs, ensure to update all
Reset feed url should be done in case of unauthorized access
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7.
Click Apply .
7.5.2 Subscribing to Quarantine RSS feeds
Subscribing to all enabled Quarantine RSS feeds
1. Navigate to GFI MailEssentials > Quarantine >Quarantine RSS Feeds .
2. In the RSS Feeds area, right-click on used) icon and choose to copy the link URL. (actual option depends on browser
3. Use the copied URL in your RSS Feed Reader application to create a new RSS feed subscription.
Subscribing to a search folder Quarantine RSS feed
To subscribe to an RSS feed of a default or custom search folder:
1. Navigate to GFI MailEssentials > Quarantine >Quarantine RSS Feeds .
2. In the RSS Feeds area, right-click on
URL. (option depends on browser used) icon next to the search folder to subscribe to and choose to copy the link
3. Use the copied URL in your RSS Feed Reader application to create a new RSS feed subscription.
7.5.3 Securing access to the GFI MailEssentials Quarantine RSS feeds
Configure who can subscribe to the quarantine RSS feeds from the Access Control node in GFI MailEssentials
Configuration.
For more information, refer to Access Control (page 218).
7.6 Quarantine Options
Use the Quarantine Options to configure spam retention, user quarantine reports, quarantined malware and emails sent to inexitent users.
7.6.1 Spam Options
1.
Navigate to Quarantine > Quarantine Options > Spam Options .
Screenshot 113: Spam Options - General Options tab
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2.
From the General Options tab change or confirm the Spam quarantine store email retention period.
3.
Click User Settings tab.
Screenshot 114: Spam Options - User Settings tab
4.
Select Send user quarantine reports at regular intervals to enable sending of User quarantine reports.
NOTE
User quarantine reports are emails sent to users on a regular basis with a list of blocked spam for that user. Using this list, users can check and approve any legitimate emails. Email blocked by the Malware and Content Filtering filters are not shown in these emails.
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5.
Configure the frequency at which report will be sent. To add to the preset schedule, select a date and time and click
Add rule.
Select an existing date and time and click Delete to delete selected date/time.
6.
Configure the users that will receive the Quarantined Spam reports. Select All Users except the ones listed below or
Only users in the list below and provide the email address of the users to include or exclude.
NOTE
Click Browse to select a file with a list of email addresses to import and click Import .
7.
Click Apply .
7.6.2 Malware Options
GFI MailEssentials can also be configured to notify the administrator or authorized users via email (Quarantine Action
Form) whenever an email is quarantined.
The Quarantine Approval Form contains details related to the quarantined email including the reason why it was blocked and any attachments that were included in the email. The administrator can then action the quarantined email
(for example, approve the email) directly from the email client.
NOTE
To automatically purge emails older than a specific number of days, create a new search folder and set the Autopurging feature to purge emails after a number of days.
Enabling Quarantine Approval Forms
1.
Navigate to Quarantine > Quarantine Options > Malware Options .
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Screenshot 115: Quarantine Mode
2.
From Quarantine Mode tab, select Send quarantine approval forms by email checkbox to enable the sending of
Quarantine Approval Forms.
3.
From the Select recipient area, specify the recipient of the Quarantine Approval Forms:
Option
Send to administrator
Send to the following email address
Description
Sends Quarantine Approval Forms to another email address. Key in the recipient in the text box provided.
4.
Optional - Select Save quarantine audit to this file and configure a filename where to save a copy of the quarantine log.
5.
Click Apply.
Nonexistent Recipients
The GFI MailEssentials Nonexistant recipients feature scans emails for non-existing local email addresses before these are stored to the Quarantine Store. If an email contains non-existing local email addresses, it is permanently deleted. This reduces the number of emails for administrative reviewing.
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Configuring Nonexistent Recipients
The Nonexistent Recipients filter requires access to the list of local addresses. This is done either via Active Directory or if communication with Active Directory is not possible, via an LDAP server.
1.
Navigate to Quarantine > Quarantine Options > Malware Options .
Screenshot 116: Nonexistent Recipients
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2.
From Nonexistent Recipients tab, select Delete quarantined emails for nonexistent recipients checkbox.
3.
Select the user lookups method to use:
Option
Use native
Active Dir ectory look ups
Description
Select this option if GFI MailEssentials is installed in Active Directory mode and has access to ALL users on Active
Directory. Skip to step 8.
NOTE
When GFI MailEssentials is installed in Active Directory user mode on a DMZ, the AD of a DMZ usually does not include all the network users (email recipients). In this case configure GFI MailEssentials to use LDAP lookups.
Use LDAP lookups
NOTE
WhenGFI MailEssentials is behind a firewall, this feature might not be able to connect directly to the internal
Active Directory because of Firewall settings. Use LDAP lookups to connect to the internal Active Directory of your network and ensure to enable default port 389 on your Firewall.
Select this option when GFI MailEssentials is installed in SMTP mode and/or when GFI MailEssentials does not have direct access to the full list of users.
4.
Specify the LDAP server name or IP address in the Server text box.
NOTE
In an Active Directory environment, the LDAP server is typically the Domain Controller or Global Catalog.
5.
Specify the port number, default 389, in the Port text box. If connection to the LDAP server is via SSL, select Use SSL and the default port changes to 636.
NOTE
Ensure that the port is enabled from the Firewall.
6.
Click Update DN list to populate the Base DN list and select the Base DN (that is, the top level in the Active Directory hierarchy).
7.
If your LDAP server requires authentication specify the User and Password . Alternatively, if no authentication is required, select Anonymous bind .
8.
Test your configuration settings by specifying a valid email address in the Email address box and click Test . If the email address is not found, review the configuration settings.
9.
To log Nonexistent Recipient activity to a log file, select Log occurrence to this file and specify path and file name
(including .txt extension) to a custom location on disk where to store the log file. Alternatively specify the file name only
(including .txt extension) and the log file will be stored in the following default location
<GFI MailEssentials installation path> \GFI\MailEssentials\\EmailSecurity\Logs\<filename>.txt
10.
Click Apply .
7.7 Quarantine Store Location and Public URL
Use the GFI MailEssentials Switchboard to configure the Quarantine Store location and the Quarantine Public URL.
The Quarantine Store location is the Quarantine Store location where quarantined emails are stored. By default, this is located in the GFI MailEssentials installation path. This might however need to be moved to an alternate location in cases where, for example, you might be running out of disk space.
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The Quarantine Public URL provides access to the Quarantine Page from an external location. By default, this is based on the GFI MailEssentials IIS Virtual directory settings you provided during installation. This however might need to be changed if you are sending quarantine digest emails or notifications that are accessed outside of the internal network.
When this is the case, the URL should be changed to be reached through Internet.
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard .
Screenshot 117: Quarantine Store location and Public URL
2. From Quarantine tab, click Browse to select an alternate location for the Quarantine Store.
IMPORTANT
Ensure that the disk partition where the Quarantine Store is saved has sufficient disk space. Spam emails will not be quarantined if the free disk space is less than 512 MB. On reaching 512 MB, email quarantine operation will stop and spam will be tagged and delivered to recipients‟mailboxes until free disk space increases to more than 512 MB
3. Provide an alternate URL as the URL to use to access the quarantine from an external location outside your organization,
4. Click OK to save setup.
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8 Email Management
GFI MailEssentials includes a number of tools that facilitate management of incoming and outgoing emails.
Topics in this chapter:
8.1 Disclaimers
Disclaimers are standard content added to the bottom or top of outbound email for legal and/or marketing reasons.
These assist companies in protecting themselves from potential legal threats resulting from the contents of an email and to add descriptions about the products/services offered.
Disabling and enabling disclaimers
Sorting disclaimers by priority
8.1.1 Configuring Disclaimers
To customize or create a new disclaimer:
1.
Go to Email Management > Disclaimers .
2.
Click a disclaimer to edit its settings or click Add Disclaimer to create a new disclaimer.
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Screenshot 118: Adding a new disclaimer
3.
In the General tab configure:
Option
Disclaimer
Name
Disclaimer
Type
Description
Key in a unique and friendly name for the disclaimer.
Disclaimer position
Choose to which user(s) to apply this disclaimer:
Domain disclaimer: All emails sent from a domain will have the disclaimer added. Select the domain from the
Domain drop-down list.
User/Group disclaimer: Click Search User/Group to select a user or a group of users, to whom the disclaimer is added for outbound emails. If GFI MailEssentials is in Active Directory mode, pick users or groups directly from
Active Directory; else specify the user's SMTP email address.
Select Top or Bottom option to configure if disclaimer should be located at the top or bottom of the email.
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Screenshot 119: HTML Disclaimer
4.
From the HTML tab, use the HTML editor to create a custom disclaimer in HTML format. To add email fields or Active
Directory fields (variables) in disclaimer, navigate to Insert > Variable… . Select the variable to add and click Add . The recipient display name and email address variables will only be included if the email is sent to a single recipient. If emails are sent to multiple recipients, the variables are replaced with 'recipients'.
NOTE
If you choose the Custom Attribute variable, you will need to specify a Microsoft Exchange custom attribute. For a full listing of attributes in your Active Directory configuration, install and use the ADSI Editor from Microsoft.
For more information, refer to: http://go.gfi.com/?pageid=ME_ADSI
5.
Select the encoding for the HTML disclaimer if the email body’s character set is not HTML:
Option
Convert to Unicode
Use HTML encoding
Use character set of email body
Description
Convert both email body and disclaimers to Unicode so that both are properly displayed. (Recom mended)
Use to define character sets for email body and disclaimer.
Disclaimer is converted to the email body character set.
NOTE: If selected, some disclaimer text might not display properly.
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6.
Select Plain Text tab and insert the text to include for use in plain text emails directly into the Text Disclaimer field.
Optionally add variables in disclaimer by clicking Variable….
The variables that can be added are email fields (sender name, recipient email address, etc…) or Active Directory fields (name, title, telephone numbers, etc..). Select the variable to add and click Add .
NOTE
The recipient display name and email address variables will only be included if the email is sent to a single recipient. If emails are sent to multiple recipients, the variables are replaced with 'recipients'.
7.
Specify the encoding to be used for the plain text disclaimer if the email body’s character set is not plain text:
Option
Convert to Unicode
Use character set of email body
Description
Converts both email body and disclaimers to Unicode so that both are properly displayed
Disclaimer is converted to the email body's character set
NOTE: If this option is selected, some of the disclaimer text might not be displayed properly.
8.
From the Exclusions tab, specify any senders or recipients for whom not to apply this disclaimer. Key in an email address or click Search to look-up email addresses from Active Directory. Click Add to add email address to the exclusion list.
NOTE
All recipients must be included in the exclusion list to not add a disclaimer in the email.
9.
Click Apply to save settings.
8.1.2 Disabling and enabling disclaimers
By default, disclaimers are automatically enabled. To disable or enable a disclaimer:
1.
Go to Email Management > Disclaimers .
2.
Select the disclaimers to disable/enable and click Disable selected or Enable selected to perform the desired action.
8.1.3 Sorting disclaimers by priority
The order in which disclaimers are applied to outbound messages can be customized. If multiple disclaimers are enabled and applied to the same user, the disclaimer with the higher is applied to that user.
To customize the priority of disclaimers:
1.
Go to Email Management > Disclaimers .
2.
Next to the disclaimer to change priority, click (up) button to assign a higher priority or click (down) button to assign a lower priority.
8.2 Auto-Replies
Auto-replies enable the sending of automated replies to specific inbound emails. A different auto- reply for each email address or subject can be specified. Variables can also be used in an auto-reply to personalize emails.
To enable auto-replies, go to Email Management > Auto-Replies and select Enable Auto-Replies .
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8.2.1 Configuring auto-replies
1.
Go to Email Management > Auto-Replies .
2.
Click Add Auto-Reply .
Screenshot 120: Auto-reply settings
3.
In Auto-Reply Settings configure the following options:
Option
When email is sent to: and subject contains:
Auto Reply from:
Auto Reply subject:
Description
Key in the email address that sends auto-replies when receiving emails.
Example - If ‘[email protected]’ is used, senders sending to this email address will receive an auto reply.
This option enables auto replies only for emails containing specific text in the subject field.
Specify an email address in case where an auto-reply is required from a different email address other than the email address to which the inbound email was addressed to.
Specify the subject of the auto reply email.
4.
In Auto Reply text , specify the text to display in the auto reply email.
NOTE
Import auto reply text from a text file via the Import button. Click Export to download auto-reply text to a text file.
Screenshot 121: Variables dialog
5.
Click Variable… to personalize auto-replies using variables. Select variable field to insert and click Add . Available vari ables are:
Option
Date Field
Description
Inserts the email sent date.
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Option
From Email Field
From Name Field
Subject Field
To Email Field
To Name Field
Tracking Number
6.
In Attachments area, select any attachments to send with the auto-reply email. Specify the location of the attach ment and click Add . Remove attachments using Remove .
7.
In Other Settings configure:
Option
Generate tracking number in sub ject
Include email sent
Description
Generates a unique tracking number in the auto reply.
By default, tracking numbers are generated using the following format: ME_YYMMDD_ nnnnnn
Where:
ME - GFI MailEssentials tag.
YYMMDD - Date in year, month and date format.
nnnnnn - automatically generated tracking number.
Select to quote the inbound email in auto reply.
8.
Click Apply .
Description
Insert sender email address.
Inserts the display name of the sender.
Inserts email subject.
Inserts the recipient’s email address.
Inserts the recipient’s display name.
Inserts tracking number (if generated).
8.3 List Server
List servers enable the creation of two types of distributions lists:
Newsletter - Used for creating subscription lists for company or product newsletters, to which users can either sub scribe or unsubscribe.
Discussion - Enables groups of people to hold discussions via email, with each member of the list receiving the email that a user sends to it.
8.3.1 Creating a newsletter or discussion list
To create a new newsletter or discussion list:
1.
Go to Email Management > List Server and click Add List .
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Screenshot 122: Creating a new list
2.
Configure the following options:
Option
Display Name
List type
List Name
Description
Key in a friendly name for the new list.
Select the type of discussion list to create:
Newsletter - Used for creating subscription lists for company or product news letters, to which users can either subscribe or unsubscribe.
Discussion - Enables groups of people to hold discussions via email, with each member of the list receiving the email that a user sends to it.
The list name is used in the list email address fields.
For example, if the list name is MyNewsletter, the list email address is
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Option
List domain
Automatically unsubscribe NDRs and move NDR to the following folder:
Description
The domain to use for the list. The list of domains is extracted from the
list.
The list server utilizes this domain for the list addresses displayed in the List email
addresses box.
When an NDR is received from a subscriber of the list, the subscriber is automatically unsubscribed and the NDR is moved to a custom folder.
3.
From the Database tab, select Microsoft Access or Microsoft SQL Server/MSDE as database. Configure the database type selected to store the newsletter/discussion subscribers list. The available options are:
Option
Microsoft
Access
Microsoft
SQL Server
Description
Specify a database name and location. GFI MailEssentials automatically creates a database.
Specify SQL server name, database and logon credentials used to store newsletter/discussion subscribers list. Click
Test to ensure that GFI MailEssentials can connect with the specified Microsoft SQL Server.
NOTE
You can use Microsoft Access for lists of up to a maximum of 5000 members.
4.
Customize your distribution list.
5.
Click Apply .
8.3.2 Using Newsletters/Discussions
After creating a newsletter/discussion list, users must subscribe to be part of the list.
Action
Subscribing to list
Completing sub scription process
Sending a news letter/discussion post
Unsubscribing from list
Description
Ask users to send an email to
<newslettername>[email protected]
On receiving the request, list server sends a confirmation email back. Users must confirm their subscription via a reply email to be added as a subscriber.
NOTE: The confirmation email is a requirement and cannot be turned off.
Members with permissions to send email to the list are required to send the email to the newsletter list mailing address:
<newslettername>@yourdomain.com
To unsubscribe from the list, users must send an email to:
<newslettername>[email protected]
NOTE
To enable users to easily subscribe to newsletters, add a web form asking for name and email address and automatically generate an email where the sender is the email address of the new user and the recipient is:
<newslettername>[email protected]
8.3.3 Configuring advanced newsletter/discussion list properties
After creating a new list, further options can be configured which enable the customization of elements and behavior of the list. These options include:
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Creating a custom footer for the list
Setting permissions to the list
Manually adding subscribers to the list
Importing subscribers to the list/database structure
Creating a custom footer for the list
1.
From the Footer tab configure a custom discussion list footer. A footer is added to each email sent to the list.
2.
Use the HTML editor to add an HTML version of the footer. To add variable fields in the list footer, navigate to Insert >
Variables . Select the variable to add and click Add .
3.
You can also enter a plain text footer for plain text lists. Click Variable...
to add variable fields.
4.
Click Apply .
Tip
You can use footers to show how users can subscribe/unsubscribe from list and/or to promote your social media channels.
Setting permissions to newsletters
Specify the users who can submit newsletters.
NOTE
Permissions are not configurable for discussion lists.
1.
Open an existing or create a new list and go to the Permissions tab.
2.
Key in an email address that can send newsletters and click Add . The email address is added to the list.
3.
A newsletter password secures access to newsletter in case someone else makes use of the email client or account details of a permitted user. Enable passwords by selecting the Password required: checkbox and providing a password.
NOTE
When sending emails to the newsletter, users must authenticate themselves by including the password in the email subject field. Password must be specified in the subject field as follows:
[PASSWORD: <password> ] <Subject of the email>
Example : [PASSWORD:letmepost]Special Offer.
If password is correct, the list server automatically removes the password details from subject and relays email to newsletter subscribers.
4.
Click Apply .
Manually adding subscribers to the list
Manually add users to newsletters/discussions without any action on their behalf.
NOTE
It is highly recommended that users subscribe themselves to the list by sending an email to the subscribe newsletter/discussion address. Ensure that you have users' authorization before manually adding them to the list.
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1.
Open an existing or create a new list and go to the Subscribers tab.
2.
Key in the subscriber details in Email Address (required), First name , Last name and Company fields and click Add .
The new subscriber email address is added to list.
3.
To remove users from the subscription list table when unsubscribing from the list (and not just flag them as unsub scribed) select Delete from database when user unsubscribes checkbox.
4.
Click Apply .
Importing subscribers to the list / database structure
When a new newsletter or discussion list is created, a table called 'listname_subscribers' with the following fields is created in the database.
To import data into the list, populate the database with data in the following fields.
Default Value Flags
PK
Field Name
Ls_id
Ls_first
Ls_last
Ls_email
Ls_unsubscribed
Ls_company
Type
Varchar(100)
Varchar(250)
Varchar(250)
Varchar(250)
Int
Varchar(250)
0 NOT NULL
Description
Subscriber ID
First name
Last name
Unsubscribe flag
Company name
8.4 Mail Monitoring
Mail monitoring enables copying emails sent to or from a particular local email address to another email address. This enables the creation of central store of email communications for particular persons or departments.
8.4.1 Adding new Mail Monitoring rules
1.
Go to Email management > Mail Monitoring .
2.
Click Add Rule...
.
3.
From the General tab configure the following options:
Option
Mail Monitor Name
Inbound or Outbound
Copy monitored email to user or email address
If sender is and recipient is
Description
Key in a friendly mail monitoring rule name.
Select whether to apply rule to inbound or outbound emails.
The destination email address or mailbox where to copy the emails to. Select Email Address to manually key in an email address or select User to look-up
Specify the email address of the sender to monitor. Click All Domains to monitor emails sent by all users.
Specify the email address of the recipient to monitor. Click All Domains to monitor emails received by all users.
4.
Click Add to add the configured rule.
5.
Repeat the above steps to specify multiple filters.
GFI MailEssentials 8 Email Management | 205
6.
From the Exceptions tab specify users and email addresses for whom the rule shall not apply. The available options are:
Option
Except if sender is
Except if recip ient is
Description
Excludes the specified senders from mail monitoring.
For inbound monitoring rules, key in non-local email addresses.
For outbound monitoring rules, all addresses in this list are local. Click Search User to find local email addresses and click Add.
Excludes the specified recipients from the list.
For inbound monitoring rules, all addresses in this list are local. Click Search User to find local email addresses and click Add.
For outbound monitoring rules, key in non-local email addresses.
7.
Click Apply .
8.4.2 How to use Mail Monitoring
Refer to the below table for information on how to configure mail monitoring for different requirements and scenarios:
What to monitor
All email sent by a par ticular user
All email sent to a par ticular user
Mail sent by a particular user to an external recip ient
Mail sent to a particular user by an external sender
Mail sent by a particular user to a company or domain
Mail sent to a particular user by a company or domain
Description
Create an outbound rule and specify sender email or select user (if using AD) in the sender field. Click
All Domains in the recipient’s field.
Create an inbound rule and specify the recipient's email address or select user (if using AD) in the recipient field. Click All Domains in the sender’s field.
Create an outbound rule, specify sender or select user (if using AD) in the sender field. Key in external recipient email in the recipient field.
Create an inbound rule and specify external sender email address in the sender field. Key in email address or select user (if using AD) in the recipient field.
Create an outbound rule and specify sender or select user (if using AD) in the sender field. Specify the domain of the company in the recipient field.
Create an inbound rule and specify domain of the company in the sender field. Select domain when clicking on the sender button and enter username or user email address in the recipient field.
8.4.3 Enabling/Disabling email monitoring rules
1.
Go to Email management > Mail Monitoring .
2.
Select the rule to enable/disable.
3.
Click Enable Selected or Disable Selected to enable or disable the selected rule respectively.
4.
Click OK to save changes.
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9 General Settings
Topics in this chapter:
9.1 Administrator email address
9.2 Enabling/Disabling scanning modules
9.6 Remote Active Directory mode
9.8 SMTP Virtual Server bindings
9.0.1 Perimeter SMTP Server Settings
SMTP servers that relay emails to the GFI MailEssentials server must be specified.
1.
From the GFI MailEssentials Configuration, go to General Settings > Perimeter SMTP Servers .
GFI MailEssentials 9 General Settings | 207
Screenshot 123: Perimeter SMTP Server settings
2.
Configure the following options:
Option
This is the only SMTP server which receives emails from the Internet
The following SMTP servers receive emails directly from the Internet and for ward them to this server
Description
Select this option when GFI MailEssentials is installed on the only SMTP server that receives external emails directly from the Internet.
Emails are relayed to the GFI MailEssentials server from other SMTP servers. Add these
SMTP Servers in the SMTP Server list:
Automatic detection: To automatically detect SMTP servers by retrieving MX records of inbound domains, click Detect.
Manual addition: To manually add the IP addresses of SMTP servers that relay emails to the GFI MailEssentials server, key in the IP address or a range of IP addresses (using
CIDR notation) and click Add SMTP Server
3.
Click Apply .
9.1 Administrator email address
GFI MailEssentials sends important notifications to the administrator via email. To set up the administrator’s email address:
1. From the GFI MailEssentials Configuration navigate to General Settings > Settings and select the General tab.
GFI MailEssentials 9 General Settings | 208
Screenshot 124: Specifying the administrator’s email address
2. Key in the administrator’s email address in the Administrator email area.
3. Click Apply .
9.2 Enabling/Disabling scanning modules
From GFI MailEssentials you can enable or disable particular email scanning modules. This allows switching on and off scanning engines or filters in batch.
NOTE
This feature enables or disables particular scanning engines only. Disabled engines do not process inbound, outbound and/or internal emails. All other features of GFI MailEssentials, such as the quarantine store, is still functional.
1. From the GFI MailEssentials Configuration, navigate to General Settings > Settings and select the General tab.
Screenshot 125: Scanning Manager
2. Enable or disable scanning modules:
Option
Enable Email Security
Description
Enables/Disables the following scanning engines:
Virus Scanning Engines
Information Store Protection
Trojan & Executable Scanner
Email Exploit Engine
HTML Sanitizer
GFI MailEssentials 9 General Settings | 209
Option
Enable Anti-Spam
Enable Content Filtering
Description
Enables/Disables the following anti-spam filters:
SpamRazer
Anti-Phishing
Directory Harvesting
Email Blocklist
IP Blocklist
IP DNS Blocklist
URI DNS Blocklist
Sender Policy Framework
Anti-Spoofing
Greylist
Language Detection
Header Checking
Spam Keyword Checking
Bayesian Analysis
Whitelist
New Senders
Enables/Disables the following content filtering engines:
Keyword Filtering
Attachment Filtering
Decompression Engine
Advanced Content Filtering
3. Click Apply .
9.3 Proxy settings
GFI MailEssentials automatically checks for and downloads updates (for example, virus definitions updates and
SpamRazer definitions) from the Internet. If the server on which GFI MailEssentials is installed, connects to the Internet through a proxy server, configure the proxy server settings as follows:
1. From GFI MailEssentials Configuration go to General Settings > Settings and select Updates tab.
GFI MailEssentials 9 General Settings | 210
Screenshot 126: Updates server proxy settings
2. Select the Enable proxy server checkbox.
3. In the Proxy server field key in the name or IP address of the proxy server.
4. In the Port field, key in the port to connect on (default value is 8080).
5. If the proxy server requires authentication, select Enable proxy authentication and key in the Username and
Password .
6. Click Apply .
GFI MailEssentials 9 General Settings | 211
9.4 Local domains
Screenshot 127: Local Domains list
GFI MailEssentials requires the list of local domains to enable it to distinguish between inbound, outbound or internal emails. During installation or post install wizard, GFI MailEssentials automatically imports local domains from the IIS SMTP service or Microsoft
®
Exchange Server. In some cases, however, local domains may have to be added manually.
IMPORTANT
GFI MailEssentials only filters emails destined to local domains for spam. Some filters are also based on the direction.
This is determined by the local domains
To add or remove local domains after installation, follow these steps:
1. Go to General Settings > Settings and select Local Domains tab.
2. Key in the name and description of the domain to add in the Domain and Description text boxes.
3. Click Add to include the stated domain in Local Domains List .
NOTE
To remove a listed domain, select it from the list and click Remove .
4. Click Apply .
GFI MailEssentials 9 General Settings | 212
9.5 Managing local users
GFI MailEssentials uses 4 ways to retrieve users depending on the installation environment. Choose the type of user mode during installation. The number of users retrieved is also used for licensing purposes.
9.5.1 GFI MailEssentials installed in Active Directory mode
When GFI MailEssentials is not installed on the same machine as your mail server and Active Directory is present, then GFI
MailEssentials retrieves mail-enabled users from the Active Directory domain of which the GFI MailEssentials machine forms part.
9.5.2 GFI MailEssentials installed in Remote Active Directory mode
When GFI MailEssentials is installed on a machine that is not joined to a domain, it can be configured to retrieve mailenabled users from a remote Active Directory domain using LDAP.
This mode can be used for example, when installing GFI MailEssentials in a DMZ, before the firewall that separates your internal and external networks. In this example, the GFI MailEssentials is typically not joined to the internal domain. In this mode, all other features of GFI MailEssentials function similarly to when GFI MailEssentials is joined to a domain.
Configure the Remote Active Directory server from the Switchboard.
For more information, refer to Remote Active
9.5.3 GFI MailEssentials installed on the Microsoft
®
Exchange machine
When GFI MailEssentials is installed on the same machine as Microsoft
®
Directory users that have a mailbox on the same Microsoft ®
Exchange, GFI MailEssentials retrieves the Active
Exchange Server.
9.5.4 GFI MailEssentials installed in SMTP mode
When you choose to install GFI MailEssentials in SMTP mode, the list of local users is stored in a database managed by GFI
MailEssentials.
To populate and manage the user list when GFI MailEssentials is installed in SMTP mode, go to General > Settings and select the User Manager tab.
The User Manager tab displays the list of local users and allows you to add or remove local users. The list of local users is used when configuring user-based rules, such as Attachment Filtering rules and Content Filtering rules.
NOTE
GFI MailEssentials automatically populates the list of local users using the sender’s email address in outbound emails.
To add a new local user:
1. Enter the email address in the Email address box.
2. Click Add .
3. Repeat to add more local users and click Apply .
To remove a local user:
1. Select the local user you want to remove from the Local Users list and click Remove .
2. Repeat to remove more local users and click Apply .
GFI MailEssentials 9 General Settings | 213
9.6 Remote Active Directory mode
When GFI MailEssentials is installed in Remote Active Directory mode, configure the Remote Active Directory in use and connection settings from the Switchboard.
IMPORTANT
Use caution when changing Remote Active Directory settings. The newly retrieved user list may be different from existing user list (for example, when connecting to a different domain). In this case existing configurations may fail due to missing users.
To configure the Remote Active Directory connection:
1.
Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard .
Screenshot 128: GFI MailEssentials Switchboard - Remote Active Directory settings
2.
Go to the Remote Directory tab and configure:
Option
Host
Description
Specify the host name of the remote Active Directory server.
GFI MailEssentials 9 General Settings | 214
Option
Port
Domain\User
& Password
Description
Key in the LDAP port to use to retrieve the list of users from Active Directory. By default LDAP uses port 389.
To connect using a secure connection, select Use SSL, which by default uses port 636. An SSL certificate is required to use this setting.
If there is a firewall between GFI MailEssentials and Active Directory, open the LDAP port to allow communication.
Key in the credentials of a domain user which are used to connect to the directory service. Ensure that the password is not set to expire and does not change. If the password changes, this setting needs to be revised accordingly and you may experience some incorrect behavior by GFI MailEssentials since it will not be able to retrieve the list of users.
3.
Click Test to ensure connection and retrieval of users from Active Directory.
4.
Click OK .
9.7 Licensing
Purchase a license that is equivalent to the number of mailboxes or users protected by GFI MailEssentials.
Key in the purchased license key during installation or from the GFI MailEssentials Configuration. Go to General Settings
> Licensing and key in your license in the License key box. Click Apply .
9.7.1 License key information
To review your license information, including the subscription expiry date, go to General Settings > Licensing and review the details in the License key information .
Label
Product Edition
Anti-spam
EmailSecurity
Subscription status
Number of licensed users
Current number of users
Description
The edition of GFI MailEssentials depending on the type of subscription purchased:
Anti-spam - Enables the anti-spam filtering functionality. Security and anti-malware scanning engines are disabled.
EmailSecurity - Enables the security and anti-malware scanning engines. Anti-spam filters are disabled.
UnifiedProtection - Includes both the anti-spam and email security functionality.
Shows if anti-spam functionality is licensed.
Indicates whether the security and anti-malware functionality is licensed.
The date when the subscription expires.
When the license expires, your email server will no longer be protected. GFI MailEssentials stops scanning emails and stops downloading updates.
The maximum number of users allowed by the purchased license.
The number of users that are being protected by GFI MailEssentials.
9.7.2 How to determine license requirements
GFI MailEssentials counts the total mailboxes/email addresses depending on the environment. To determine the number of users in your environment, go to http://go.gfi.com/?pageid=ME_RetrieveAndCountUsers .
9.8 SMTP Virtual Server bindings
GFI MailEssentials always binds to the first SMTP virtual server configured in IIS. In case of multiple SMTP virtual servers,
GFI MailEssentials may be required to be bound to a new or a different SMTP Virtual Server.
GFI MailEssentials 9 General Settings | 215
NOTE
The SMTP Virtual Server Bindings tab is not displayed if you installed GFI MailEssentials on a Microsoft
®
Server 2007 or later machine.
Exchange
9.8.1 Binding GFI MailEssentials to another other SMTP Virtual Server.
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
1. Go to General Settings > Settings and click Bindings tab.
2. Select the SMTP Virtual Server to bind GFI MailEssentials to.
3. Click Apply .
4. GFI MailEssentials will ask to restart services for the new settings to take effect.
9.9 Product Updates
The Product Updates feature verifies if there are any software patches available for your version of GFI MailEssentials by directly connecting to the GFI Update Servers.
By default, GFI MailEssentials downloads updates automatically on a preset schedule.
NOTE
It is highly recommended to check have this feature to download updates automatically to keep GFI MailEssentials updated.
9.9.1 Viewing and installing downloaded updates
To view or install downloaded updates:
1. Navigate to General Settings > Product Updates and select Updates tab.
GFI MailEssentials 9 General Settings | 216
Screenshot 129: View and install product updates
2. Expand any updates to see details about the downloaded updates. Click Install to install update.
9.9.2 Disabling or modifying schedules
To disable or modify this schedule:
1. Navigate to General Settings > Product Updates and select Settings tab.
GFI MailEssentials 9 General Settings | 217
Screenshot 130: Disable or modify product update schedule
2. Edit the following options:
Option
Manual
Automatic
Description
Disables the schedule. Check for updates will only be triggered manually.
Enables the schedule. Also configure the schedule that the update will follow:
Daily - Checks for updates daily at the set time.
Weekly - Checks for updates weekly at the set date and time.
First - Checks for updates on the first day of the month that is chosen and at the specified time.
Last - Checks for updates on the last day of the month that is chosen and at the specified time.
3. Click Apply .
9.10 Access Control
Allow or block access to various features of GFI MailEssentials for particular domain users or groups. Users can access the
Web UI of GFI MailEssentials using their domain credentials. The features shown to logged in users depends on the
Access Control configuration.
NOTE
Configuring access control from the web UI is only possible when GFI MailEssentials is running in IIS mode and can be accessed over the network. Access Control is configurable from the Switchboard when GFI MailEssentials is running in Local mode.
For more information, refer to Access Control List (page 223).
GFI MailEssentials 9 General Settings | 218
The Domain Admins group (in an Active Directory environment only) and the server administrator account/group are automatically given full access privileges to all features of GFI MailEssentials.
Other users or groups can be given full or partial access to certain GFI MailEssentials features. To add users to the Access
Control list:
1. From GFI MailEssentials Configuration, go to select the product features to allow access to.
General Settings > Access Control . Add domain users or groups and
Screenshot 131: Access control settings
2. Click Add User/Group .
3. In the User Lookups dialog, enter the name of the user or group to add and click Check Names .
4. GFI MailEssentials displays the list of users/groups found. Select the users/groups to add and click Submit .
5. For the newly added users/groups, select the features to allow access to.
Permission
Full Access
Quarantine
Reporting
RSS
Description
User can access and configure all features of the product.
Allows access to
and
Enables users to
.
Allows users to subscribe to the
6. Click Apply .
GFI MailEssentials 9 General Settings | 219
10 Miscellaneous topics
Topics in this chapter:
10.6 POP2Exchange - Download emails from POP3 server
10.7 Moving spam to user’s mailbox folders
10.8 Set a Microsoft® Exchange account
10.9 Exporting and importing settings manually
10.10 Disabling email processing
10.11 Email backup before and after processing
10.13 Monitoring Virus Scanning API
10.1 Installation information
Screenshot 132: Version Information page
GFI MailEssentials 10 Miscellaneous topics | 220
To view the GFI MailEssentials version information, navigate to About node. The Version Information tab displays the
GFI MailEssentials installation version and build number.
To check whether you have the latest build of GFI MailEssentials installed on your machine, click Check if newer build exists .
NOTE
Always quote your GFI version and build information when contacting GFI support.
The 3rd Party Licenses tab lists third party components in use by GFI MailEssentials.
10.2 Virtual directory names
The default virtual directory names of GFI MailEssentials and Quarantine RSS are MailEssentials and MailEssentialsRSS respectively. Virtual directory names are customizable; however it is recommended that these are not changed.
NOTE
If GFI MailEssentials is configured to be accessed only from the local machine, the GFI MailEssentials Configuration virtual directory is not configurable.
1. Launch GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard .
2. From IIS user interface mode options area, specify custom virtual directory names for:
GFI MailEssentials Configuration - key in a custom name in the Virtual directory field.
Quarantine RSS virtual directory - key in a custom name in the RSS Virtual directory field.
3. Click Apply .
4. Click OK and wait while applying the new settings.
5. When the process completes, click OK .
10.3 User interface mode
The GFI MailEssentials user interface can be loaded on the installation machine only (local mode) or accessible via http over the network (IIS mode).
To select the mode:
1.
Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard .
GFI MailEssentials 10 Miscellaneous topics | 221
Screenshot 133: GFI MailEssentials Switchboard - UI Mode
2.
From the UI mode area, select:
Option
Local mode
Description
GFI MailEssentials loads in an html viewer application, accessible from the machine where GFI MailEssentials is installed only.
NOTE
If using Local mode:
Spam digest links will not work
User portal will not be available - users will not be able to manage personal whitelists and blocklists and
their personal quarantine. For more information, refer to End User Actions (page 12).
IIS mode
(recommended)
GFI MailEssentials loads in your default web browser using the IIS setup settings configured during installation.
User interface is also accessible over the network via http.
NOTE
IIS setup settings can be altered using the Website name, Virtual directory and RSS virtual Directory fields.
The Security options enable the configuration of an Access Control List and the IIS Authentication.
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
GFI MailEssentials 10 Miscellaneous topics | 222
3.
Click Yes to restart the displayed services.
4.
Click OK .
10.3.1 IIS Security Settings
The Security button within the UI mode tab enables you to configure an Access Control List and Authentication method.
Access Control List
The Access control list specifies who can access GFI MailEssentials and what features are available for which users or groups. By default, Administrators are granted full access to GFI MailEssentials; you can however specify specific users or groups with different access types.
To add a user:
1.
Load the Switchboard by navigating to Start > Programs > GFI MailEssentials > Switchboard .
2.
Select UI Mode tab. Click IIS Mode and select Security .
Screenshot 134: IIS Security - ACL tab
3.
Click Add...
and provide the name of the user or group to add to the list.
4.
Select the type of access to grant. Available options are:
Permission
Full Access
Quarantine
Description
User can access and configure all features of the product.
Allows access to
and
GFI MailEssentials 10 Miscellaneous topics | 223
Permission
Reporting
RSS
Description
Enables users to
.
Allows users to subscribe to the
5.
Click OK to finalize setup.
To remove access to a user or group, select the item to remove and click Remove .
IIS Authentication Mode
The IIS Authentication Mode enables you to choose the authentication method to use when accessing GFI
MailEssentials.
1.
Load the Switchboard by navigating to Start > Programs > GFI MailEssentials > Switchboard .
2.
Select UI Mode tab. Click IIS Mode and select Security .
3.
Select Authentication tab.
Screenshot 135: IIS Security - Authentication tab
4.
Select one of the available options:
Option
Windows
Mode
Forms
Mode
Description
Windows authentication enables GFI MailEssentials to make use of the credentials of the currently logged on user and does not provide log-off and automatic timeout of the user interface session.
(Default) Forms authentication provides the ability for users to log off. It also enables you to configure an automatic timeout from the user interface session. This is recommended if end users are accessing their GFI MailEssentials user console, especially if used from public computers.
5.
Click OK to save settings.
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10.4 Failed emails
There may be instances where the GFI MailEssentials email security or content filters cannot scan an email, for example, emails containing corrupted header information. In this case, GFI MailEssentials blocks the email since it may contain malicious content, and moves it to the following folder:
<GFI MailEssentials installation path> \EmailSecurity\failedmails
10.4.1 Reprocessing legitimate emails that fail
It is recommended to contact GFI Support when a number of emails are being moved to the failedmails folder. When the issue is resolved, emails can be re-scanned by GFI MailEssentials to determine if they are safe to be delivered.
NOTE
Files with extension .PROP in the failedmails folder are used for troubleshooting purposes. When reprocessing failed emails, these files can be deleted.
GFI MailEssentials installed on Microsoft
®
Exchange Server 2007/2010/2013/2016
1. In the failedmails folder, change the extension of .TXT files to .EML.
NOTE
To automatically change the extension of all .TXT files in the failedmails folder to .EML files, from command prompt change the directory to the failedmails folder and run the following command: ren *.txt *.eml
2. Move renamed files to the following folder:
<Microsoft Exchange installation path> \TransportRoles\Replay
GFI MailEssentials installed on Microsoft
®
Exchange Server 2003
Move emails (in .txt format) from the failedmails folder to the following folder:
<Microsoft Exchange installation path> \Exchsrvr\Mailroot\vsi 1\PickUp
GFI MailEssentials installed on Gateway server
Move emails (in .txt format) from the failedmails folder to the following folder:
<drive>\Inetpub\mailroot\Pickup
10.4.2 Failed emails notifications
GFI MailEssentials can be configured to notify the administrator when an email fails processing.
The administrator’s email address can be configured from GFI MailEssentials General Settings node.
For more information, refer to Administrator email address (page 208).
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Other tab.
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Screenshot 136: Enabling Failed emails notification
2. Select Send Notifications on Failed Mail .
3. Click Apply .
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
4. Click Yes to restart the displayed services.
5. Click OK .
10.5 Tracing
GFI MailEssentials provides the facility of creating log files for debugging purposes. Use tracing for troubleshooting purposes or when contacting GFI Support. Disable tracing if there are performance issues with the GFI MailEssentials machine.
When enabled, GFI MailEssentials stores a number of log files in the following folders:
<GFI MailEssentials installation path>\GFI\MailEssentials\ DebugLogs\
<GFI MailEssentials installation path>\GFI\MailEssentials\ Antispam\DebugLogs\
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<GFI MailEssentials installation path>\GFI\MailEssentials\ EmailSecurity\DebugLogs\
<GFI MailEssentials installation path>\GFI\MailEssentials\ WwwConf\DebugLogs\
<GFI MailEssentials installation path>\GFI\MailEssentials\ ActionServices\DebugLogs\
<GFI MailEssentials installation path>\GFI\MailEssentials\ Attendant\DebugLogs\
<GFI MailEssentials installation path>\GFI\MailEssentials\ Backend\DebugLogs\
To enable or disable Tracing:
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Tracing tab.
Screenshot 137: Configuring Tracing options
2. Select or unselect Tracing enabled to enable or disable logging respectively.
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
3. Click Yes to restart the displayed services.
4. Click OK .
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Clear Tracing Logs
To delete all Tracing logs:
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Tracing tab.
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
2. Click Clear Tracing Logs and click Yes to restart the displayed services.
3. Click OK when completed.
10.6 POP2Exchange - Download emails from POP3 server
POP2Exchange downloads emails from a POP3 server, processes them and sends them to the local mail server. The recommendation for GFI MailEssentials is to, if possible, avoid using POP3 and to use SMTP since POP3 is designed for email clients and not for mail servers. Notwithstanding this fact, and to cater for situations where a static IP address required by SMTP is not available, GFI MailEssentials can use POP3 to retrieve email.
10.6.1 Configuring POP3 downloader
1.
Go to POP2Exchange node.
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Screenshot 138: The GFI MailEssentials POP3 downloader
2.
In the POP3 tab, select Enable POP2Exchange from POP3 server to enable POP3 downloader.
3.
In the POP3 Mailboxes box, specify the details of the POP3 servers to download emails from:
Option
POP3
Server
Port
Use SSL
Accept
Invalid Cer tificate
Login
& Password
Description
Key in the IP address of the POP3 server to download emails from.
Key in the POP3 port. By default POP3 uses port 110, or port 995 when using a secure connection.
Select if the POP3 server requires a secure connection.
Select this option if you want to ignore unverified certificates from the POP3 server. It is recommended to unselect this option and ensure that all certificates are validated.
Specify the credentials to login to the POP3 mailbox.
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Option
Alternate address
Send mail to:
Description
If the emails in the mailbox are addressed to a recipient that is not on one of the GFI MailEssentials local domains, emails will be routed to this address. Ensure that this is a local address, configured on the mail server and protected by GFI MailEssentials.
Choose:
Address stored in 'To' field: GFI MailEssentials analyzes the email header and routes the email accordingly. If email analyzing fails, email is sent to the email address specified in the Alternate address field.
Alternate address: GFI MailEssentials does not analyze the email headers and all emails from this mailbox are for warded to email address configured in Alternate address.
4.
Click Add to add the POP3 server details. Select an added POP3 Server and click Update to replace it with the newly entered settings.
5.
Repeat the steps above to add multiple POP3 servers.
6.
In POP3 Options configure:
Option
Check every (minutes)
Do not deliver mails larger than
If mail is larger, then:
Description
Specify the download interval in minutes.
Specify a maximum download size in KBytes. If email exceeds this size, it will not be downloaded.
Choose to delete email larger than the maximum allowed size, or send a message to the postmaster.
8. Click Apply .
10.6.2 Configure dial up connection options
1.
Go to POP2Exchange node and select the Dialup tab.
2.
Select Receive mails by Dial-Up or Dial on Demand .
GFI MailEssentials 10 Miscellaneous topics | 230
Screenshot 139: Dialup options
3.
Select a dial-up networking profile and configure a login name and password. The following options are available:
Option
Dial-Up Net working profile
If not connected, dial
Process only when already connected
Dial on demand router:
Description
Choose the Dial-up Networking profile to use.
GFI MailEssentials will only dial-up if there is no connection.
GFI MailEssentials will only process email if a connection already exists.
In case of an Internet connection that is automatically established (such as a dial on demand router) select this option. GFI MailEssentials will pick up email at the specified interval without triggering a dial-up connection.
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Option
Username & Pass word
Process every
(minutes)
Description
Enter credentials used to logon to your ISP.
Enter the interval in minutes.
4.
In the Schedule area, specify the hours when GFI MailEssentials should dial-up to pick up email.
5.
Click Apply .
10.7 Moving spam to user’s mailbox folders
When GFI MailEssentials is installed on the Microsoft
®
Exchange Server, spam emails can be saved in a user’s mailbox folder.
For more information, refer to Spam Actions - What to do with spam emails (page 128).
If GFI MailEssentials is NOT installed on the Microsoft
®
Exchange Server, spam emails cannot be routed to a specific user’s mailbox folder through the Spam Actions. Emails can still however be routed to the user’s mailbox as described below. In the spam filter actions screen, use the Tag the email with specific text to add a tag to the email subject. This tag is then used to configure mail routing.
In Microsoft Exchange 2007 onwards, create a transport rule that forwards tagged emails to the user’s Junk E-mail mailbox folder. In Microsoft Exchange 2003 use the GFI MailEssentials Rules Manager to move tagged emails to users’ mailbox folder.
10.7.1 Microsoft
®
Exchange 2013/2016
Create a Microsoft
® folder.
Exchange 2013/2016 Transport Rule that forwards tagged emails to the user’s Junk E-mail mailbox
IMPORTANT
In GFI MailEssentials Spam Actions select the Tag the email with specific text option only. If you select any other action, emails detected as spam will not reach the mailbox of the user, and therefore the configured transport rules will not be applicable.
To create a Transport Rule in Exchange 2013/2016:
1.
Launch the Microsoft
®
Exchange Administrative Center.
2.
Go to Mail flow > Rules .
3.
Click Add + and select Create a new rule .
4.
Type a name for the new rule, for example, GFI MailEssentials SPAM .
5.
Click More options...
.
6.
In Apply this rule if...
select The subject or body...
and choose subject includes any of these words .
7.
In Specify words or phrases key in the tag specified in the spam actions of each spam filter (example, [SPAM] ) and click Add + . If using different tags for different spam filters, repeat until all tags are keyed in. Click OK on completion.
8.
In Do the following...
select Modify the message properties and choose set the spam confidence level (SCL) .
9.
In Specify SCL choose 9 and click OK .
10.
Specify additional properties for this rule. On completion click Save .
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NOTE
Ensure that the Junk E-Mail folder is enabled for the users’ mailboxes.
The transport rule created will now forward all emails which contain the GFI MailEssentials tag to the users’ Junk E-mail folder.
10.7.2 Microsoft
®
Exchange 2007/2010
To configure Microsoft
®
Exchange 2007/2010 to forward tagged emails to the user’s Junk E-mail mailbox folder, a
Transport Rule needs to be created.
IMPORTANT
In GFI MailEssentials Spam Actions select the Tag the email with specific text option only. If you select any other action, emails detected as spam will not reach the mailbox of the user, and therefore the configured transport rules will not be applicable.
To create a Transport Rule in Exchange 2007/2010:
1. Launch the Microsoft
®
Exchange Management Console.
2. Navigate to Microsoft Exchange > Organization Configuration > Hub Transport and select the Transport Rules node.
3. Click New Transport Rule .
4. Type a name for the new rule (example, GFI MailEssentials SPAM ) and click Next .
5. In the Conditions area, select When the Subject field contains specific words .
6. In the Edit rule area, click Specific Words to enter the words used for tagging. Type the tag specified in the spam actions of each spam filter (example, [SPAM] ) and click Add . Click OK when all words are added and click Next .
7. In the Actions area, select Set the spam confidence level to value .
8. In the Edit rule area, click 0 and set the confidence level to 9 . Click OK and click Next .
9. (Optional) Set any exceptions to this transport rule and click Next .
10. Click New to create the new Transport Rule.
NOTE
Ensure that the Junk E-Mail folder is enabled for the users’ mailboxes.
The transport rule created will now forward all emails which contain the GFI MailEssentials tag to the users’ Junk E-mail folder.
10.7.3 Microsoft
®
Exchange Server 2003
GFI MailEssentials includes a Rules Manager utility that automatically moves emails tagged as spam to the users’ mailbox.
IMPORTANT
To use Rules Manager, in Spam Actions select the Tag the email with specific text option and specify a tag.
Install Rules Manager on the Microsoft
®
Exchange Server
1. From the GFI MailEssentials machine, go to:
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<GFI MailEssentials installation path> \GFI\MailEssentials\Antispam\
2. Copy the following files to a folder on the Microsoft
®
Exchange Server: rulemgmtres.dll
rulemgmt.exe
rule.dll
gfi_log.dll
3. From the Microsoft ® Exchange Server, open command prompt and change the directory to the location where the
Rules Manager files were copied.
4. In command prompt type: regsvr32 rule.dll
5. On confirmation, click OK .
Launch Rules Manager
1. From the Microsoft
® rulemgmt.exe
.
Exchange Server, navigate to the location where Rules Manager files were copied and open
2. Select a Microsoft ® first time only).
Outlook profile (MAPI profile) or create a new profile to login (when using the Rules Manager the
3. Click OK to launch the Rules Manager.
4. The main window of the rules manager displays all the mailboxes enabled on the Microsoft
® color of the mailboxes indicates the status of that mailbox:
Exchange Server. The
Blue - mailbox has rules configured
Black - mailbox has no rules configured.
Setting new rules
1. Check the mailboxes to set a rule on and click Configure… .
NOTES
1. New rules can be added to mailboxes which already contain rules.
2. Select multiple mailboxes to configure the same rule applicable to all mailboxes.
2. In the Rule Condition text box, type the tag given to the spam email in the GFI MailEssentials spam actions.
3. Specify the Rule action :
Select Delete to delete an email which has a subject that contains the rule condition
Select Move to: to move spam email to a folder in the mailbox. Key in the folder path where to save the spam email.
If you specify Inbox\Spam, then a spam folder will be created in the Inbox folder. If you specify just Spam, then the folder will be created at the top level (same level as Inbox).
4. Click Apply to save the set rules.
Managing multiple rules
More than one rule can be set on the same mailbox.
Example: Delete emails tagged with [Phishing] and move emails tagged with [SPAM] to Inbox\Spam folder.
1. Double click on a mailbox to launch the Rules dialog.
2. A list of rules applicable to the selected mailbox is displayed.
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Click Add rule to add a new rule
Select a rule and click Edit rule to change settings of the selected rule
Select a rule and click Delete rule to delete the selected rule.
3. Click Apply to save settings.
10.8 Set a Microsoft
®
Exchange account
When GFI MailEssentials is installed on Microsoft
® features:
Exchange, a dedicated user must be created to use any one of these
Deliver spam email to an Exchange mailbox sub-folder (required when installing on Exchange 2010 or newer ver sions only)
Information Store Protection using EWS (not required when using VSAPI)
GFI MailEssentials can create this user and configure its permissions automatically or else create the user manually. For more information refer to http://go.gfi.com/?pageid=ME_SpamExch2010
This account's details (such as username and password) must not be changed from Microsoft
®
Directory, else these features will not work.
Exchange or Active
Configure the dedicated user from the GFI MailEssentials Switchboard. To configure a dedicated user:
1.
Launch GFI MailEssentialsSwitchboard from Start > Programs > GFI MailEssentials > Switchboard .
2.
Select the Exchange account tab.
3.
Click Change...
.
4.
Select one of the following options:
Option
Create a new account
Use the fol lowing account
Description
Let GFI MailEssentials automatically create a user with all the required rights.
Use a manually created user. Specify the credentials (Domain\username and Password) of a dedicated user and click Set access rights to assign the required rights to the specified user.
5.
Click Finish to apply settings.
6.
Click OK .
10.9 Exporting and importing settings manually
GFI MailEssentials includes a Configuration Export/Import tool to export settings from one installation and import them in another.
NOTE
Settings can also be imported and/or exported from command line.
For more information, refer to Export/Import settings via command line (page 238).
Step 1: Export existing settings
1. Go to <GFI MailEssentials installation path>\GFI\MailEssentials\ and launch meconfigmgr.exe
.
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Screenshot 140: Configuration Export/Import Tool
NOTE
Duration of the export process depends on the databases’ sizes.
4. Click Export .
5. From Browse for Folder dialog, choose folder where to export configuration settings and click OK .
6. On completion, click Exit .
Step 2: Copy the exported settings
1. Manually copy the folder where the configuration settings were exported.
2. Paste the folder to the machines where to import the settings.
Step 3: Import settings to new installation
IMPORTANT
When importing settings, the imported files overwrite existing settings (for example, Source DNS settings) and may require reconfiguration of particular network settings and spam actions.
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
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1. Stop the following services:
GFI List Server
GFI MailEssentials AS Scan Engine
GFI MailEssentials Attendant
GFI MailEssentials Autoupdater
GFI MailEssentials AV Scan Engine
GFI MailEssentials Backend
GFI MailEssentials Enterprise Transfer
GFI MailEssentials Legacy Attendant
GFI MailEssentials Quarantine Action Services
GFI POP2Exchange
IIS Admin service
2. Go to <GFI MailEssentials installation path>\GFI\MailEssentials\ and launch meconfigmgr.exe
.
NOTE
Duration of the import process depends on size of the databases to be imported.
4. Click Import , choose folder containing import data and click OK .
WARNING
The import process replaces the configuration files with the files found in this folder.
NOTE
Some imported settings may not be appropriate for the installation of GFI MailEssentials may need to be reconfigured. This is possible for example, DNS settings, domains list and perimeter servers are different from the server from which settings were exported. Click Yes to launch the GFI MailEssentials Post-Installation wizard to reconfigure important settings.
For more information, refer to Post-Installation Wizard (page 33).
It is also recommended to verify the following settings that are not configured during the Post-Installation wizard.
Directory Harvesting - This must be verified when importing to a server that connects to a different Active Dir ectory or with an Active Directory which is located on a different server.
For more information, refer to Directory
Spam Actions - Some spam actions are only available for Microsoft
®
Exchange environments. If importing set tings to a different environment (for example, on an IIS Server), these actions will not work.
For more information, refer to Spam Actions - What to do with spam emails (page 128).
NOTE
For more information about settings to verify after import refer to: http://go.gfi.com/?pageid=ME_CheckImportSettings
6. On completion, click Exit .
7. GFI MailEssentials automatically attempts to start the services that were stopped in step 1.
GFI MailEssentials 10 Miscellaneous topics | 237
IMPORTANT
There may be other services that are stopped when stopping the IIS Admin service , such as the Simple Mail
Transfer Protocol (SMTP) service. Restart these services manually from the Services applet.
10.9.1 Export/Import settings via command line
Exporting settings via command line
1.
From command prompt, change directory to the GFI MailEssentials installation root folder.
2.
Key in: meconfigmgr /export:”c:\MailEssentials Settings” /verbose /replace
Where:
“C:\MailEssentials Settings” - location where to export files. Replace with the desired destination path.
/verbose - instructs the tool to display progress while copying the files.
/replace - instructs the tool to overwrite existing files in the destination folder.
Screenshot 141: Exporting settings via command line
3.
Restart the services stopped in step 1.
Importing settings via command line
1. Stop the following services:
GFI List Server
GFI MailEssentials AS Scan Engine
GFI MailEssentials Attendant
GFI MailEssentials Autoupdater
GFI MailEssentials AV Scan Engine
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GFI MailEssentials Backend
GFI MailEssentials Enterprise Transfer
GFI MailEssentials Legacy Attendant
GFI MailEssentials Quarantine Action Services
GFI POP2Exchange
IIS Admin service
2. From command prompt, change directory to the GFI MailEssentials installation root folder.
3. Key in: meconfigmgr /import:”c:\MailEssentials Settings” /verbose /replace
Where:
“C:\MailEssentials Settings” - location where the files to import are located. Replace with the path where files to be imported are located.
/verbose - instructs the tool to display progress while copying the files.
/replace - instructs the tool to overwrite existing files in the destination folder.
WARNING
The import process replaces the configuration files with the files found in this folder.
Screenshot 142: Importing settings via command line
4. Restart the services stopped in step 1.
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NOTE
Some imported settings may not be appropriate for the installation of GFI MailEssentials may need to be reconfigured. This is possible for example, DNS settings, domains list and perimeter servers are different from the server from which settings were exported. Click reconfigure important settings.
Yes to launch the GFI MailEssentials Post-Installation wizard to
For more information, refer to Post-Installation Wizard (page 33).
It is also recommended to verify the following settings that are not configured during the Post-Installation wizard.
Directory Harvesting - This must be verified when importing to a server that connects to a different Active Dir ectory or with an Active Directory which is located on a different server.
For more information, refer to Directory
Spam Actions - Some spam actions are only available for Microsoft
®
Exchange environments. If importing set tings to a different environment (for example, on an IIS Server), these actions will not work.
For more information, refer to Spam Actions - What to do with spam emails (page 128).
NOTE
For more information on the settings to verify after import, refer to: http://go.gfi.com/?pageid=ME_CheckImportSettings
10.10 Disabling email processing
Disabling email processing disables all protection offered by GFI MailEssentials and enables all emails (including spam and malicious emails) to get to your user’s mailboxes. Email processing is typically disabled only for troubleshooting purposes.
To enable/disable GFI MailEssentials from processing emails:
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Troubleshooting tab.
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Screenshot 143: The GFI MailEssentials Switchboard: Troubleshooting
2. Click Enable or Disabled to enable or disable email processing
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
3. In the Service Restart Required dialog, click Yes to restart services.
4. Click OK .
10.11 Email backup before and after processing
IMPORTANT
Use this option for troubleshooting purposes only.
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Troubleshooting tab.
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Screenshot 144: The GFI MailEssentials Switchboard: Troubleshooting
2. Select/unselect Keep a copy of every email before and after email processing checkbox to store a copy of each email processed.
All emails are stored in the following locations:
<GFI MailEssentials installation path> \GFI\MailEssentials\AntiSpam\SourceArchives\
<GFI MailEssentials installation path> \GFI\MailEssentials\EmailSecurity\SourceArchives\
NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
3. Click OK .
4. In the Service Restart Required dialog, click Yes to restart services.
5. Click OK .
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10.12 Remoting ports
Remoting ports enable modules in GFI MailEssentials to communicate with each other. By default, GFI MailEssentials uses ports:
9090 - used by the GFI MailEssentials Backend service
9091 - used by the GFI MailEssentials Attendant service
8015 - used by the GFI MailEssentials AutoUpdater service
Ensure that no other applications (except GFI MailEssentials) are listening on these ports. If these ports are used by some other application, change these port numbers to ports that are not used by other applications.
To change the Remoting ports:
1. Launch the GFI MailEssentials Switchboard from Start > Programs > GFI MailEssentials > Switchboard and select
Other tab.
Screenshot 145: Changing Remoting ports
2. In the Remoting Ports applications.
area, change the number of the Remoting port to a one that is not utilized by other
3. Click Apply .
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NOTE
Some services are temporarily stopped while performing this operation. This may affect mail flow and/or email scanning.
4. Click Yes to restart the displayed services.
5. Click OK .
10.13 Monitoring Virus Scanning API
When using Virus Scanning API (VSAPI) to scan the Microsoft ® Exchange Information Store, you can monitor Virus
Scanning API performance using the Performance Monitor MMC.
10.13.1 Performance counter in Windows 2003 Server
To add and view, the performance monitor counter in Windows 2003 Server, follow these steps:
1. Go to Start > Control Panel .
2. In the Control Panel window, double-click Administrative Tools .
3. Double-click Performance , to start the Performance monitor MMC.
4. From the System Monitor viewing pane, click Add to load the Add Counters dialog.
5. From the Performance object dropdown list, select MSExchangeIS .
6. Click Select counters from list .
7. Select any Virus Scan counter you need to add.
For more information, refer to Performance monitor counters
8. Click Add .
9. Repeat steps 7 and 8 to add all the performance counters needed.
10. Click Close .
The counters of added processes are now displayed in the Performance Monitor.
10.13.2 Performance counter in Windows 2008 Server
NOTE
In a Microsoft
®
Exchange Server 2007/2010 environment, the VSAPI performance monitor counters are only available on machines with the Mailbox Server Role installed.
To add and view, the performance monitor counter in Windows 2008 Server, follow these steps:
1. Go to Start > Control Panel > Administrative Tools > Reliability and Performance Monitor .
2. In the monitor dialog, expand Monitoring Tools and select Performance Monitor .
3. From the viewing pane, click Add to load the Add Counters dialog.
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Screenshot 146: Adding VSAPI performance monitor counters in Windows 2008 Server
4. From the Select counters from computer dropdown list, select the computer to monitor.
5. From the list of available counters, expand MSExchangeIS .
6. Select any Virus Scan counter you need to add.
For more information, refer to Performance monitor counters
7. Click Add .
8. Repeat steps 6 and 7 for each process to monitor.
9. Click Ok to apply changes.
The counters of added processes are now displayed in the Performance Monitor.
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Screenshot 147: Monitoring Virus Scan Files Scanned in Windows Server 2008 Performance Monitor
10.13.3 Performance monitor counters
The following VSAPI Performance Monitor counters are available:
Performance Counter
Virus Scan Messages Processed
Virus Scan Messages Processed/sec
Virus Scan Messages Cleaned
Virus Scan Messages Cleaned/sec
Virus Scan Messages Quarantined
Virus Scan Messages Quarantined/sec
Virus Scan Files Scanned
Virus Scan Files Scanned/sec
Virus Scan Files Cleaned
Virus Scan Files Cleaned/sec
Description
A cumulative value of the total number of top-level messages that are processed by the virus scanner.
Represents the rate at which top-level messages are processed by the virus scanner.
Total number of top-level messages that are cleaned by the virus scanner.
Rate at which top-level messages are cleaned by the virus scanner.
Total number of top-level messages that are put into quarantine by the virus scanner.
Rate at which top-level messages are put into quarantine by the virus scanner.
Total number of separate files that are processed by the virus scanner.
Rate at which separate files are processed by the virus scanner.
Total number of separate files that are cleaned by the virus scanner.
Rate at which separate files are cleaned by the virus scanner.
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Performance Counter
Virus Scan Files Quarantined
Virus Scan Files Quarantined/sec
Virus Scan Bytes Scanned
Virus Scan Queue Length
Virus Scan Folders Scanned in
Background
Virus Scan Messages Scanned in
Background
Description
Total number of separate files that are put into quarantine by the virus scanner.
Rate at which separate files are put into quarantine by the virus scanner.
Total number of bytes in all of the files that are processed by the virus scanner.
Current number of outstanding requests that are queued for virus scanning.
Total number of folders that are processed by background scanning.
Total number of messages that are processed by background scanning.
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11 GFI MailEssentials Multi-Server
In environments where there are large email volumes, multiple email gateways and mail servers are usually used to process mail flow efficiently. The physical servers may be on the same site or at different locations. In such instances, GFI
MailEssentials is also deployed on multiple gateway servers.
Without Multi-Install feature implemented, every instance of GFI MailEssentials has its own set of settings, a reporting database and a quarantine store. Configuration of the server, administration of quarantined items and generation of reports need to be done separately on each and every server.
With Multi-Install, all GFI MailEssentials installations are joined together. With this setup settings are synchronized between servers and reporting/quarantine databases are centralized. Configuration and management of GFI
MailEssentials is done on one server for all GFI MailEssentials installations.
When certain features are configured on one GFI MailEssentials instance, these settings are automatically implemented on the other servers within the Multi-Install network. This enables the administrator to apply settings only once.
All reporting and quarantine data is transferred to one server within the network - the Reporting & Quarantine Host. The administrator can manage all quarantined items and generate reports from the Reporting & Quarantine Host.
One server within a GFI MailEssentials Multi-Install network must be set as a Master Server. The Master Server coordinates the operations of the Multi-Install network. It ensures that changes applied on any server within the network are automatically implemented on all servers.
The other servers that are joined to the Master server are the Slave servers. Together, these form the Multi-Install network.
11.1 Features synchronized by Multi-Server
GFI MailEssentials multi-install performs the following actions:
Configuration synchronization :
All configuration settings that are set to be synchronized are retrieved from each server and merged together into a single list.
So, for example, if a whitelist on one machine has 10 whitelist entries, while another machine has 20 entries on the whitelist with 5 of these entries being common to both machines, the end result is a single merged whitelist list with 25 email addresses present on both machines. (5 unique from the first machine, 15 from the second machine and 5 common from both machines).
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This applies for the following filters:
Global Whitelist
Global Blocklist
Personal Whitelist and Blocklist
Auto Whitelist
Content filtering synchronization:
In the case of content filtering there is a difference from how white lists and blocklists are merged.
In the case Keyword Filtering Rules, Attachment Filtering Rules, Advanced Content Filtering Rules and Decompression settings, rules and settings from every server are gathered and merged into a single list. Each filter has an internal "last modified time" which is then used to determine whose rule\setting is the latest. So, for example, if there are 2 rules with same name on 2 different servers, only the latest one is merged.
Every update done on a server is immediately synchronized to all the other servers. This effectively means that changes are immediately available on all servers.
This applies to the following Rules and engines:
Keyword Filtering Rules
Attachment Filtering Rules
Advanced Content Filtering Rules
Decompression Engine
Quarantine\Reporting synchronization
All slave machines upload all the local reporting\quarantine database data to the machine hosting
Quarantine\Reporting. This server would require ample disk space, since it needs to write quarantine of both spam & malware and reporting data.
If there’s no connection to server (for example, a network outage), slave servers save records locally until the connection is re-established. When a machine is set to send all reporting\quarantine data, all current data in the local databases is transferred. This may take some time, given that a large volume of data may be required to be transferred.
Important
All GFI MailEssentials machines in a multi-server environment must have their IP address listed in the Perimeter
SMTP Server Settings. This ensures that emails processed by a GFI MailEssentials server is not reprocessed by another server.
For more information, refer to Perimeter SMTP Server Settings (page 207).
11.2 Setting up Multi-Server
Configuring the GFI MailEssentials Multi-Server feature is a multi-stage process:
1. Plan your Multi-Server installation - See which GFI MailEssentials servers will form part to the GFI MailEssentials Multi-
Server setup and which one will be designated as the master server. If synchronizing the reporting and quarantine data, also decide which computer will be the Reporting and Quarantine host.
2. Install GFI MailEssentials on all the computers - All computers within the GFI MailEssentials multi server installation must have the same version and build of GFI MailEssentials installed on them. We recommend upgrading to the latest version of GFI MailEssentials.
For more information, refer to Getting Started with GFI MailEssentials (page 14).
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Important
All GFI MailEssentials machines in a multi-server environment must have their IP address listed in the Perimeter
SMTP Server Settings. This ensures that emails processed by a GFI MailEssentials server is not reprocessed by another server.
For more information, refer to Perimeter SMTP Server Settings (page 207).
3. Open firewall ports 9095 & 9096 - These TCP ports are used for communications between GFI MailEssentials servers that are joined to the Multi-Server network. Ensure that the master and all salve servers can communicate together via these ports.
4. Configure the Master Server - The master server is tasked with synchronizing the data within the GFI MailEssentials
Multi-Server environment.
For more information, refer to Configuring the master server (page 250).
5. Configure Slave Servers - Slave servers are members of the multi-server environment. Slave servers get the syn chronized configuration settings from the master server and other peers in the multi-install network. A slave server may also be the Reporting and Quarantine host.
For more information, refer to Configuring a slave server (page 252).
6. Configure which configuration settings to sync - GFI MailEssentials provides you with the facility to sync either all the configuration settings or a set of configuration settings.
For more information, refer to Configuring the settings to sync (page 254).
7. Configure Reporting and Quarantine sync - Synching the Reporting and Quarantine data enables you to centralize all your reporting to a single location as well as enables you to have a single location your quarantined emails are stored.
For more information, refer to Configuring Reporting and Quarantine data centralization (page 256).
11.2.1 Configuring the master server
The master server is the server that will be in charge of synchronizing the data between all the GFI MailEssentials instances within the multi-server network. You can only have a singe master server per multi-server network instance. If you have multiple instances of multi-server networks, then each instance must have its own master server.
Important
All GFI MailEssentials machines in a multi-server environment must have their IP address listed in the Perimeter
SMTP Server Settings. This ensures that emails processed by a GFI MailEssentials server is not reprocessed by another server.
For more information, refer to Perimeter SMTP Server Settings (page 207).
1.
Locate and click the Multi-Server node on the GFI MailEssentials console of the computer to designate as the Master
Server.
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Screenshot 148: Setting a Master server
2.
Select Enable Multi-Install mode option and choose Master Server .
3.
Key in the GFI MailEssentials Administrator Credentials. If the default port used by GFI MailEssentials is used by another application, modify the Port used to synchronize data value to an unused port.
NOTE
The username and password provided must exist in the Access Control List for all the GFI MailEssentials installations
(including Slave Servers) that are part of the multi-server network. The password should not expire.
It is recommended that this account is created solely for this purpose.
For more information, refer to Access
4.
Optionally, select Centralize Quarantine and Reporting data within the Multi-Install network option and select the computer that will host the quarantine and reporting data. The reporting and quarantine data host does not necessarily have to be the master server. Any GFI MailEssentials instance within the Multi-Server network can serve as the reporting and quarantine data host. To review and manage data in quarantine and reporting databases, access the web console of the Quarantine and Reporting host.
5.
Click Test to test your settings.
6.
Click Apply .
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11.2.2 Configuring a slave server
A slave server is a server that is part of the GFI MailEssentials multi-server environment. Slave servers get the synchronized configuration settings from the master server and other peers in the multi-install network. Slave servers also send reporting and quarantine data to the designated Reporting and Quarantine host. A slave server may also be the
Reporting and Quarantine host.
Important
All GFI MailEssentials machines in a multi-server environment must have their IP address listed in the Perimeter
SMTP Server Settings. This ensures that emails processed by a GFI MailEssentials server is not reprocessed by another server.
For more information, refer to Perimeter SMTP Server Settings (page 207).
1.
Locate and click the Multi-Server node on the GFI MailEssentials console of the computer to designate as a slave server.
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Screenshot 149: Setting server as a slave server
2.
Select Enable Multi-Install mode option and choose Slave Server .
3.
Key in the Master Server URL and the GFI MailEssentials Administrator credentials.
NOTE
The username and password provided must exist in the Access Control List for all the GFI MailEssentials installations
(including Slave Servers) that are part of the multi-server network. The password should not expire.
It is recommended that this account is created solely for this purpose.
For more information, refer to Access
GFI MailEssentials 11 GFI MailEssentials Multi-Server | 253
4.
Click Advanced and ensure that both the port used to synchronize data and the port used for quarantine and report ing data are correct.
5.
Click Test to test setup.
6.
Click Apply .
11.2.3 Configuring the settings to sync
GFI MailEssentials provides you with the facility to configure which settings to sync between all the computers in the
Multi-Server network.
NOTE
The information in this topic relates only to synching configuration settings. For more information on synching
Reporting and quarantine data, refer to
Configuring Reporting and Quarantine data sync.
To configure the settings to sync:
1.
On the machine configured as the Master Server, locate and click the Multi-Server node.
2.
Click Configuration Sync tab.
GFI MailEssentials 11 GFI MailEssentials Multi-Server | 254
Screenshot 150: Choosing the settings to synchronize
3.
From the Filtered Settings area, select the settings to sync. Available settings are:
Global Whitelist
Global Blocklist
Personal Whitelist and Blocklist
Auto Whitelist
Attachment Filtering Rules
Advanced Content Filtering Rules
Keyword Filtering Rules
Decompression Engine
4.
Click Apply .
GFI MailEssentials 11 GFI MailEssentials Multi-Server | 255
11.2.4 Configuring Reporting and Quarantine data centralization
GFI MailEssentials provides you with the facility to centralize reporting and quarantine data recorded from all the various
GFI MailEssentials instances within a Multi-Server network. Through this feature you will gain a better understanding of what your Multi-Server network is processing.
IMPORTANT
A computer must be designated as the Reporting and Quarantine data host. This computer does not necessarily have to be the master server.
For more information, refer to Configuring the master server (page 250).
To sync Reporting and Quarantine data:
1.
On the each and every machine from where to send the data, locate and click the Multi-Server node.
2.
Click Configuration Sync tab.
Screenshot 151: Multi-Server synchronization features
3.
From the Reporting and Quarantine data area, enable Transfer data from this server to the Multi-Install network option.
GFI MailEssentials 11 GFI MailEssentials Multi-Server | 256
4.
Click Apply.
NOTE
GFI MailEssentials Multi-Server setup reverts to maintaining reporting and quarantine data on the local computer if network connection between the computer sending the data and the Synchronize Quarantine and Reporting data host is lost. On connection being re-established, data is automatically transferred to the Quarantine and Reporting data host.
GFI MailEssentials 11 GFI MailEssentials Multi-Server | 257
12 Troubleshooting and support
12.1 Introduction
This chapter explains how to resolve any issues encountered during installation of GFI MailEssentials. The main sources of information available to solve these issues are:
This manual - most issues can be solved through the information in this section.
GFI Knowledge Base articles
Web forum
Contacting GFI Technical Support
12.2 Common issues
Issue encountered
Dashboard shows no email is being processed; or,
Only inbound or outbound emails are being processed
After installing GFI MailEssentials, some emails show a garbled message body when viewed in
Microsoft ® Outlook
Solution
2. Check for multiple Microsoft ® IIS SMTP virtual servers and ensure that GFI MailEssentials is
3. MX record for domain not configured correctly. Ensure that the MX record points to the
IP address of the server running GFI MailEssentials.
4. If inbound emails are passing through another gateway, ensure that the mail server running on the other gateway forwards inbound emails through GFI MailEssentials.
6. Verify that the SMTP virtual server used by Microsoft
®
Exchange Server for outbound emails is the same SMTP server GFI MailEssentials is bound to.
For more information how to solve this issue refer to: http://go.gfi.com/?pageid=ME_MonitorProcessing
This problem occurs for emails that use one character set for the message header and a different character set for the message body. When such emails are processed by Microsoft ®
Exchange 2003, the emails will be shown garbled in Microsoft ® Outlook. Microsoft ® has released a hotfix to resolve this issue.
For more information refer to: http://go.gfi.com/?pageid=ME_OutlookCharacters and http://go.gfi.com/?pageid=ME_
MessageGarbled
Connect to Microsoft
®
Exchange using IMAP.
For more information refer to: http://go.gfi.com/?pageid=ME_POP3ViewSpam
GFI MailEssentials is configured to move mails blocked as SPAM to a subfolder of the users’ mailbox.
Clients connected to Microsoft ®
Exchange via POP3 are not able to view mails blocked as SPAM.
Auto updates fail however manual download via the GFI MailEssentials configuration works fine
Configuration data cannot be imported.
Ensure that un-authenticated connections are allowed from the GFI MailEssentials machine to http://update.gfi.com
on port 80.
For more information refer to: http://go.gfi.com/?pageid=ME_AutoUpdatesFail
Also check Proxy Server, if applicable.
Ensure that the GFI MailEssentials version and build is identical across both source and target installations.
For more information how to solve this issue refer to: http://go.gfi.com/?pageid=ME_ExpImpBuild
GFI MailEssentials 12 Troubleshooting and support | 258
Issue encountered
Remote commands do not work
Processing of emails is very slow, causing a queue of emails to be built up
Older data not available in database when using Microsoft ® Access.
Solution
Refer to: http://go.gfi.com/?pageid=ME_RemoteCommands
Cause
A number of anti-spam filters perform DNS lookups on senders' domains. This problem may occur when there are DNS issues in the network.
Solution
Check your DNS settings from the
tab.
NOTE: Usage of Google DNS can cause this issue, as well as decrease the spam catching rate by certain filters. It is recommended to NOT use Google DNS (IPv4 8.8.8.8 or
8.8.4.4
or IPv6 2001:4860:4860::8888 or 2001:4860:4860::8844) with GFI
MailEssentials.
When reports.mdb database exceeds 1.7 GB, the database is automatically renamed to
reports_<date>.mdb and a new reports.mdb database is created.
For more information how to solve this issue refer to: http://go.gfi.com/?pageid=ME_ReportDB
Refer to http://go.gfi.com/?pageid=ME_esentutl for more information how to use esentutl.exe to repair the Quarantine Store database.
The Quarantine interface shows error
D10 - Cannot access the Quarantine
Store database. Use a database repair tool (such as esentutl.exe) to repair the database.
Error when receiving emails:
Body type not supported by Remote
Host
Legitimate emails are moved to the
failedmails folder
This error occurs when emails are relayed from the IIS SMTP server to the Microsoft
®
Exchange server. This happens because Microsoft ® Exchange Server versions 4.0, 5.0, and 5.5
are not able to handle 8-bit MIME messages. For instructions how to turn off 8BITMIME in
Windows Server 2003 refer to: http://go.gfi.com/?pageid=ME_TurnOff8bitMIME .
Cause
When GFI MailEssentials is not able to scan incoming emails, these emails are not delivered to the recipient(s) since they may contain malicious content. GFI MailEssentials moves these emails to the following folder: <GFI MailEssentials installation
path>\GFI\MailEssentials\EmailSecurity\failedmails\
Solution
If any legitimate emails are moved to the failedmails folder, these can be manually re-
processed for delivery. For more information, refer to Failed emails (page 225).
For more information of failed emails, refer to: http://go.gfi.com/?pageid=ME_FailedMails
Information on licensing is available on: http://go.gfi.com/?pageid=ME_adminManualEN Do I need to upgrade my license key when upgrading to a new version?
Where is the online version of this manual?
The online version of this manual is available from: http://go.gfi.com/?pageid=GFI_Manuals
GFI MailEssentials 12 Troubleshooting and support | 259
12.3 Scanning engines & filters
Issue encountered
Spam is delivered to users mailbox
Solution
Follow the checklist below to solve this issue:
4. Check if emails are passing through GFI MailEssentials or if GFI MailEssentials is bound to the correct IIS SMTP Virtual Server.
5. Check if '%TEMP%' location (which by default is the ‘C:\Windows\Temp’ folder) contains a lot of files.
6. Check if the number of users using GFI MailEssentials exceeds the number of purchased licenses.
7. Check if whitelist is configured correctly. For more information, refer to Whitelist
8. Check if actions are configured correctly. For more information, refer to Spam Actions
- What to do with spam emails (page 128).
9. Check if Bayesian Analysis filter is configured correctly. For more information, refer to
10. Check the performance of DNS lookups. For more information, refer to DNS Server
For more information how to solve this issue refer to: http://go.gfi.com/?pageid=ME_SpamChecklist
Limit the amount of entries in the lists to 10,000.
Email Blocklist, Whitelist and/or Content
Filtering pages take long to load or appear to hang
SpamRazer updates not downloading
Emails are not being greylisted
Receiving spam emails from my domain.
Emails sent from whitelisted senders are blocked.
1. Ensure that your license key is valid.
2. Ensure that the required ports are open and that your firewall is configured to allow
3. Ensure that, if applicable, proxy server settings for connection to Internet are correct.
To verify the operation of Greylist:
Step 1: Confirm that Greylist is enabled
From the Greylist properties ensure that Enable Greylist is selected.
Step 2: Verify excluded addresses
From the IP and Email exclusions in Greylist properties, ensure that there are no incorrect exclusions (such as *@*.com).
Step 3: Use esentutl.exe to ensure the Greylist database is not corrupted.
For more information refer to: http://go.gfi.com/?pageid=ME_esentutl
Some Spam emails contain a fake 'SMTP FROM' email address consisting of the same domain as the recipient. This may seem as if the email is coming from a local user.
1. Enable Sender Policy Framework from within SpamRazer anti-spam filter, to block
emails originating from spoofed addresses. For more information, refer to SpamRazer
2. Create an SPF record for your domain. For more information refer to http://go.gfi.com/?pageid=ME_CreateSPFRecord .
3. Ensure that SpamRazer is configure to run at a higher priority than the Whitelist
module. For more information, refer to Sorting anti-spam filters by priority (page 131).
1. Whitelisted emails can be blocked if they contain content or attachments that violate the Anti-Malware rules, since these have a higher order of priority than the whitelist.
Ensure that blocked emails do not violate Anti-Malware rules.
2. Ensure that the filter priories are set so that the whitelist is above any kind of filter that is catching the desired email. For more information refer to: http://go.gfi.com/?pageid=ME_BlockedWhitelistedSenders
GFI MailEssentials 12 Troubleshooting and support | 260
Issue encountered
Spam not delivered to Microsoft ®
Exchange sub folder or Spam is not being delivered to the designated subfolder in Outlook in a Microsoft
®
Exchange Server 2010 or later envir onment
Solution
2. Refer to http://go.gfi.com/?pageid=ME_AutodiscoverIssues for detailed information on how to solve this issue.
12.4 Email Management
Issue encountered
No disclaimers are added to outbound emails
Some characters in disclaimer text are not displayed correctly
Emails sent to the list server are converted to Plain Text
Internal users receive a non-delivery report when sending email to list server when GFI MailEssentials is installed on a
Gateway machine
Emails sent from certain users, or sent to certain users are not monitored.
Solution
Disclaimers are only added to outbound emails originating from domains protected by
GFI MailEssentials.
Disclaimers are not added when:
Emails are sent from domains that are not specified in local domains list.
Emails are sent to domains that are in the local domains list as these will be con sidered as internal emails.
Configure Microsoft
®
Outlook not to use automatic encoding and force GPO to use correct encoding.
For more information how to solve this issue refer to: http://go.gfi.com/?pageid=ME_Outlook2003Encoding
Emails sent to the List server are converted to plain text emails only when the original format of the email is RTF. Send email in HTML format to retain original format
For more information how to use the List Server feature if GFI MailEssentials is installed on a gateway refer to: http://go.gfi.com/?pageid=ME_ListServerGateway
Email monitoring rules do not monitor emails sent from or to the GFI MailEssentials administrator and the email address to which the monitored emails are being sent to.
Email monitoring rules are also not applicable for emails sent between internal users of the same information store.
12.5 GFI SkyNet
GFI maintains a comprehensive knowledge base repository, which includes answers to the most common problems. GFI
SkyNet always has the most up-to-date listing of technical support questions and patches. In case that the information in this guide does not solve your problems, next refer to GFI SkyNet by visiting: http://kb.gfi.com/ .
12.6 Web Forum
User to user technical support is available via the GFI web forum. Access the web forum by visiting: http://forums.gfi.com/ .
12.7 Request technical support
If none of the resources listed above enable you to solve your issues, contact the GFI Technical Support team by filling in an online support request form or by phone.
GFI MailEssentials 12 Troubleshooting and support | 261
Online : Fill out the support request form and follow the instructions on this page closely to submit your support request on: http://support.gfi.com/supportrequestform.asp
Phone : To obtain the correct technical support phone number for your region visit: http://www.g
fi.com/company/contact.htm
NOTE
Before contacting Technical Support, have your Customer ID available. Your Customer ID is the online account number that is assigned to you when first registering your license keys in the GFI Customer Area at: http://customers.gfi.com
.
We will answer your query within 24 hours or less, depending on your time zone.
12.8 Documentation
If this manual does not satisfy your expectations, or if you think that this documentation can be improved in any way, let us know via email on: [email protected]
.
GFI MailEssentials 12 Troubleshooting and support | 262
13 Glossary
A
Active Directory
A technology that provides a variety of network services, including LDAP directory services.
AD
Active Directory
Anti-virus software
Software that detects malware such as Trojan horses in emails, files and applications.
Auto-reply
An email reply that is sent automatically to incoming emails.
B
Background Intelligent Transfer Service
A component of Microsoft Windows operating systems that facilitates transfer of files between systems using idle network bandwidth.
Bayesian Filtering
An anti-spam technique where a statistical probability index based on training from users is used to identify spam.
BITS
Background Intelligent Transfer Service
Blocklist
A list of email addresses or domains from whom email is not to be received by users
Botnet
A network of infected computers that run autonomously and are controlled by a hacker/cracker.
C
CIDR
Classless Inter-Domain Routing
Classless Inter-Domain Routing
An IP addressing notation that defines a range of IP addresses.
D
Decompression engine
A scanning module that decompresses and analyzes archives (for example, .zip and .rar files) attached to an email.
GFI MailEssentials 13 Glossary | 263
Demilitarized Zone
An internet-facing section of a network that is not part of the internal network. Its purpose typically is to act as a gateway between internal networks and the internet.
Directory harvesting
Email attacks where known email addresses are used as a template to create other email addresses.
Disclaimer
A statement intended to identify or limit the range of rights and obligations for email recipients
DMZ
Demilitarized Zone
DNS
Domain Name System
DNS MX
Mail Exchange
Domain Name System
A database used by TCP/IP networks that enables the translation of hostnames to IP addresses and provides other domain related information.
E
Email headers
Information that precedes the email text (body) within an email message. This includes the sender, recip ient, subject, sending and receiving time stamps, etc.
Email monitoring rules
Rules which enable the replication of emails between email addresses.
Exploit
An attack method that uses known vulnerabilities in applications or operating systems to compromise the security of a system.
F
False negatives
Spam emails that are not detected as spam.
False positives
Legitimate emails that are incorrectly identified as spam.
G
Gateway
The computer (server) in a LAN that is directly connected to an external network. In GFI MailSecurity, gate way refers to the email servers within the company that first receive email from external domains.
GFI MailEssentials 13 Glossary | 264
Greylist filter
An anti-spam filter that blocks emails sent from spammers that do not resend a message when a retry message is received.
H
Ham
Legitimate e-mail
HTML Sanitizer
A filtering module within GFI MailSecurity that scans and removes html scripting code from emails.
HTTP
Hypertext Transfer Protocol - A protocol used to transfer hypertext data between servers and internet browsers.
I
IIS
Internet Information Services
IMAP
Internet Message Access Protocol
Internet Information Services
A set of Internet-based services created by Microsoft Corporation for internet servers.
Internet Message Access Protocol
One of the two most commonly used Internet standard protocols for e-mail retrieval, the other being
POP3.
L
LDAP
Lightweight Directory Access Protocol
Lightweight Directory Access Protocol
An application protocol used to query and modify directory services running over TCP/IP.
List server
A server that distributes emails sent to discussions lists and newsletter lists, and manages subscription requests.
M
Mail Exchange
The DNS record used to identify the IP addresses of the domain's mail servers.
GFI MailEssentials 13 Glossary | 265
Malware
All malicious types of software that are designed to compromise computer security and which usually spread through malicious methods.
MAPI
Messaging Application Programming Interface
MDAC
Microsoft Data Access Components
Messaging Application Programming Interface
A messaging architecture and a Component Object Model based API for Microsoft Exchange.
Microsoft Data Access Components
A Microsoft technology that gives developers a homogeneous and consistent way of developing soft ware that can access almost any data store.
Microsoft Message Queuing Services
A message queue implementation for Windows Server operating systems.
MIME
Multipurpose Internet Mail Extensions
MSMQ
Microsoft Message Queuing Services
Multipurpose Internet Mail Extensions
A standard that extends the format of e-mail to support text other than ASCII, non-text attachments, mes sage bodies with multiple parts and header information in non-ASCII character sets.
N
NDR
Non Delivery Report
Non Delivery Report
An automated electronic mail message sent to the sender on an email delivery problem.
P
Perimeter server/gateway
The host in a LAN that is directly connected to an external network. In GFI MailEssentials perimeter gate way refers to the email servers within the company that first receive email from external domains.
PGP encryption
A public-key cryptosystem often used to encrypt emails.
Phishing
The process of acquiring sensitive personal information with the aim of defrauding individuals, typically through the use of fake communications
GFI MailEssentials 13 Glossary | 266
POP2Exchange
A system that collects email messages from POP3 mailboxes and routes them to mail server.
POP3
Post Office Protocol ver.3
Post Office Protocol ver.3
A client/server protocol for storing emails so that clients can connect to the POP3 server at any time and read the email. A mail client makes a TCP/IP connection with the server and by exchanging a series of commands, enable users to read the email.
Public folder
A common folder that allows Microsoft Exchange user to share information.
Q
Quarantine
A email database where emails detected as spam and/or malware are stored in a controlled enviornment.
Quarantined emails are not a threat to the network enviorment.
Quarantine Store
A central repository within GFI MailSecurity where all blocked emails are retained until they are reviewed by an administrator.
R
RBL
Realtime Blocklist
Realtime Blocklist
Online databases of spam IP addresses. Incoming emails are compared to these lists to determine if they are originating from blocked users.
Recursive archives
Archives that contain multiple levels of sub-archives (that is, archives within archives). Also known as nes ted archives.
Remote commands
Instructions that facilitate the possibility of executing tasks remotely.
RSS feeds
A protocol used by websites to distribute content (feeds) that frequently changes (for example news items) with its subscribers.
S
Secure Sockets Layer
A protocol to ensure an integral and secure communication between networks.
GFI MailEssentials 13 Glossary | 267
Simple Mail Transport Protocol
An internet standard used for email transmission across IP networks.
SMTP
Simple Mail Transport Protocol
Spam actions
Actions taken on spam emails received, e.g. delete email or send to Junk email folder.
SSL
Secure Sockets Layer
T
Trojan horse
Malicious software that compromises a computer by disguising itself as legitimate software.
V
Virus scanning engine
A virus detection technology implemented within antivirus software that is responsible for the actual detection of viruses.
W
WebDAV
An extension of HTTP that enables users to manage files remotely and interactively. Used for managing emails in the mailbox and in the public folder in Microsoft Exchange.
Whitelist
A list of email addresses and domains from which emails are always received
Z
Zombie
An infected computer that is made part of a Botnet through malware.
GFI MailEssentials 13 Glossary | 268
14 Index
A
Active Directory 9, 12, 17, 23, 32, 38, 77, 90, 96, 143, 149,
193, 197, 213-214, 219, 235, 237, 240
Antivirus 8, 16-17, 31, 48, 61-62, 65, 68, 71, 75, 78, 174, 185
Attachment Filtering 9, 160, 175, 210, 213, 249, 255
B
Bayesian Analysis 9, 17, 91, 118, 120, 138, 141-142, 210, 260
C
D
Dashboard 42-43, 46, 48-50, 258
Database 25-26, 42, 44, 49-50, 55-56, 59, 80, 90, 94, 98, 110,
119-120, 139, 203-204, 213, 248-249, 259-260
Directory harvesting 7, 9, 12, 38, 90, 96, 132, 210, 237, 240
DMZ 11, 17-18, 32, 150, 194, 213
DNS Server 20, 24, 34, 103, 115, 137
Domain 8, 17, 23-24, 32, 96, 104, 107-108, 115, 123, 142,
145-147, 149, 194, 197, 200, 213-214, 218, 235, 258
E
Email Blocklist 9, 90, 98, 100, 138, 152, 210, 260
Email monitoring 7-8, 206, 261
F
firewall 11, 16, 31, 194, 215, 250, 260
G
gateway 11, 14-18, 23, 31, 61, 64, 68, 71, 74, 106, 180, 186,
Greylist 10, 39, 90, 110, 133, 210
H
Header checking 9, 91, 112-113, 210
GFI MailEssentials
I
IIS 12, 15, 18, 21, 24, 30, 110, 195, 212, 215, 218, 221, 237,
Internet 7, 15, 18, 24, 35, 122, 132, 208, 210, 231, 260
IP 19, 24, 34, 58, 87, 101, 103, 106, 108, 110, 115, 120, 125,
194, 208, 210-211, 228, 249-250, 252, 260
IP DNS Blocklist 9, 16, 90, 130, 137
K
Keyword checking 9, 91, 116, 138, 210
L
Legitimate email 10, 39, 91, 118, 123
Lotus Domino 11, 17, 20, 23, 26
M
Microsoft Exchange 15, 17, 77, 130, 198, 225, 232
N
New Senders 7, 10, 91, 127, 131, 210
O
P
Performance 19, 39, 57, 77, 120, 125, 226, 244, 260
Phishing 9, 17, 90, 94, 210, 234
POP2Exchange 22, 42, 50, 228, 237, 239
Post-Installation 33, 237, 240
Index | 269
Q
Quarantine 8, 12, 22, 33, 37, 40, 44, 49, 62, 66, 69, 72, 75, 80,
84, 129, 158, 163, 168, 171, 177, 187, 189, 194, 209,
219, 221-222, 237, 239, 248-249, 251-252, 254, 256,
R
S
Sender Policy Framework 9, 90-91, 106, 210, 260
SMTP Server 17-18, 32, 109-110, 207, 258
SMTP Virtual Server 19, 32, 215
SpamRazer 9, 16, 90-91, 129, 210, 260
U
Updates 17, 42, 48-49, 61, 63, 67, 70, 73, 76, 82, 85, 91, 95,
V
Virtual directory 7, 33, 149, 221-222
W
Whitelist 8, 10, 13, 87, 91-92, 101, 106, 108, 115, 123, 126-
127, 131, 138, 141, 148, 152, 210, 248, 255, 260
Wizard 14, 18, 30, 33, 38, 120-121, 212
GFI MailEssentials Index | 270
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