Administrator's Guide

Administrator's Guide
Firmware Version 4.x
Barracuda Spam & Virus Firewall Administrator’s Guide
Barracuda Networks Inc.
3175 S. Winchester Blvd
Campbell, CA 95008
http://www.barracuda.com
Copyright Notice
Copyright 2004-2009, Barracuda Networks
www.barracuda.com
v4.x-090623-06-1119
All rights reserved. Use of this product and this manual is subject to license. Information in this document is subject to change without notice.
Trademarks
Barracuda Spam & Virus Firewall is a trademark of Barracuda Networks. All other brand and product names mentioned in this document are
registered trademarks or trademarks of their respective holders.
2
Barracuda Spam & Virus Firewall Administrator’s Guide
Contents
Chapter 1 – Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 9
Overview . . . . . . . . . . . . . . . . . . .
What This Guide Covers . . . . . . . . .
Easy Administration . . . . . . . . . . . .
12 Layers of Virus and Spam Protection .
Energize Updates Maximize Protection . .
Barracuda Central . . . . . . . . . .
How Energize Updates Defeat Spam
Barracuda Spam & Virus Firewall Models . .
Contacting Technical Support. . . . . . . . .
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C h a p t e r 2 – B a r r a c u d a Spa m & Vir u s F i r e w a l l C o n c e p ts . 17
Twelve Layers of Defense . . . . . . . . . . . . . . . . . . .
Maximizing Efficiency and Performance of Spam Scanning
Connection Management Layers . . . . . . . . . . . . . . . .
Denial of Service Protection. . . . . . . . . . . . . . . . .
Rate Control . . . . . . . . . . . . . . . . . . . . . . . . .
IP Analysis . . . . . . . . . . . . . . . . . . . . . . . . .
Sender Authentication. . . . . . . . . . . . . . . . . . . .
Recipient Verification . . . . . . . . . . . . . . . . . . . .
Mail Scanning Layers . . . . . . . . . . . . . . . . . . . . . .
Virus Scanning . . . . . . . . . . . . . . . . . . . . . . .
User-specified rules (custom policy) . . . . . . . . . . . .
Fingerprint Analysis . . . . . . . . . . . . . . . . . . . . .
Intent Analysis. . . . . . . . . . . . . . . . . . . . . . . .
Image Analysis . . . . . . . . . . . . . . . . . . . . . . .
Bayesian Analysis . . . . . . . . . . . . . . . . . . . . . .
Spam Scoring . . . . . . . . . . . . . . . . . . . . . . . .
Predictive Sender Profiling . . . . . . . . . . . . . . . . . . .
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C h a p t e r 3 – G e t t i n g Sta r t e d . . . . . . . . . . . . . . . . . . . . . . 25
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checklist for Unpacking . . . . . . . . . . . . . . . . . . . . . .
Installation Examples . . . . . . . . . . . . . . . . . . . . . . .
Barracuda Spam & Virus Firewall Behind Corporate Firewall
Barracuda Spam & Virus Firewall in the DMZ . . . . . . . .
Clustering the Barracuda Spam & Virus Firewall . . . . . . .
Install the Barracuda Spam & Virus Firewall . . . . . . . . . . .
APC UPS Support. . . . . . . . . . . . . . . . . . . . . . . . .
Configure IP Address and Network Settings . . . . . . . . . . .
Configure your Corporate Firewall . . . . . . . . . . . . . . . .
Initial Configuration of the System . . . . . . . . . . . . . . . . . .
Activate Your Subscriptions . . . . . . . . . . . . . . . . . . . .
Product Activation . . . . . . . . . . . . . . . . . . . . . . . . .
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3
Update the Barracuda Spam & Virus Firewall Firmware . . . .
Update Definitions. . . . . . . . . . . . . . . . . . . . . . . .
Routing Email . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Route Incoming Email to the Barracuda Spam & Virus Firewall
Configuring Basic Scanning of Outgoing Mail. . . . . . . . . .
Outbound Message Footer . . . . . . . . . . . . . . . . .
Administrative Settings and the Web Interface . . . . . . . . . . .
Global Versus Domain Level Administration . . . . . . . . . .
Controlling Access to the Web Interface . . . . . . . . . . . .
Customizing the Appearance of the Web interface . . . . . . .
Changing the Language of the Web Interface . . . . . . .
Setting the Time Zone of the System . . . . . . . . . . . . . .
Enabling SSL for Administrators and Users. . . . . . . . . . .
Tune and Monitor the Default Spam and Virus Settings . . . . . .
Spam Scoring - Block, Tag and Quarantine . . . . . . . . . . .
Monitor and Classify Incoming Emails . . . . . . . . . . . . .
Virus Checking and Notifications . . . . . . . . . . . . . . . .
Attachment Block Notifications . . . . . . . . . . . . . . .
Viewing Performance Statistics . . . . . . . . . . . . . . . . . . .
Setting up Quarantine . . . . . . . . . . . . . . . . . . . . . . .
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C h a p t e r 4 – S e c u r i n g t h e B a r r a c u d a Spa m & Vir u s F i r e w a l l 45
Securing Network Access . . . . . . . . . . . . . . . . . . . . . .
SSL Certificates . . . . . . . . . . . . . . . . . . . . . . . . . .
Secure Links in Notification Emails . . . . . . . . . . . . . . . .
Limiting Access to the API . . . . . . . . . . . . . . . . . . . .
Tracking Changes to the Configuration and User Login Activities
Limiting User Access . . . . . . . . . . . . . . . . . . . . . . . . .
Securing User Access With Single Sign On. . . . . . . . . . . .
LDAP, POP or RADIUS Authentication . . . . . . . . . . .
Limiting User Access to a Clustered System . . . . . . . . . . .
Advanced Email Security Policy . . . . . . . . . . . . . . . . . . .
SMTP/TLS (Transport Layer Security) encryption . . . . . . . .
Securing the Outbound Relay of Email . . . . . . . . . . . . . .
Invalid Bounce Suppression. . . . . . . . . . . . . . . . . . . .
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C h a p t e r 5 – A d v a n c e d Spa m F i l t e r i n g P o l i c y . . . . . . . . . 51
Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Rate Control Works . . . . . . . . . . . . . . . . . . . . .
When Rate Control Takes Effect . . . . . . . . . . . . . . . . .
Exemptions from Rate Control . . . . . . . . . . . . . . . . . .
IP Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trusted Forwarders . . . . . . . . . . . . . . . . . . . . . . . .
IP Block and Accept Precedence . . . . . . . . . . . . . . . . .
IP Reputation . . . . . . . . . . . . . . . . . . . . . . . . . . .
Barracuda IP Reputation (BBL) . . . . . . . . . . . . . . . . . .
Exempting IP Addresses from the BBL and Other Blacklists
Subscribing to External Blacklist Services . . . . . . . . . .
Sender Whitelisting - Precedence. . . . . . . . . . . . . . . . .
Reverse DNS Blocking whitelisting . . . . . . . . . . . . . . . .
4
Barracuda Spam & Virus Firewall Administrator’s Guide
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Content Analysis . . . . . . . . . . . . . . . . . . . . . . . . .
Custom Content Filters . . . . . . . . . . . . . . . . . . . .
Attachment Filtering . . . . . . . . . . . . . . . . . . .
Blocking Email by Country . . . . . . . . . . . . . . . . . .
Fingerprint Analysis . . . . . . . . . . . . . . . . . . . . . .
Intent Analysis. . . . . . . . . . . . . . . . . . . . . . . . .
Image Analysis . . . . . . . . . . . . . . . . . . . . . . . .
Bayesian Analysis . . . . . . . . . . . . . . . . . . . . . . .
How Bayesian Analysis Works . . . . . . . . . . . . . .
Global Bayesian Filtering Versus Per-User . . . . . . .
Getting the Best Accuracy From the Bayesian Database
When to Use Bayesian Analysis . . . . . . . . . . . . .
Outlook and Lotus Notes Plugins . . . . . . . . . . . .
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C h a p t e r 6 – A d v a n c e d C o n f i g u r a t i o n . . . . . . . . . . . . . . . 61
Sender Authentication . . . . . . . . . . . . . . . . . . . .
Mail Protocol (SMTP) Checking . . . . . . . . . . . . . .
Sender Spoof Protection . . . . . . . . . . . . . . . . .
Invalid Bounce Suppression. . . . . . . . . . . . . . . .
Sender Policy Framework (SPF) . . . . . . . . . . . . .
Domain Keys (DKIM) Inspection . . . . . . . . . . . . .
Custom policies . . . . . . . . . . . . . . . . . . . . . .
Recipient Verification . . . . . . . . . . . . . . . . . . . . .
LDAP lookup . . . . . . . . . . . . . . . . . . . . . . .
Explicit Accepted Users (Valid Recipients) . . . . . . . .
Alias Linking . . . . . . . . . . . . . . . . . . . . .
Remote IMAP/POP Accounts. . . . . . . . . . . . . . . . .
Clustering the Barracuda Spam & Virus Firewall . . . . . . .
Setting Up Clustered Systems . . . . . . . . . . . . . .
Centralized Policy Management With a Quarantine Host .
Redundancy of user quarantine data on the cluster .
Data Not Synchronized Across the Cluster . . . . . . . .
Advanced Networking . . . . . . . . . . . . . . . . . . . .
Port Forwarding . . . . . . . . . . . . . . . . . . . . . .
Configuring the Network Interfaces . . . . . . . . . . . .
Static Routes . . . . . . . . . . . . . . . . . . . . . . .
Loopback Adapter . . . . . . . . . . . . . . . . . . . . .
Non-Delivery Reports (NDRs) . . . . . . . . . . . . . . . .
Spam Bounce Non-Delivery Reports (NDRs) . . . . . . .
Reducing Backscatter . . . . . . . . . . . . . . . . . .
Remote Administration . . . . . . . . . . . . . . . . . . . .
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C h a p t e r 7 – M a n a g i n g Q u a r a n t i n e . . . . . . . . . . . . . . . . . 73
How Quarantine Works . . . .
Quarantine Options . . . . . .
Turning Quarantine Off . .
Using Global Quarantine .
Using Per-user Quarantine
Global Quarantine . . . . . .
Per-User Quarantine . . . . .
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5
Where Do the Quarantined Messages Go? . . . . . . . . . . . .
Linking Domains for One Quarantine Inbox . . . . . . . . .
Domain Level Settings . . . . . . . . . . . . . . . . . . . . . .
The Quarantine Inbox . . . . . . . . . . . . . . . . . . . .
Alias Linking . . . . . . . . . . . . . . . . . . . . . . . . .
Controlling Access to Account Features . . . . . . . . . . . . .
Overriding Default Account Features Settings . . . . . . . .
Assigning Quarantine Inbox Permissions to Selected Users .
Quarantine Notifications. . . . . . . . . . . . . . . . . . . . . .
Retention Policy and Purging Old Messages. . . . . . . . . . .
Minimizing Excessive Storage of Email . . . . . . . . . . .
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77
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79
80
80
81
C h a p t e r 8 – M a n a g i n g A c c o u n ts a n d D o m a i n s . . . . . . . . 83
Creating and Managing Accounts . . . . . . . . . . . .
Automatic Account Creation. . . . . . . . . . . . . .
When to Disable Automatic Creation of Accounts
Manually Creating User Accounts . . . . . . . . . . .
Account Creation by Users . . . . . . . . . . . .
Single Sign-On and User Authentication . . . . .
Assigning Features to User Accounts . . . . . . . . .
Role-based Administration . . . . . . . . . . . . . . . .
Roles and Navigating the Web Interface . . . . . . .
Editing Accounts and Assigning Roles . . . . . . . .
User Role . . . . . . . . . . . . . . . . . . . . . . .
Helpdesk Role. . . . . . . . . . . . . . . . . . . . .
Helpdesk Role - All_Domains Permissions . . .
Some Helpdesk Use Cases . . . . . . . . . . .
Domain Admin Role . . . . . . . . . . . . . . . . . .
Domain Admin Role - All_Domains Permissions .
Creating and Managing Domains. . . . . . . . . . . . .
Adding and Deleting Domains. . . . . . . . . . . . .
Domain Configuration . . . . . . . . . . . . . . . . .
Changing a Domain’s Settings . . . . . . . . . . . .
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84
84
85
85
85
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86
87
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90
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91
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93
95
95
96
96
C h a p t e r 9 – M o n i t o r i n g t h e S y s t e m . . . . . . . . . . . . . . . . 97
Viewing Performance Statistics . . . . . . . . . . . .
Inbound and Outbound Message Queues . . . .
Retrying Outbound Messages . . . . . . . .
The Message Log. . . . . . . . . . . . . . . . . . .
Setting up Alerts . . . . . . . . . . . . . . . . . . .
Setting up Emailed System Alerts . . . . . . . . .
Setting up SNMP Query and Alerts . . . . . . . .
Reporting . . . . . . . . . . . . . . . . . . . . . . .
Generating System Reports . . . . . . . . . . . .
Automating the Delivery of Daily System Reports
Using the Task Manager to Monitor System Tasks . .
Troubleshooting. . . . . . . . . . . . . . . . . . . .
Diagnostic Tools . . . . . . . . . . . . . . . . . .
Testing Network Connectivity . . . . . . . .
Connect to Barracuda Support Servers . . .
6
Barracuda Spam & Virus Firewall Administrator’s Guide
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. 98
. 98
. 98
. 99
100
100
100
102
102
102
103
104
104
104
104
Using a Syslog Server to Centrally Monitor System Logs. . . . . . . . . . . 104
Front Panel Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . 105
C h a p t e r 1 0 – M a i n t e n a n c e . . . . . . . . . . . . . . . . . . . . . . 107
Updating the Firmware and Definitions . . . . . . . . . . . . . . . .
Updating the Firmware on your Barracuda Spam & Virus Firewall
Updating the Definitions from Energize Updates . . . . . . . . .
Backing up and Restoring Your System . . . . . . . . . . . . . . .
Three Types of Backups Available . . . . . . . . . . . . . .
Restoring a Backup . . . . . . . . . . . . . . . . . . . . .
Reloading, Restarting, and Shutting Down the System . . . . . . .
Using the Built-in Troubleshooting Tools . . . . . . . . . . . . . . .
Rebooting the System in Recovery Mode . . . . . . . . . . . . . .
Reboot Options . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a Failed System . . . . . . . . . . . . . . . . . . . .
Barracuda Instant Replacement Service . . . . . . . . . . .
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108
108
108
109
109
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.110
. 111
.112
.112
.113
113
A p p e n d i x A – A b o u t t h e H a r d w a r e . . . . . . . . . . . . . . . . 115
Hardware Compliance. . . . . .
Notice for the USA . . . . .
Notice for Canada . . . . .
Notice for Europe (CE Mark)
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.115
115
115
115
A p p e n d i x B – L i m i t e d Wa r r a n t y a n d L i c e n s e . . . . . . . . 117
Limited Warranty . . . . . . . . .
Exclusive Remedy. . . . . . . . .
Exclusions and Restrictions . . . .
Software License . . . . . . . . .
Energize Update Software License
Open Source Licensing . . . . . .
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123
I n d e x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
7
8
Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 1
Introduction
This chapter provides an overview of the Barracuda Spam & Virus Firewall and includes the
following topics:
Overview ........................................................................................... .10
Barracuda Spam & Virus Firewall Models ...................................... .14
Contacting Technical Support........................................................... .16
Introduction 9
Overview
The Barracuda Spam & Virus Firewall is an integrated hardware and software solution that provides
powerful and scalable spam and virus-blocking capabilities without affecting the performance of your
mail servers. With no per-user license fee, the Barracuda Spam & Virus Firewall can be scaled to
support hundreds of thousands of active email users.
What This Guide Covers
This guide provides concepts and general guidance the administrator needs to understand how to best
configure the Barracuda Spam & Virus Firewall according to the organization’s deployment needs,
policies and email infrastructure. General discussion of the powerful features of the Barracuda Spam
& Virus Firewall are presented here while detailed, procedural configuration steps are given in the
rich online help of the Web interface. To view the online help, click the question mark icon on the
right side of any page of the Web interface.
When referring to specific feature settings, this guide will specify the name of the tab in the Web
interface in uppercase letters, followed by a ( > ) and the actual page name. For example, you can view
system email and performance statistics and subscription status on the BASIC > Status page.
Easy Administration
The powerful Web interface of the Barracuda Spam & Virus Firewall allows for convenient
configuration and management of spam and virus filtering policies and email security settings from
one central location.
The administrator can elect to receive alerts and notifications from the Barracuda Spam & Virus
Firewall at any email address and has message and system logs available to quickly assess the status
of the system. Key email statistics and system performance can be viewed at a glance on the BASIC
> Status page of the Web interface.
To minimize ongoing administration associated with security, Barracuda Central, the 24x7 operations
center operated by Barracuda Networks to monitor and block the latest Internet threats, automatically
delivers Energize Updates to your Barracuda Spam & Virus Firewall every hour (see below). These
updates include the latest spam and virus definitions for the most current protection against viruses
and other security threats.
10
Barracuda Spam & Virus Firewall Administrator’s Guide
12 Layers of Virus and Spam Protection
Using the Web interface, you can configure up to twelve defense layers that protect your users from
spam and viruses. Every “good’ email message passes through these 12 layers, which include five
connection management layers and seven mail scanning layers:
•
•
•
•
•
•
•
•
•
•
•
•
Denial of service
Rate control
IP Reputation Analysis
Sender Authentication
Recipient Verification
Virus Scanning
Custom policies
Spam Fingerprint Analysis
Intent Analysis
Image Analysis
Bayesian Analysis
Rule-based spam scoring
The following figure shows each of these defense layers in action and indicates how six of the twelve
layers of defense are updated constantly by Barracuda Networks Energize Updates:
Figure 1.1: Twelve Layers of Defense
During the connection management process, emails are filtered through five defense layers to verify
authenticity of envelope information and any inappropriate incoming mail connections are dropped
even before receiving the message. Any emails that survive the connection verification process must
then undergo a thorough mail scanning process that involves an additional seven defense layers of
message analysis The algorithms and techniques used by the Barracuda Spam & Virus Firewall are
continuously updated via the hourly Barracuda Energize Updates service to stay ahead of spam trends
as they emerge.
Introduction 11
Energize Updates Maximize Protection
Barracuda Central
To provide you with maximum protection against the latest types of spam and virus attacks, engineers
at Barracuda Central monitor the Internet for trends in spam and virus attacks, collecting data from
worldwide collection points. These updates are then automatically updated around the clock to your
Barracuda Spam & Virus Firewall via the Energize Updates feature.
Figure 1.2: Constant Updates to Barracuda Central
By identifying spam and virus trends at an early stage, the team at Barracuda Central can quickly
develop new and improved blocking techniques that are automatically made available to your
Barracuda Spam & Virus Firewall.
Energize Updates provide your Barracuda Spam & Virus Firewall with the following benefits:
•
•
•
•
•
12
Barracuda Reputation (seeBarracuda IP Reputation (BBL), p. 55)
Spam definitions
Security definitions
Virus definitions
Access to the latest firmware
Barracuda Spam & Virus Firewall Administrator’s Guide
Figure 1.3: Energize Updates from Barracuda Central Delivers New Spam and Virus Definitions
How Energize Updates Defeat Spam
The Barracuda Spam & Virus Firewall scrutinizes all the characteristics of a message and uses a
complex system of scores to determine whether or not a message is spam. When an email reaches the
spam scoring filter, the Barracuda Spam & Virus Firewall assigns scores to all the properties of the
message.
For example, the Barracuda Spam & Virus Firewall scrutinizes:
• A message’s header and subject line for offensive characters or words
• The percentage of HTML in the message
• Whether a message contains an “unsubscribe” link
These properties (along with many others) help the Barracuda Spam & Virus Firewall to determine
the spam score for a message that you’ll see displayed on the Message Log page of the Web interface.
By default, Energize Updates are set to automatically keep the spam rules and scores up-to-date so
that the Barracuda Spam & Virus Firewall can quickly counteract the latest techniques used by
spammers.
Introduction 13
Barracuda Spam & Virus Firewall Models
The Barracuda Spam & Virus Firewall comes in a variety of models. Refer to the following table for
the capacity and features available on each model:
Table 1.1:
Model
100
Model
200
Active email
users
1–50
1–500
300–
1,000
1,000–
5,000
3,000–
10,000
8,000–
22,000
15,000–
30,000
25,000–
100,000
Domains
10
50
250
500
5,000
5,000
5,000
5,000
10 GB
50 GB
100 GB
200 GB
250 GB
750 GB
Feature
Quarantine
Storage
Model
300
Model
600
Model
800
Model
900
Model
1000
Compatible
with all mail
servers








Hardened
and secure
OS








Spam
blocking








Virus
scanning








Outbound
Email
Filtering








STARTTLS
encryption
support








Per-user
settings and
quarantine






MS
Exchange/LD
AP
Accelerator






Syslog
support






















SNMP/API
Per Domain
Settings
Clustering
Redundant
Disk Array
(RAID)
14
Model
400
Barracuda Spam & Virus Firewall Administrator’s Guide
Hot Swap Hot Swap Hot Swap Hot Swap
Table 1.1:
Feature
Model
200
Model
300
Model
400
Model
600
Model
800
Model
900
Model
1000
Per-user
score settings




Customizable
Branding




Hot Swap
Redundant
Power Supply
Introduction 15
Model
100
Hot Swap Hot Swap Hot Swap
Contacting Technical Support
To contact Barracuda Networks Technical Support:
• By phone: call 1-408-342-5400, or if you are in the United States, (888) Anti-Spam, or (888)
268-4772
• By email: use support@barracuda.com
• Online: visit http://www.barracuda.com/support and click on the Support Case Creation link.
There is also a Barracuda Networks Support Forum available where users can post and answer other
users’ questions. Register and log in at http://forum.barracuda.com.
16
Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 2
Barracuda Spam & Virus Firewall Concepts
This chapter introduces the general topics that will help you understand what your Barracuda Spam
& Virus Firewall can do and how to approach configuring the features that are important to your
particular deployment and organization policies. The Getting Started chapter walks through initial
setup and configuration of the system to get you up and running.
Twelve Layers of Defense .................................................................. 18
Connection Management Layers ....................................................... 19
Mail Scanning Layers ........................................................................ 21
Predictive Sender Profiling................................................................ 23
Barracuda Spam & Virus Firewall Concepts 17
Twelve Layers of Defense
Understanding each of the 12 layers of defense prepares you to make decisions about which - if not
all- of the connection and mail scanning features to enable and tune for the best combination of
performance and accuracy of the Barracuda Spam & Virus Firewall. More detailed information about
features that support each layer, pros and cons, as well as Barracuda Networks’ recommendations are
addressed in chapter 5, Advanced Spam Filtering Policy and chapter 6, Advanced Configuration.
In general you can configure one of either Block, Quarantine, Tag or Allow actions for messages
identified as spam by various scanning layers. Note that using the Quarantine or Tag actions with
some layers may use more system resources than Block or Allow actions.
Maximizing Efficiency and Performance of Spam Scanning
Using Rate Control, Barracuda Reputation (realtime RBLs) and Recipient Verification, as described
below, can maximize filtering performance of the Barracuda Spam & Virus Firewall. These layers
have the greatest impact on filtering speed and performance relative to all the other layers such that
any inappropriate incoming mail connections are dropped even before receiving the message.
18
Barracuda Spam & Virus Firewall Administrator’s Guide
Connection Management Layers
These layers provide the most value in your Barracuda Spam & Virus Firewall deployment as they
identify unwanted email messages and block them before accepting the message body for further
processing. The Connection Management layers generally require less processing time than the seven
scanning and message analysis layers that follow. For the average small or medium business, more
than half of the total email volume can be blocked using Connection Management techniques.
Extremely large Internet Service Providers (ISPs) or even small Web hosts, while under attack, may
observe block rates at the Connection Management layers exceeding 99 percent of total email volume.
Denial of Service Protection
Built on a hardened and secure Linux operating system, the Barracuda Spam & Virus Firewall
receives email on behalf of the organization, insulating your organization’s mail server from
receiving direct Internet connections and associated threats.
Rate Control
Automated spam software can be used to send large amounts of email to a single mail server. To
protect the email infrastructure from these flood-based attacks, the Barracuda Spam & Virus Firewall
counts the number of incoming connections from a particular IP address during a 30 minute interval
and throttles the connections once a particular threshold is exceeded. See Rate Control, page 52, for
more on configuring this feature.
IP Analysis
After applying rate controls based on IP address, the Barracuda Spam & Virus Firewall performs
analysis on the IP address based on the following:
•
•
•
•
Barracuda Reputation - this feature leverages data on network addresses and domain names
collected from spam traps and throughout other systems on the Internet. The sending histories
associated with the IP addresses of all sending mail servers are analyzed to determine the
likelihood of legitimate messages arriving from those addresses. IP addresses of incoming
connections are compared to the Barracuda Reputation list, if enabled, and incoming messages
are either blocked, tagged or quarantined.
Barracuda IP Whitelist (External RBL IP Exemption Range) - The Barracuda is a database
of IP addresses known to follow good email practices. Messages received from IP addresses on
this list are scanned for viruses and will be blocked should a virus be detected, and optionally
undergo other spam scanning as well.
External block lists - Also known as real-time block lists (RBLs) or DNS block lists
(DNSBLs). Several organizations maintain external block lists of known spammers.
Allowed and blocked IP address lists: Customer-defined policy for allowed and blocked IP
addresses. By listing trusted mail servers by IP address, administrators can avoid spam scanning
of good email, both reducing processing requirements and eliminating the chances of false
positives. Likewise, administrators can define a list of bad email senders for blocking. In some
cases, administrators may choose to utilize the IP block lists to restrict specific mail servers as a
matter of policy rather than as a matter of spam protection.
Barracuda Spam & Virus Firewall Concepts 19
In general, external blacklists take precedence over subsequent allow lists (“s”) on the sender email
address or domain, recipient, subject headers or message body.
Sender Authentication
Declaring an invalid “from” address is a common practice by spammers. The Barracuda Spam &
Virus Firewall Sender Authentication layer utilizes a number of techniques to both validate the sender
and apply policy, including domain name spoof protection, performing a DNS lookup of domain
names and enforcing RFC 821 compliance.
Sender Policy Framework (SPF) tracks sender authentication by having domains publish reverse
MX records to display which machines are designated as mail sending machines for that domain. The
recipient can check those records to make sure mail is coming from a designated sending machine.
DomainKeys (DKIM) dictates that a sending domain cryptographically signs outgoing messages,
allowing the sending domain to assert responsibility for a message. When receiving a message from
a domain, the recipient can check the signature of the message to verify that the message is, indeed,
from the sending domain and that the message has not been tampered with.
See the Advanced Configuration, page 61 chapter for details on configuring this layer.
Recipient Verification
The Barracuda Spam & Virus Firewall verifies the validity of recipient email addresses through
multiple techniques to prevent invalid bounce messages. See the Advanced Configuration, page 61
chapter to learn about LDAP integration, SMTP recipient verification and using a local database for
recipient verification.
20
Barracuda Spam & Virus Firewall Administrator’s Guide
Mail Scanning Layers
Virus Scanning
The most basic level of Mail Scanning is virus scanning. The Barracuda Spam & Virus Firewall
utilizes three layers of virus scanning and automatically decompresses archives for comprehensive
protection. By utilizing virus definitions, Barracuda Spam & Virus Firewall customers receive the
best and most comprehensive virus and malware protection available. The three layers of virus
scanning include:
• Powerful open source virus definitions from the open source community help monitor and block the
latest virus threats.
• Proprietary virus definitions, gathered and maintained by Barracuda Central, our advanced 24/7
security operations center that works to continuously monitor and block the latest Internet threats.
• Barracuda Real-Time Protection. With this feature enabled, any new virus or spam outbreak can be
stopped in real-time for industry-leading response times to email-borne threats. Barracuda Real-Time
Protection allows customers the ability to report virus and spam propagation activity at an early stage
to Barracuda Central.
Virus Scanning takes precedence over all other Mail Scanning techniques and is applied even when
mail passes through the Connection Management layers. As such, even email coming from “ed” IP
addresses, sender domains, sender email addresses or recipients are still scanned for viruses and
blocked if a virus is detected.
User-specified rules (custom policy)
Administrators can choose to define their own policies, perhaps for compliance or governance
reasons, which take precedence over spam blocking rules delivered to the system automatically
through Barracuda Energize Updates. Administrators can set custom content filters based on the
subject, message headers, message bodies and attachment file type.
Fingerprint Analysis
A message “fingerprint” is based on commonly used message components (e.g., an image) across
many instances of spam. Fingerprint analysis is often a useful mechanism for blocking future
instances of spam once an early outbreak is identified. Engineers at Barracuda Central work around
the clock to identify new spam fingerprints which are then updated on all Barracuda Spam & Virus
Firewalls through hourly Barracuda Energize Updates.
Intent Analysis
All spam messages have an “intent” – to get a user to reply to an email, visit a Web site or call a phone
number. Intent analysis involves researching email addresses, Web links and phone numbers
embedded in email messages to determine whether they are associated with legitimate entities.
Frequently, Intent Analysis is the defense layer that catches phishing attacks. The Barracuda Spam &
Barracuda Spam & Virus Firewall Concepts 21
Virus Firewall features various forms of Intent Analysis, including real-time and multi-level intent
analysis.
Image Analysis
While Fingerprint Analysis captures a significant percentage of images after they have been seen, the
Barracuda Spam & Virus Firewall also uses Image Analysis techniques which protect against new
image variants. These techniques include:
•
•
•
Optical character recognition (OCR)- Enables the Barracuda Spam & Virus Firewall to
analyze the text rendered inside embedded images.
Image processing - To mitigate attempts by spammers to foil OCR through speckling, shading
or color manipulation, the Barracuda Spam & Virus Firewall also utilizes a number of
lightweight image processing technologies to normalize the images prior to the OCR phase.
More heavyweight image processing algorithms are utilized at Barracuda Central to quickly
generate fingerprints that can be used by the Barracuda Spam & Virus Firewall to block
messages.
Animated GIF analysis - The Barracuda Spam & Virus Firewall contains specialized
algorithms for analyzing animated GIFs for suspect content.
Bayesian Analysis
Bayesian Analysis is a linguistic algorithm that profiles language used in both spam messages and
legitimate email for any particular user or organization. To determine the likelihood that a new email
is spam, Bayesian Analysis compares the words and phrases used in the new email against the corpus
of previously identified email. The Barracuda Spam & Virus Firewall only uses Bayesian Analysis
after administrators or users profile a corpus of at least 200 legitimate (not spam) messages and 200
spam messages.
Spam Scoring
Once a message has passed the initial Barracuda Spam & Virus Firewall block/accept filters, it
receives a score for its spam probability. This score ranges from 0 (definitely not spam) to 9 or greater
(definitely spam). Based on this score, the Barracuda Spam & Virus Firewall can take one of four
actions:
•
•
•
•
Block
Quarantine
Tag
Allow
Note: The Barracuda Spam & Virus Firewall 400 and higher allows setting spam score levels at the
domain level.From the DOMAINS page, click on a domain to manage (if you have configured multiple
domains to be managed by your Barracuda Spam & Virus Firewall). Set spam scoring levels on the
BASIC > Spam Checking page.
22
Barracuda Spam & Virus Firewall Administrator’s Guide
Predictive Sender Profiling
When spammers try to hide their identities, the Barracuda Spam & Virus Firewall can use Predictive
Sender Profiling to identify behaviors of all senders and apply the applicable Barracuda Spam &
Virus Firewall defense tactic to reject connections and/or messages from spammers. This involves
looking beyond the reputation of the apparent sender of a message, just like a bank needs to look
beyond the reputation of a valid credit card holder of a card that is lost or stolen and used for fraud.
Some examples of spammer behavior that attempts to hide behind a valid domain, and the Barracuda
Spam & Virus Firewall features that address them, include the following:
•
Sending too many emails from a single network address
Automated spam software can be used to send large amounts of email from a single mail server.
The Rate Control feature on the Barracuda Spam & Virus Firewall can be set to limit the
number of connections made from any IP address within a 30 minute time period. Violations are
logged to identify spammers. Rate Control is configured from the BLOCK/ACCEPT > Rate
Control page.
The Messages Per SMTP Session setting limits the number of messages allowed in one SMTP
session. If the number of messages in one session exceeds this threshold, the rest of the
messages are temporarily blocked and are displayed in the message log as being "Deferred" with
"Per-Connection Message Limit Exceeded" as the reason for the postponement. The sender is
required to make a new connection to continue sending messages, which may ultimately trigger
a Rate Control deferral. For this and other SMTP security settings, see the ADVANCED > Email
Protocol page.
•
Attempting to send to too many invalid recipients
Many spammers attack email infrastructures by harvesting email addresses. Recipient
Verification on the Barracuda Spam & Virus Firewall enables the system to automatically reject
SMTP connection attempts from email senders that attempt to send to too many invalid
recipients, a behavior indicative of directory harvest or dictionary attacks.
Using LDAP lookup or a local database to verify valid recipients as well as Sender Spoof
Protection, which blocks email with "From" addresses which use an allowed recipient domain
on the Barracuda Spam & Virus Firewall, protects against receiving mail targeted to invalid
recipients.
•
Registering new domains for spam campaigns
Because registering new domain names is fast and inexpensive, many spammers switch domain
names used in a campaign and send blast emails on the first day of domain registration. Realtime Intent Analysis on the Barracuda Spam & Virus Firewall is typically used for new domain
names and involves performing DNS lookups and comparing DNS configuration of new
domains against the DNS configurations of known spammer domains.
•
Using free Internet services to redirect to known spam domains
Use of free Web sites to redirect to known spammer Web sites is a growing practice used by
spammers to hide or obfuscate their identity from mail scanning techniques such as Intent
Analysis. With Multilevel Intent Analysis, the Barracuda Spam & Virus Firewall inspects the
results of Web queries to URIs of well-known free Web sites for redirections to known spammer
sites.
Barracuda Spam & Virus Firewall Concepts 23
24
Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 3
Getting Started
This chapter will guide you in installing the Barracuda Spam & Virus Firewall and beginning to scan
and monitor email traffic.
Initial Setup ....................................................................................... 26
Initial Configuration of the System.................................................... 32
Route Incoming Email to the Barracuda Spam & Virus Firewall..... 35
Administrative Settings and the Web Interface .................................. 37
Tune and Monitor the Default Spam and Virus Settings ................... 40
Viewing Performance Statistics ......................................................... 42
Setting up Quarantine........................................................................ 43
Getting Started 25
Initial Setup
Checklist for Unpacking
Before installing your Barracuda Spam & Virus Firewall, match the items on this list with the items
in the box.
If any item is missing or damaged, please contact your Barracuda Networks Sales representative.
•
•
•
Barracuda Spam & Virus Firewall (check that you have received the correct model)
AC power cord
Mounting rails (Barracuda Spam & Virus Firewall 600, 800, and 900 only)
Also required for installation:
•
•
•
VGA monitor
PS2 keyboard
Ethernet cables
Installation Examples
This section provides example installation scenarios you can reference to help determine the best way
to integrate the Barracuda Spam & Virus Firewall into your network environment.
Barracuda Spam & Virus Firewall Behind Corporate Firewall
The figure below shows the Barracuda Spam & Virus Firewall behind your corporate firewall. In this
example, the Mail Server has an IP address of 10.10.10.2 and the Barracuda Spam & Virus Firewall
has an IP address of 10.10.10.3.
26
Barracuda Spam & Virus Firewall Administrator’s Guide
Figure 3.1: The Barracuda Spam & Virus Firewall behind the corporate firewall
In this type of setup, perform the following tasks:
•
•
Forward (port redirection) incoming SMTP traffic on port 25 to the Barracuda Spam & Virus
Firewall at 10.10.10.3.
Configure the Barracuda Spam & Virus Firewall to forward filtered messages to the destination
mail server at 10.10.10.2.
There is no need to modify any MX records for this type of setup.
Barracuda Spam & Virus Firewall in the DMZ
The figure below shows the Barracuda Spam & Virus Firewall in front of your corporate firewall in
the DMZ. In this example, the Mail Server has an IP address of 65.5.5.6 and the Barracuda Spam &
Virus Firewall has an internal IP address of 64.5.5.5.
Getting Started 27
Figure 3.2: The Barracuda Spam & Virus Firewall in the DMZ
In this type of setup, perform the following tasks:
•
•
Assign an available external IP address to the Barracuda Spam & Virus Firewall.
Change the MX (Mail Exchange) records on the DNS (Domain Name Server) to direct traffic to
the Barracuda Spam & Virus Firewall. Create an A record and MX record on your DNS for the
Barracuda.
The following example shows a DNS entry for a Barracuda Spam & Virus Firewall with a name
of barracuda and an IP address of 64.5.5.5.
barracuda.yourdomain.com
IN
A
64.5.5.5
The following example shows the associated MX record with a priority number of 10:
IN MX 10 barracuda.yourdomain.com
Clustering the Barracuda Spam & Virus Firewall
Clustering two or more Barracuda Spam & Virus Firewalls makes sense if your organization requires
high availability, scalability, data redundancy and/or fault tolerance. Clustering also provides
centralized management of policy because once you configure one of the devices, configuration
settings are synchronized across the cluster almost immediately. Clustered systems can be
geographically dispersed and do not need to be located on the same network.
For more information about setting up a cluster of Barracuda Spam & Virus Firewalls, see Clustering
the Barracuda Spam & Virus Firewall, page 67.
28
Barracuda Spam & Virus Firewall Administrator’s Guide
Install the Barracuda Spam & Virus Firewall
To physically install the Barracuda Spam & Virus Firewall:
1.
Fasten the Barracuda Spam & Virus Firewall to a standard 19-inch rack or other stable location.
Warning
Do not block the cooling vents located on the front and rear of the unit.
2.
Connect a CAT5 Ethernet cable from your network switch to the Ethernet port on the back of
your Barracuda Spam & Virus Firewall.
The Barracuda Spam & Virus Firewall supports both 10BaseT and 100BaseT Ethernet.
Barracuda Networks recommends using a 100BaseT connection for best performance.
Note
The Barracuda Spam & Virus Firewall 600 and higher supports Gigabit Ethernet and has two
usable LAN ports. On these models, plug the Ethernet cable into the LAN 2 port.
Do not connect any other cables to the other connectors on the unit. These connectors are for
diagnostic purposes.
3.
Connect the following to your Barracuda Spam & Virus Firewall:
• Power cord
• VGA monitor
• PS2 keyboard
After you connect the AC power cord the Barracuda Spam & Virus Firewall may power on for a
few seconds and then power off. This is standard behavior.
4.
Press the Power button located on the front of the unit
The login prompt for the administrative console is displayed on the monitor, and the light on the
front of the system turns on. For a description of each indicator light, refer to Front Panel
Indicator Lights on page 105.
APC UPS Support
An APC (American Power Conversion) UPS (Uninterruptible Power Supply) device with a USB
interface is supported with the Barracuda Spam & Virus Firewall. No configuration changes are
needed on the Barracuda Spam & Virus Firewall to use one. When the APC UPS device is on battery
power, the Web interface will display an alert, and the Barracuda Spam & Virus Firewall will shut
down safely when there is an estimated time of 3 minutes of battery power remaining.
Getting Started 29
Configure IP Address and Network Settings
The Barracuda Spam & Virus Firewall is given a default IP address of 192.168.200.200. You can
change this address by doing either of the following:
•
•
Connect directly to the Barracuda Spam & Virus Firewall and specify a new IP address through
the console interface.
Applies only to the Barracuda Spam & Virus Firewall 200, 300, 400, and 600: Push and hold the
Reset button on the front panel. Holding the Reset button for 5 seconds changes the IP address
to 192.168.200.200. Holding the Reset button for 8 seconds changes the IP address to
192.168.1.200. Holding the Reset button for 12 seconds changes the IP address to 10.1.1.200.
To connect directly to the Barracuda Spam & Virus Firewall to set a new IP address:
1.
At the barracuda login prompt enter admin for the login and admin for the password.
The User Confirmation Requested window will display the current IP configuration of the
system.
Figure 3.3: Configuring the IP address of the Barracuda Spam & Virus Firewall
2.
Using the Tab key, select Yes to change the IP configuration.
3.
Enter the new IP address, netmask, and default gateway for your Barracuda Spam & Virus
Firewall, and select OK when finished.
4.
Select No when prompted if you want to change the IP configuration. Upon exiting the screen,
the new IP address and network settings will be applied to the Barracuda Spam & Virus
Firewall.
Configure your Corporate Firewall
If your Barracuda Spam & Virus Firewall is located behind a corporate firewall, you need to open
specific ports to allow communication between the Barracuda Spam & Virus Firewall and remote
servers.
30
Barracuda Spam & Virus Firewall Administrator’s Guide
To configure your corporate firewall:
1.
Using the following table as a reference. Open the specified ports on your corporate firewall:
Table 3.1:
Port
Direction
Protocol
Used for...
22
Out
TCP
Remote diagnostics and technical
support services (recommended)
25
In/Out
TCP
SMTP
53
Out
TCP/UDP
Domain Name Server (DNS)
80
Out
TCP
Virus, firmware, security and spam
rule definitions
123
Out
UDP
NTP (Network Time Protocol)
2.
If appropriate, change the NAT routing of your corporate firewall to route incoming email to the
Barracuda Spam & Virus Firewall. Consult your firewall documentation or your corporate
firewall administrator to make the necessary changes.
Getting Started 31
Initial Configuration of the System
After specifying the IP address of the system and opening the necessary ports on your firewall, you
need to configure the Barracuda Spam & Virus Firewall from the Web interface. Make sure the
computer from which you configure the Barracuda Spam & Virus Firewall is connected to the same
network, and the appropriate routing is in place to allow connection to the Barracuda Spam & Virus
Firewall’s IP address from a Web browser.
To configure the Barracuda Spam & Virus Firewall:
1.
From a Web browser, enter the IP address of the Barracuda Spam & Virus Firewall followed by
port 8000.
Example: http://192.168.200.200:8000
2.
Log in to the Web interface by entering admin for the username and admin for the password.
3.
On the BASIC > IP Configuration page, enter the required information in the fields as described
in the following table:
Table 3.2:
Fields
Description
TCP/IP Configuration
The IP address, subnet mask, and default gateway of your
Barracuda Spam & Virus Firewall. The TCP port is the port on
which the Barracuda Spam & Virus Firewall receives incoming
email. This is usually port 25.
Destination Mail Server TCP/IP
Configuration
The hostname or IP address of your destination mail server; for
example mail.yourdomain.com. This is the mail server that
receives email after it has been checked for spam and viruses.
You should specify your mail server’s hostname rather than its IP
address so the destination mail server can be moved and DNS
updated at any time without any changes needed to the
Barracuda Spam & Virus Firewall.
TCP port is the port on which the destination mail server receives
all SMTP traffic such as inbound email. This is usually port 25.
If you need to set up more than one domain or mail server, refer
to Creating and Managing Domains, page 95.
DNS Configuration
The primary and secondary DNS servers you use on your
network.
It is strongly recommended that you specify a primary and
secondary DNS server. Certain features of the Barracuda Spam &
Virus Firewall, such as a Fake Sender Domain detection, rely on
DNS availability.
Domain Configuration
Default Hostname is the hostname to be used in the reply address
for email messages (non-delivery receipts, virus alert
notifications, etc.) sent from the Barracuda Spam & Virus Firewall.
The hostname is appended to the default domain.
Default Domain is a required field and indicates the domain name
to be used in the reply address for email messages (non-delivery
receipts, virus alert notifications, etc.) sent from the Barracuda
Spam & Virus Firewall.
32
Barracuda Spam & Virus Firewall Administrator’s Guide
Table 3.2:
Fields
Description
Accepted Email Recipients
Domains
The domains managed by the Barracuda Spam & Virus Firewall.
Make sure this list is complete. The Barracuda Spam & Virus
Firewall rejects all incoming messages addressed to domains not
in this list.
To allow messages for all domains that match your mail server,
put an asterisk (*) in this field, however, this is not a
recommended configuration.
Note: One Barracuda Spam & Virus Firewall can support multiple
domains and mail servers. If you have multiple mail servers, go to
the DOMAINS tab and enter the mail server associated with each
domain.
4.
Click Save Changes.
If you changed the IP address of your Barracuda Spam & Virus Firewall, you are disconnected
from the Web interface and will need to log in again using the new IP address.
Activate Your Subscriptions
After installation, your Energize Updates and other optional subscriptions must be activated for the
Barracuda Spam & Virus Firewall to be fully enabled, and continue to receive the latest updates to all
virus, policy, and spam definitions from Barracuda Central. The Energize Updates service is
responsible for downloading these updates to your Barracuda Spam & Virus Firewall.
5.
At the top of every page, you may see the following warning
Product Activation
6.
Click on the designated link to open up the Product Activation page in a new browser window.
7.
On the Product Activation page, fill in the required fields and click Activate. A confirmation
page opens to display the terms of your subscription.
8.
Return to the Barracuda Spam & Virus Firewall Web interface and navigate to the BASIC >
Status page. In the Subscription Status section, verify that the word Current appears next to
Energize Updates, Instant Replacement Service (if purchased) and Premium Support (if
purchased).
9.
There may be a slight delay of a few minutes for the display to reflect your updated subscription
status. If the status is still showing as unactivated, click Refresh in the Subscription Status
section.
Note
If your subscription status does not change to within an hour, or if you have trouble filling out the
Product Activation page, call your Barracuda Networks sales representative.
Getting Started 33
Update the Barracuda Spam & Virus Firewall Firmware
Prior to upgrading the firmware on your Barracuda Spam & Virus Firewall, it is always recommended
that you read the release notes.
To upgrade the firmware on the Barracuda Spam & Virus Firewall:
1.
Note
Go to the ADVANCED > Firmware Update page. Verify that the installed version matches the
Latest General Release. The Download Now button next to the Latest General Release is
disabled if the Barracuda Spam & Virus Firewall is already up-to-date with the latest firmware.
ALWAYS read the release notes prior to downloading a new firmware version. Release notes
provide you with information on the latest features and fixes provided in the updated firmware
version. You can access the release notes from the Advanced > Firmware Update.
2.
If the installed version does not match the Latest General Release: read the release notes to
learn about the latest features and fixes provided in the new firmware version, and click
Download Now to begin the download. Updating the firmware may take several minutes. Do not
turn off the unit during this process.
You can view the download status by clicking the Refresh button next to the firmware download
progress. A “Firmware downloaded” message displays once the download is complete, and the
Refresh button will turn into Apply Now.
Note
The “apply” process takes several minutes to complete. It is important to not power-cycle the unit
during the download. Inbound and outbound traffic for mail resumes automatically when the update
process is complete.
3.
Click Apply Now to activate the newly-downloaded firmware. This process will automatically
reboot your system when completed, which can cause your Web interface to disconnect
momentarily. This is normal and expected behavior, so there is no need to perform a manual
reboot. A Status page displays the progress of the reboot. Once the reboot is complete, the login
page will reappear.
Update Definitions
To apply the newest definitions provided by Energize Updates:
34
1.
Select ADVANCED > Energize Updates.
2.
Select On for Automatically Update. The recommended setting is On for all available
definitions.
3.
Check to see if the current version is the same as the latest general release. If the rules are up-todate, proceed to the next section. If the rules are not up-to-date, continue to the next step.
4.
Click Update to download and install the latest available definitions onto the Barracuda Spam &
Virus Firewall.
Barracuda Spam & Virus Firewall Administrator’s Guide
Routing Email
Route Incoming Email to the Barracuda Spam & Virus Firewall
The next step in setting up your Barracuda Spam & Virus Firewall is to route incoming email to the
system so it can scan incoming messages for spam and viruses. You can use either of the following
methods to route messages to your Barracuda Spam & Virus Firewall:
•
•
Use Port forwarding to redirect incoming SMTP traffic (port 25) to the Barracuda Spam &
Virus Firewall if it is installed behind a corporate firewall running NAT (Network Address
Translation). Configure this option on the ADVANCED > Advanced Networking page. For more
information about port forwarding, refer to your firewall documentation or network
administrator.
MX records are used when your Barracuda Spam & Virus Firewall is located in a DMZ with a
routable public IP address. If your Barracuda Spam & Virus Firewall is in the DMZ (not
protected by your corporate firewall), do the following to route incoming messages to the
system:
1. Create a DNS entry for your Barracuda Spam & Virus Firewall.
The following example shows a DNS entry for a Barracuda Spam & Virus Firewall
with a name of barracuda and an IP address of 66.233.233.88:
barracuda.yourdomain.com
IN
A
66.233.233.88
2. Change your DNS MX Records.
The following example shows the associated MX record with a priority number of 10:
IN MX 10 barracuda.yourdomain.com
You can configure specific SMTP settings from the ADVANCED > Email Protocol page. After you
route incoming email to the Barracuda Spam & Virus Firewall, it will begin filtering all email it
receives and routing good email to your mail server.
Configuring Basic Scanning of Outgoing Mail
The Barracuda Spam & Virus Firewall may be configured to relay outgoing email simultaneously
with scanning inbound mail. Outgoing email is scanned, but not as thoroughly as incoming email. The
following checks are performed on outgoing email:
•
•
•
•
•
•
Rate control
Allowed and blocked recipients (global settings)
Allowed and blocked senders (global settings)
Subject, header and body filtering
Virus scanning
Fingerprinting
To relay outgoing mail through the Barracuda Spam & Virus Firewall, you must configure the
outbound relay operation on the ADVANCED > Outbound page. There you’ll enable outbound relay,
specify the outbound SMTP or smart host if you have one, the trusted mail server IP address or
domain name (either your mail server or another trusted relay) and, optionally, an authentication type.
The Barracuda Spam & Virus Firewall supports SMTP/SASL authentication and LDAP.
Getting Started 35
If you are relaying though a smart host, you must also configure the smart host to send to the Internet.
Be aware that configuring the Barracuda Spam & Virus Firewall to scan outbound as well as inbound
email will increase the load on the system. You may find that you need to upgrade your Barracuda
Spam & Virus Firewall to another model.
Outbound Message Footer
The Barracuda Spam & Virus Firewall can append a custom text and/or html footer to each outbound
message, configurable on the ADVANCED > Outbound Footers page. You can also opt to exclude
certain email senders from having the outbound footer appended to their outgoing messages.
36
Barracuda Spam & Virus Firewall Administrator’s Guide
Administrative Settings and the Web Interface
Global Versus Domain Level Administration
The Barracuda Spam & Virus Firewall 400 and higher provides for global-level settings for most
features as well as domain-level, or “per-domain” settings, some of which can optionally override
global settings.The Web interface enables “drilling down” from the global scope, as shown in
Figure 3.4, to the domain scope. The domain scope provides for reporting and configuring
quarantine, spam scoring and user authentication settings on a per-domain basis.
Figure 3.4: Drilling down to domain scope from global scope
Per-domain settings are useful in cases where different domains protected by the Barracuda Spam &
Virus Firewall belong to different organizations with different email security requirements or users
with different levels of knowledge or permissions.
For example, a medical organization may want to domains that send pharmaceutical related
messages, while another organization would consider such email to be spam. Some organizations will
want to configure per-user quarantine, giving their users control of their own whitelist/blacklist
settings and spam scoring, while others may not want their users to have to manage a separate mailbox
for quarantined messages. Per-domain settings are administered in the “domain scope” level of the
Web interface, accessible from the DOMAINS tab as shown above in Figure 3.4 by clicking the
Manage Domain link..
User accounts under each domain can be configured with custom whitelist/blacklist, spam scoring
and quarantine inbox settings. Thus, user accounts can be managed either from the global level
USERS > Account view page or at the domain level from the DOMAINS > Manage Domain > USERS
> Account view page. Breadcrumbs in the upper right section of the page always indicate the name of
the logged in account and the path through which the user navigated to the current page. See Rolebased Administration, page 87 for more information and illustrations of scope and Web interface
navigation.
Controlling Access to the Web Interface
The BASIC > Administration page allows you to perform the following tasks for initial setup:
Getting Started 37
•
•
•
•
•
•
Required: Fill in the System Contact, Alerts and SNMP email notifications email addresses in
the Email Notification section of the page so the Barracuda Spam & Virus Firewall can send
out important alerts if needed.
Change the password of the administration account.
Change the HTTP port used to access the Web interface.
Change the length of time users can be logged into the Web interface (Session Expiration
Length - default is 60 minutes).
Specify the IP addresses or netmask of the systems that can access the Web interface. All other
systems will be denied access. This is configurable in the Administrator IP/Range section.
Specify the IP addresses or netmask of the systems that can communicate with the Barracuda
Spam & Virus Firewall via SNMP.
Customizing the Appearance of the Web interface
The ADVANCED > Appearance page allows you to customize the default images used on the Web
interface. This tab is only displayed on the Barracuda Spam & Virus Firewall 600 and higher.
Changing the Language of the Web Interface
You can change the language of the Web interface by selecting a language from the drop-down menu
in the upper right corner of the page near the Log Off link and the breadcrumbs. Supported languages
include Chinese, Japanese, Spanish, French, and others. The language you select is only applied to
your individual Web interface. No other user’s Web interface is affected.
Setting the Time Zone of the System
You can set the time zone of your Barracuda Spam & Virus Firewall from the BASIC > Administration
page. The current time on the system is automatically updated via Network Time Protocol (NTP).
When the Barracuda Spam & Virus Firewall resides behind a firewall, NTP requires port 123 to be
opened for outbound UDP traffic. You can specify the NTP server to use on the ADVANCED >
Advanced Networking page.
It is important that the time zone is set correctly because this information is used in all logs and
reports.
Note: The Barracuda Spam & Virus Firewall automatically reboots when you change the timezone.
Note
It is important that the time zone be set correctly because this information is used to determine the
delivery times for messages and may appear in certain mail reading programs.
Enabling SSL for Administrators and Users
SSL (Secure Socket Layer) ensures that your passwords are encrypted and that all data transmitted to
and received from the Web interface is encrypted as well. All Barracuda Spam & Virus Firewalls
38
Barracuda Spam & Virus Firewall Administrator’s Guide
support SSL access without any additional configuration. However, some sites may wish to enforce
using a secured connection to access the Web interface, or prefer to use their own trusted certificates.
For more information about securing your Barracuda Spam & Virus Firewall, see Securing the
Barracuda Spam & Virus Firewall, page 45.
Note
The SSL configuration referred to here is related only to the Web interface. There is no need to
explicitly configure SSL for traffic between the Barracuda Spam & Virus Firewall and your mail
servers.
To enforce SSL-only access:
1.
On the ADVANCED > Secure Administration page, select Yes to enable HTTPS/SSL access
only to the Web interface. Setting this to No will still allow the Barracuda Spam & Virus
Firewall to accept non-SSL connections.
2.
Select Yes to Use HTTPS links in emails for per-user quarantine messages sent from the
Barracuda Spam & Virus Firewall.
3.
Enter your desired Web Interface HTTPS/SSL port for the Web interface. The default is 443.
4.
Click Save Changes.
If you wish to change the certificate that is used, you must first create and upload it to the Barracuda
Spam & Virus Firewall before changing the Certificate Type in the SSL Certificate Configuration
section of the ADVANCED > Secure Administration page. See the online help for instructions. The
Barracuda Spam & Virus Firewall supports the following types of certificates:
•
•
•
Default (Barracuda Networks) certificates are signed by Barracuda Networks. On some
browsers, these may generate some benign warnings which can be safely ignored. No additional
configuration is required to use these certificates, and are provided free of charge as the default
type of certificate.
Private (self-signed) certificates provide strong encryption without the cost of purchasing a
certificate from a trusted Certificate Authority (CA). These certificates are created by providing
the information requested in the Private (self-signed) section of the page. You may also want to
download the Private Root Certificate and import it into your browser, to allow it to verify the
authenticity of the certificate and prevent any warnings that may come up when accessing the
Web interface.
Trusted (signed by a trusted CA) certificates are issued by trusted Certificate Authorities
(CA), and must be purchased from them separately with a Certificate Signing Request (CSR).
This can be downloaded after providing the information requested in the Trusted (Signed by a
trusted CA) section of the page. Once you have received the certificate and key from the CA,
you must upload both items to the Barracuda Spam & Virus Firewall from this section of the
page. The certificate will be in effect as soon as the upload is complete.
Getting Started 39
Tune and Monitor the Default Spam and Virus Settings
After you install the Barracuda Spam & Virus Firewall, the system begins filtering incoming email
based on the default settings. For example, the system automatically checks incoming email for
viruses and uses the Barracuda Blacklist service to identify spam.
Initial spam scoring limits for your Barracuda Spam & Virus Firewall are shown on the BASIC >
Spam Scoring page and are described in Table 3.3. Once you have more experience with the
Barracuda Spam & Virus Firewall you can adjust how aggressively the system deals with spam. For
example, you may decide to tag or quarantine spam instead of blocking it.
Spam Scoring - Block, Tag and Quarantine
As a message passes through the last of the twelve defense layers, it is scored for spam probability.
This score ranges from 0 (definitely not spam) to 10 or higher (definitely spam). Based on this score,
the Barracuda Spam & Virus Firewall either tags, quarantines, blocks or allows the message.The
following table describes the spam scoring settings on the BASIC > Spam Scoring page. A score
setting of 10 for any action disables that action.
Note
On the Barracuda Spam & Virus Firewall 400 or higher you can set the spam scoring values on a
per-domain basis; on the Barracuda Spam & Virus Firewall 600 and higher, on a per-user basis,
from the DOMAINS tab. For more information about per-domain and per-user settings, refer to
Chapter 8, Managing Accounts and Domains, p. 83.
Table 3.3:
Setting
Description
Tag score
Messages with a score at or above this threshold, but below the
quarantine threshold, are delivered to the sender with the word
[BULK] (default) added to the subject line.
You can change the default text added to the subject line by entering
new text in the Spam Tag Configuration section of the page.
Any message with a score below the tag threshold is automatically
allowed. The default value is 3.5.
Quarantine score
Messages with a score above this threshold, but below the block
threshold, are forwarded to the quarantine mailbox you specify. For
information on specifying the quarantine mailbox, refer to Chapter 7,
Managing Quarantine, p. 73.
The default setting is 10 (quarantine disabled). To enable quarantine,
this setting must have a value lower than the block threshold.
Block score
40
Messages with a score above this threshold are not delivered to the
recipient. By default, the Barracuda Spam & Virus Firewall does NOT
send an NDR (non-delivery receipt) bounce message to the sender,
but this feature can be enabled in the Spam Bounce (NDR)
Configuration section of the ADVANCED > Bounce/NDR Settings
page. The default block score value is 7.
Barracuda Spam & Virus Firewall Administrator’s Guide
Monitor and Classify Incoming Emails
Once email is flowing through the Barracuda Spam & Virus Firewall, the administrator can view the
BASIC > Message Log page to get an idea of how many messages are being blocked, quarantined,
tagged or allowed, with reasons for each of those actions. Reviewing this log will give an idea of how
current settings are filtering messages, and the page enables adding or removing message senders to
or from the .
If you enable Bayesian filtering on the BASIC > Spam Checking page, you will then see Spam and
Not Spam buttons on the Message Log page. Use these to train the Bayesian database. With Bayesian
filtering enabled, if a message is not classified as spam by the Barracuda Spam & Virus Firewall, but
it appears to be spam, you can elect to submit that message to Barracuda Central from the Message
Log page. Note that Bayesian filtering is turned off by default.
See Chapter 5, Advanced Spam Filtering Policy, p. 51 for more details on using the Message Log with
Bayesian filtering, creating custom whitelists and blacklists to allow or block messages from specific
IP addresses, domains or email accounts.
Virus Checking and Notifications
Virus scanning is automatically enabled on the Barracuda Spam & Virus Firewall and the system
checks for definition updates on a regular basis (hourly by default). Virus Scanning takes precedence
over all other mail scanning techniques and is applied even when mail passes through the Connection
Management layers. As such, even email coming from “ed” IP addresses, sender domains, sender
email addresses or recipients are scanned for viruses and blocked if a virus is detected.
Use the BASIC > Virus Checking page to configure virus checking. If you enable Barracuda RealTime Protection, the Barracuda Spam & Virus Firewall will check unrecognized spam and virus
fingerprints against the latest virus threats logged at Barracuda Central that have not yet been
downloaded by the Barracuda Spam & Virus Firewall Energize Updates. See the online help on the
BASIC > Virus Checking page for more details about this setting.
Attachment Block Notifications
You can enable or disable notification emails to senders and intended receivers of banned file
attachments from the ADVANCED > Bounce/NDR Settings page. From this page you can also enter
custom message text to insert in the notifications. Attachments will be filtered based on settings on
the BLOCK/ACCEPT > Attachment Filters page.
Getting Started 41
Viewing Performance Statistics
The BASIC > Status provides an overview of the health and performance of your Barracuda Spam &
Virus Firewall, including:
•
•
•
42
Hourly and daily email statistics that display the number of messages blocked, quarantined, and
allowed for the last 24 hours and 25 days.
The subscription status of Energize Updates.
Performance statistics, including CPU temperature and system load. Performance statistics
displayed in red signify that the value exceeds the normal threshold. These values will fluctuate
based on the amount of traffic that is being handled, but if any setting remains consistently in the
red for a long period of time, please contact Contacting Technical Support, page 16.
Barracuda Spam & Virus Firewall Administrator’s Guide
Setting up Quarantine
By default, the Barracuda Spam & Virus Firewall does not quarantine incoming messages, but you
may want to enable quarantine because it offloads storage of potential spam from the mail server and
backups. It also keeps potential spam messages out of the user’s inbox. Some organizations require
quarantine behavior; however, tagging messages that might be spam is recommended over
quarantining them for several reasons:
•
•
With tagging, the user doesn’t need an additional inbox for storing quarantined messages
because the potential spam message is delivered to their regular inbox with a special word or
phrase prepended to the Subject line to indicate that it has been tagged as potential spam. These
messages can be filtered to a special mailbox if the user desires, or can be viewed or deleted
from their regular inbox.
Tagging messages on the Barracuda Spam & Virus Firewall saves system resources because the
message is not stored on the appliance itself; it’s sent on to the user’s mailbox or to an
administrator’s mailbox to manage.
Note that, by enabling quarantine of incoming messages identified as possible spam, either the user
or the administrator is required to maintain the quarantine inbox and settings.
Quarantine can be enabled or disabled in the Spam Scoring Limits section on the BASIC > Spam
Scoring page. If enabled, you can select either Global quarantine or Per-User quarantine. For more
information, refer to Chapter 7, Managing Quarantine, p. 73.
Getting Started 43
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Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 4
Securing the Barracuda Spam & Virus Firewall
This chapter covers various optional features to secure your Barracuda Spam & Virus Firewall with
respect to deployment on your network, user access and inbound and outbound email. The following
topics are covered:
Securing Network Access................................................................... 46
Limiting User Access ......................................................................... 48
Advanced Email Security Policy........................................................ 49
Securing the Barracuda Spam & Virus Firewall 45
Securing Network Access
To secure your Barracuda Spam & Virus Firewall on your network, begin by locking down the user
interface ports. Barracuda Networks recommends using the non-standard port 8000 for internal access
to the Web interface, which is configured on the BASIC > Administration page. From that page you
can also further limit access to the Web interface by IP address with the Administrator/IP Range
setting. If no IP address is specified in this field, then all systems are granted access with the correct
administrator password.
You can secure external access to the Barracuda Spam & Virus Firewall with the Web Interface
HTTPS/SSL Port setting on the ADVANCED > Secure Administration page. The recommended port
is 443 because it is a standard HTTPS/SSL port that is used for secure Web browser communication,
and the identity of the remotely connected server can be verified with significant confidence.
Note
If per-user quarantine is enabled as well as HTTPS, users will be redirected to HTTP access if they
are trying to access their quarantine inbox.
SSL Certificates
Limiting user interface access to HTTPS provides further security and can also be configured on the
ADVANCED > Secure Administration page along with the use of SSL certificates. There are three
types of SSL certificates to choose from: Default (Barracuda Networks), Private (self-signed) or
Trusted certificate - a certificate signed by a trusted certificate authority (CA). Configuring SSL
certificates is described in this guide in the Enabling SSL for Administrators and Users, page 38
section of the Getting Started, page 25 chapter as well as in the online help of the ADVANCED >
Secure Administration page
Secure Links in Notification Emails
If Per-User quarantine (as opposed to Global) is configured on the BASIC > Quarantine page, you
might want to secure hyperlinks in quarantine correspondence emails that are sent from the Barracuda
Spam & Virus Firewall to users and administrators. Setting Use HTTPS Links in Emails to Yes on
the ADVANCED > Secure Administration page ensures that these emails sent from the Barracuda
Spam & Virus Firewall contain only HTTPS links.
Limiting Access to the API
The Barracuda set of APIs provides for remote administration and configuration of the Barracuda
Spam & Virus Firewall. More detailed information regarding the API can be found in the Barracuda
Spam & Virus Firewall API Guide located at http://www.barracuda.com/documentation. Common
things, such as IP addresses and spam scoring levels, that you can set by clicking the “Save Changes”
button in the Web interface can be configured via the API.
To limit access to the API, use the Allowed SNMP and API IP/Range setting on the BASIC >
Administration page. The IP addresses you enter in that field can also establish an SNMP connection
46
Barracuda Spam & Virus Firewall Administrator’s Guide
to the system.To secure use of the API, you must also create an API password which can be entered
on this page.
Tracking Changes to the Configuration and User Login Activities
The syslog function of the Barracuda Spam & Virus Firewall provides two kinds of logs, capturing:
•
•
User login activities and any configuration changes made on the device.
Data related to mail flow. This data is the same information as that used to build the Message
Log in the Barracuda Spam & Virus Firewall.
From the ADVANCED > Troubleshooting page, use the Monitor Web Syslog button view the Web
syslog output. You can also configure a syslog server as described in the Using a Syslog Server to
Centrally Monitor System Logs, page 104.
Securing the Barracuda Spam & Virus Firewall 47
Limiting User Access
Securing User Access With Single Sign On
With Single Sign-On (SSO), users can log into their quarantine inbox via the Web interface using their
domain passwords instead of a password managed separately by the Barracuda Spam & Virus
Firewall. Single Sign On is not a global setting, and can only be configured by the administrator or a
Domain Admin. See Managing Accounts and Domains, page 83 for more detail about role-based
administration of the Barracuda Spam & Virus Firewall.
Warning
If enabling Single Sign On for a domain, you should also configure HTTPS/SSL Access Only at
the global level on the ADVANCED > Secure Administration page to protect the transmission of
network passwords. See Enabling SSL for Administrators and Users, page 38 to configure SSL on
the Barracuda Spam & Virus Firewall.
LDAP, POP or RADIUS Authentication
You can configure the Barracuda Spam & Virus Firewall to authorize user accounts using an LDAP,
POP, or RADIUS server. This feature is available on the Barracuda Spam & Virus Firewall 400 and
higher and is configured at the per-domain level, not as a global setting. These user account
authentication mechanisms are configured from the DOMAINS tab by selecting the Domains page and
clicking the Manage Domain link from the list of domains.
To select the authentication type, navigate to the USERS > Single Sign-On page for the selected
domain and select the Authentication Type. For RADIUS and POP, fill in the server settings on the
page. For LDAP, configure the settings on the USERS > LDAP Configuration page.
LDAP server types supported include Active Directory, Open LDAP, Novell eDirectory and Domino
Directory.
To effectively disable single sign-on, set the Authentication type to Local on the USERS > Single
Sign-On page for the selected domain.Using local authentication means that the Barracuda Spam &
Virus Firewall will assign a password to users for logging into the appliance.
Limiting User Access to a Clustered System
When clustering multiple Barracuda Spam & Virus Firewalls, you can designate one device as the
“host” from which to perform administration of the cluster. To do this, you would simply set that
device to be the “Quarantine Host” and not direct any email traffic to it. This enables tighter security
by restricting Web interface access to only one Barracuda Spam & Virus Firewall in the cluster as
well as limiting users’ access to that node when checking their quarantine inboxes. In this
configuration, quarantine notifications from all Barracuda Spam & Virus Firewalls in the cluster will
direct users to that Quarantine Host. Set the IP address of the Quarantine Host device in the cluster
from the BASIC > Quarantine page.
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Barracuda Spam & Virus Firewall Administrator’s Guide
Advanced Email Security Policy
The Barracuda Spam & Virus Firewall offers various levels of secure communications over SMTP
for both incoming email and outbound email that is relayed through the Barracuda Spam & Virus
Firewall from your network.
SMTP/TLS (Transport Layer Security) encryption
TLS can provide authentication (identification of the communication partner), privacy/confidentiality
(communication is not intercepted or eavesdropped), and integrity (message has not been modified)
over an SMTP connection. TLS uses different algorithms for encryption, signing and message
authentication. The Barracuda Spam & Virus Firewall can communicate via SMTP over TLS/SSL
over the Internet when both the sender and recipient are using a Barracuda Spam & Virus Firewall or
another STARTTLS-capable mail server.
To enable TLS encryption, you need to first configure an SSL certificate from the ADVANCED >
Secure Administration page following the steps in the online help screen. There are three certificate
options, and choosing the Default/Barracuda Networks certificate serves the purpose in most cases.
Next, from the ADVANCED > Email Protocol page, in the SMTP over TLS/SSL section, set Enable
SMTP over TLS/SSL to Yes. Note that SMTP over TLS will be enabled for incoming connections
and will be attempted for outgoing connections - the receiving server needs to support it. This
configures SMTP over TLS/SSL at the global level.
To require encrypted TLS connections at the per-domain level for either senders or recipients (as long
as the receiving server supports TLS), from the DOMAINS tab, click Manage Domain for a particular
domain. On the then ADVANCED > Email Protocol page, enter the domain names for which email will
be required to be transmitted over a TLS connection. Only the administrator or Domain Admin can
configure these settings.
Securing the Outbound Relay of Email
The Barracuda Spam & Virus Firewall may be configured to relay outbound email simultaneously
with scanning inbound mail as described in Configuring Basic Scanning of Outgoing Mail, page 35.
On the ADVANCED > Outbound page, you can configure the IP address and/or domain name of one
or more outbound servers that can relay outbound email through the Barracuda Spam & Virus
Firewall to the Internet. The most secure practice is to specify an IP address rather than a domain
name for your trusted mail or relay server(s) to prevent domain name spoofing. Use the Trusted
Relay IP/Range to do so.
If you do decide to specify a domain name with the Trusted Relay Host/Domain field, it is
recommended to configure either SASL/SMTP authentication or LDAP authentication using your
LDAP directory as well. See the ADVANCED > Outbound page for sender authentication for outbound
relayed email.
Invalid Bounce Suppression
Invalid Bounce Suppression can be used when all outgoing email is relayed through the Barracuda
Spam & Virus Firewall and is designed to reduce the number of bounce messages to forged return
addresses. Enabling this feature will block any bounce message that did not originate as an outbound
Securing the Barracuda Spam & Virus Firewall 49
message from this Barracuda Spam & Virus Firewall, or others on the same network with the same
shared secret.
All email sent out through the Barracuda Spam & Virus Firewall contains a return address tagged with
an encrypted password (the Bounce Suppression Shared Secret) and expiration time. Any bounce
notice coming into the Barracuda Spam & Virus Firewall from the Internet that does not include these
components is blocked and recorded in the Message Log with the reason "Invalid Bounce". For more
details see the online help on the BLOCK/ACCEPT > Sender Authentication page.
Note that if you have a cluster of Barracuda Spam & Virus Firewalls, the Bounce Suppression
Shared Secret will be synchronized across all devices in the cluster.
50
Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 5
Advanced Spam Filtering Policy
The goal in configuring a Barracuda Spam & Virus Firewall is to identify the most spam without
blocking valid messages. This chapter addresses effective use of custom spam filtering policy as well
as optional, more sophisticated spam identification methods.
Rate Control....................................................................................... 52
IP Analysis ......................................................................................... 54
Content Analysis ................................................................................ 57
Advanced Spam Filtering Policy 51
Rate Control
The Barracuda Spam & Virus Firewall Rate Control feature protects the system from spammers or
spam-programs (also known as "spam-bots") that send large amounts of email to the server in a small
amount of time. Rate Control is configured on the BLOCK/ACCEPT > Rate Control page.
How Rate Control Works
As part of the Connection Management Layer, the Rate Control mechanism counts the number of
connections to the Barracuda Spam & Virus Firewall in a half hour period and compares that number
to the Rate Control threshold, which is the maximum number of connections allowed from any one
IP address in this half-hour time frame. If the number of connections from a single IP address exceeds
the Rate Control threshold within the half hour period, the Barracuda Spam & Virus Firewall will
defer any further connection attempts from that particular IP address until the next half hour time
frame and log each attempt as deferred in the Message Log with a Reason of ‘Rate Control’.
In this case, for each message deferred, the sender will receive a 4xx level error message instructing
the mail server to retry after a predefined time interval. Well-behaving mail servers act upon the defer
message and will try sending the message again later, while email from large volume spammers will
not retry sending the email again.
When Rate Control Takes Effect
When Rate Control is first enabled on the Barracuda Spam & Virus Firewall, or after a change is made
to the Rate Control threshold, five (5) unique IP addresses must connect before Rate Control is
applied and/or the change takes effect. This is to take into account that you may have another
appliance receiving email (i.e., a front-end Mail Transfer Agent (MTA) or a trusted forwarder) before
the Barracuda Spam & Virus Firewall. Once 5 or more IP addresses have made connections to the
Barracuda Spam & Virus Firewall, it indicates that mail is also coming in from other outside sources
and rate control should be applied.
Exemptions from Rate Control
You can exempt trusted IP addresses from Rate Control by adding a trusted IP address to the Rate
Control Exemption/IP range list. Also, any IP address that you enter as a trusted forwarder on the
BASIC > IP Configuration page will be exempted from Rate Control.
When configuring Rate Control, keep in mind the following
52
•
•
•
•
A rate of 50 is conservative
Some customers can lower this safely
Caution – False positives can be hard to diagnose
Common setting is for 20-30 emails/ half hour
•
High volume recipients may need to either set the Rate Control threshold above 50 and/or list
IP addresses from which they expect to receive a high volume of email in the Rate
Control Exemption/IP range list.
Barracuda Spam & Virus Firewall Administrator’s Guide
Note
Organizations that relay email through known servers or communicate frequently with known
partners can and should add the IP addresses of those trusted relays and good mail servers to the
Rate Control Exemption/IP range list.
Advanced Spam Filtering Policy 53
IP Analysis
After applying rate controls, the Barracuda Spam & Virus Firewall then performs analysis on the IP
address, applying tag, quarantine or block policies that you configure in the BLOCK/ACCEPT pages.
Once the true sender of an email message is identified, the reputation and intent of that sender should
be determined before accepting the message as valid, or “not spam”. The best way to address both
issues is to know the IP addresses of trusted senders and forwarders of email and define those on the
Barracuda Spam & Virus Firewall as “Allowed” by adding them to a of known good senders. Various
methods for discerning “good” senders of email versus spammers are described in this section to help
you to quickly configure your Barracuda Spam & Virus Firewall per the needs of your organization.
Warning
Barracuda Networks does NOT recommend whitelisting domains because spammers will spoof
domain names. When possible, it is recommended to (Allow) by IP address only.
Trusted Forwarders
On the BASIC > IP Configuration page you can specify the IP addresses of any machines that are set
up specifically to forward mail to the Barracuda Spam & Virus Firewall from outside sources. These
are called Trusted Forwarders and will bypass SPF, Rate Control and IP Reputation checks. In the
IP Analysis layer, the Barracuda Spam & Virus Firewall examines the Received headers and
evaluates the first non-trusted IP address when applying block and accept policies. To use the Trusted
Forwarder feature, you must enable the Deep Header Scan feature on the BLOCK/ACCEPT > IP
Reputation page.
IP Block and Accept Precedence
These block and accept policies are covered in this section and are applied in the following order of
precedence:
1.
IP whitelists
2.
IP blacklists
3.
Sender domain s
4.
Sender address s
5.
Email recipient s
6.
Sender domain blacklists
7.
Sender address blacklists
8.
Email recipient blacklists
9.
The Barracuda IP Reputation check
10. Any configured custom RBLs
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Barracuda Spam & Virus Firewall Administrator’s Guide
IP Reputation
The Barracuda Spam & Virus Firewall enables administrators to define a list of trusted mail servers
by IP address. By adding IP addresses to this list, administrators can avoid spam scanning of good
email, thereby both reducing processing load and eliminating the chances of false positives. Note that
virus scanning and banned attachment checks are still enforced.
Likewise you can define a list of bad email senders. In some cases, you may choose to utilize the IP
blacklists (as described above) to restrict specific mail servers as a matter of policy rather than as a
matter of spam.
Barracuda IP Reputation (BBL)
Barracuda Reputation is a database maintained by Barracuda Central and includes a list of IP
addresses of known, good senders as well as known spammers, or IP addresses with a “poor”
reputation. This data is collected from spam traps and other systems throughout the Internet. The
sending histories associated with the IP addresses of all sending mail servers are analyzed to
determine the likelihood of legitimate messages arriving from those addresses. Updates to Barracuda
Reputation are made continuously by the engineers at Barracuda Central and are delivered to all
Barracuda Spam & Virus Firewalls via Energize Updates.
On the BLOCK/ACCEPT > IP Reputation page, it is strongly recommended that the Barracuda IP
Reputation option be set to "Block". Turning the Barracuda IP Whitelist option to On will enable
messages from known good IP addresses to bypass all spam filtering, saving resources, while still
being scanned for viruses.
Exempting IP Addresses from the BBL and Other Blacklists
The BBL and other blacklists that you specify on the BLOCK/ACCEPT > IP Reputation page can be
overridden by listing the IP addresses of trusted forwarders of email or listing email addresses:
• In the Allowed IP/Range section of the BLOCK/ACCEPT > IP Filters page, or in the
Barracuda Reputation External RBL IP Exemption Range on the BLOCK/ACCEPT >
IP Reputation page.
• In the Allowed Email Addresses section of the BLOCK/ACCEPT > Sender Email page.
Subscribing to External Blacklist Services
The BLOCK/ACCEPT > IP Reputation page also enables you to subscribe to various blacklist services.
Several organizations maintain external block lists, such as spamhaus.org. External blacklists,
sometimes called DNSBLs or RBLs, are lists of Internet addresses from which potential spam
originates. As with the Barracuda Reputation list of IP addresses, The Barracuda Spam & Virus
Firewall uses these lists to verify the authenticity of the messages you receive. If the system receives
a message from a sender on a blacklist, the message is either blocked, quarantined or tagged
depending on the blacklist settings on the BLOCK/ACCEPT > IP Reputation and BLOCK/ACCEPT >
Sender Email pages.
Be aware that blacklists can generate false-positives (legitimate messages that are blocked). However,
because the Barracuda Spam & Virus Firewall sends notifications when it rejects such messages, the
sender will be notified and legitimate senders will therefore know to re-send their message.
Subscribing to blacklist services does not hinder the performance of the Barracuda Spam & Virus
Firewall. Query response time is typically in milliseconds, so delays are negligible. Once the
Advanced Spam Filtering Policy 55
Barracuda Spam & Virus Firewall queries a blacklist service, that query is cached on your own local
DNS for a period of time, making further queries very fast.
Sender Whitelisting - Precedence
The users’sender whitelists (if the whitelist/blacklist setting is enabled for user accounts) can be
overridden by global settings. For example, if the administrator turns on Spoof Protection, which is a
global setting, it will supersede any user’s entry. If a user needs to supercede an global IP address
block, that user should communicate to the administrator and request that the email or IP address be
added to a global on the Barracuda Spam & Virus Firewall.
File attachment policy is the only exception to this rule. If the administrator configures the Barracuda
Spam & Virus Firewall to block file attachments, the user can whitelist an email address which will
take precedence over the attachment block.
Reverse DNS Blocking whitelisting
The Barracuda Spam & Virus Firewall does a reverse DNS lookup on incoming IP connections and
finds the hostname associated with the IP address of the sender. By configuring rules on the
BLOCK/ACCEPT > Reverse DNS page, you can choose to apply “common” reverse DNS rules by
country, “custom” rules that you define, or both to tag, quarantine or block messages from those
domains.
The last part of a hostname is known as the top level domain, or TLD. Most TLDs include a country
identifier, such as .ca for Canada, .ru for Russia, etc. If most or all of the mail that you receive from
a particular country is spam, you can use the Common Reverse DNS Rules to tag, block or
quarantine any message that has an associated hostname that includes that country's TLD. Email
which is not blocked is subject to all of the usual spam and virus checks. Use the Custom Reverse
DNS Rules to tag, quarantine or block messages from hostnames ending with values that you specify.
List the sending domains or subdomains you want to on the BLOCK/ACCEPT > Sender Domain page.
Barracuda Spam & Virus Firewall queries a blacklist service, that query is cached on your own local
DNS for a period of time, making further queries very fast.
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Barracuda Spam & Virus Firewall Administrator’s Guide
Content Analysis
Custom Content Filters
The Barracuda Spam & Virus Firewall enables administrators to set custom content filters based on
the subject line, message headers, message body and attachment file type. In general, administrators
do not need to set their own filters for the purposes of blocking spam, as these forms of rules are
delivered to Barracuda Spam & Virus Firewalls automatically through Barracuda Energize Updates.
See the filtering pages on the BLOCK/ACCEPT tab for details on settings. The online help for the
BLOCK/ACCEPT > Subject/Header Filters and Body Filters pages include a link to a Regular
Expressions help page that covers expressions you can use for advanced filtering.
Note that HTML comments and tags imbedded between characters in the HTML source of a message
are filtered out so content filtering applies to the actual words as they appear when viewed in a Web
browser.
Attachment Filtering
From the BLOCK/ACCEPT > Attachment Filters page you can block or quarantine messages if they
contain attachments with certain file extensions.The default maximum attachment size allowed by
your Barracuda Spam & Virus Firewall is 100 megabytes. If a message exceeds this size, the
Barracuda Spam & Virus Firewall rejects the message and the sending server notifies the sender that
their message did not go through. Contact Barracuda Networks Technical Support to change this
maximum.
All messages, including those from ed senders, go through attachment filtering. This means that if a
sender on your sends a message containing an unallowed attachment type, that message is either
blocked or quarantined (depending on your settings).
Blocking Email by Country
Set tag, quarantine and block policies for specific character sets or regional spam settings using the
BLOCK/ACCEPT > Regional Settings page, where you can filter by TLDs (top level domains) specific
to a country. Here you can also choose to specifically allow messages based on valid Chinese or
Japanese language content and enable compliance with PRC (People’s Republic of China)
requirements if your Barracuda Spam & Virus Firewall resides in the PRC.
Fingerprint Analysis
A message “fingerprint” is based on commonly used message components (e.g., an image) across
many instances of spam. Fingerprint analysis is often as a useful mechanism to block future instances
of spam once an early outbreak is identified. Spam fingerprints blocked based on a real-time check
will display an '*' before "Fingerprint" in the Message Log. In order to detect real-time spam
fingerprints, Barracuda Real-Time Protection must be enabled on the BASIC > Virus Checking
page.
Engineers at Barracuda Central work around the clock to identify new spam fingerprints which are
then updated on all Barracuda Spam & Virus Firewalls through hourly Barracuda Energize Updates.
Fingerprint Analysis is configured on the BASIC > Spam Checking page.
Advanced Spam Filtering Policy 57
Intent Analysis
All spam messages have an “intent” – to get a user to reply to an email, visit a Web site or call a phone
number. Intent analysis involves researching email addresses, Web links and phone numbers
embedded in email messages to determine whether they are associated with legitimate entities.
Frequently, Intent Analysis is the defense layer that catches phishing attacks. The Barracuda Spam &
Virus Firewall features multiple forms of Intent Analysis:
• Intent analysis - Markers of intent, such as URLs, are extracted and compared against a
database maintained by Barracuda Central, and then delivered to the Barracuda Spam &
Virus Firewall via hourly Barracuda Energize Updates. Intent can also be associated with
general content categories, several of which are provided for Intent filtering.
• Real-time intent analysis - For new domain names that may come into use, Real-Time
Intent Analysis involves performing DNS lookups against known URL block lists.
• Multilevel intent analysis - Use of free Web sites to redirect to known spammer Web
sites is a growing practice used by spammers to hide or obfuscate their identity from mail
scanning techniques such as Intent Analysis. Multilevel Intent Analysis involves
inspecting the results of Web queries to URLs of well-known free Web sites for
redirections to known spammer sites.
Intent Analysis is configured on the BASIC > Spam Checking page.
Image Analysis
Image spam represents about one third of all traffic on the Internet. While Fingerprint Analysis
captures a significant percentage of images after they have been seen, the Barracuda Spam & Virus
Firewall also uses Image Analysis techniques which protect against new image variants. These
techniques include:
• Optical character recognition (OCR) - Embedding text in images is a popular
spamming practice to avoid text processing in anti-spam engines. OCR enables the
Barracuda Spam & Virus Firewall to analyze the text rendered inside the images.
• Image processing - To mitigate attempts by spammers to foil OCR through speckling,
shading or color manipulation, the Barracuda Spam & Virus Firewall also utilizes a
number of lightweight image processing technologies to normalize the images prior to
the OCR phase. More heavyweight image processing algorithms are utilized at Barracuda
Central to quickly generate fingerprints that can be used by Barracuda Spam & Virus
Firewalls to block messages.
• Animated GIF analysis - The Barracuda Spam & Virus Firewall contains specialized
algorithms for analyzing animated GIFs for suspect content.
Image Analysis is configured on the BASIC > Spam Checking page.
Bayesian Analysis
How Bayesian Analysis Works
Bayesian Analysis is a linguistic algorithm that profiles language used in both spam messages and
legitimate email for any particular user or organization. To determine the likelihood that a new email
is spam, Bayesian Analysis compares the words and phrases used in the new email against the corpus
of previously identified email. The Barracuda Spam & Virus Firewall only uses Bayesian Analysis
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Barracuda Spam & Virus Firewall Administrator’s Guide
after administrators or users profile a corpus of at least 200 legitimate messages and 200 spam
messages.
Global Bayesian Filtering Versus Per-User
The administrator can configure a global Bayesian database, per-user Bayesian databases or disable
Bayesian altogether. With the global setting, which is configured on the BASIC > Spam Checking
page, the administrator trains and maintains one Bayesian database for all users. With the per-user
configuration, users must train and manage their own Bayesian databases, which they access from
their PREFERENCES > Spam Checking page. There are pros and cons to each configuration.
A global Bayesian database is typically more effective than per-user databases because the
administrator can maintain and reset it for all to use, thereby providing a more reliable source of
Bayesian management. If, however, the Barracuda Spam & Virus Firewall is filtering mail for many
domains, the users of which expect to receive different types of email, it could be either difficult or
impossible to train the global Bayesian database to identify spam for all users. For example, if one
domain for a medical organization typically receives email regarding medical topics, while another
domain for a political organization tends to receive political emails and yet another domain is an
entertainment site, then what is spam to one domain may be valid email for another on the same
Barracuda Spam & Virus Firewall. In this case, per-user Bayesian filtering would make more sense
than global.
In most cases, however, it is not practical to enable Bayesian at the user level because maintaining an
accurate Bayesian database requires that users to understand the concept of how Bayesian analysis
works and how to use it as an effective tool. That said, while sophisticated users may be trained and
savvy enough to initially train their own Bayesian database, they may not have the time to spend in
their regular work schedule to effectively maintain their Bayesian databases.
Note
Because spammers frequently change tactics and content, Bayesian data can quickly become
“stale” if the database is not reset from time to time and new messages consistently classified as
spam or not spam in equal numbers. Without this maintenance the users may see false positives
resulting in the blocking of good email.
Getting the Best Accuracy From the Bayesian Database
All Bayesian systems rely on the fact that messages classified are not much different than new
messages arriving. Over time however, spam messages change drastically and the Bayesian system –
while initially able to compensate for the new format – gradually declines in its effectiveness. When
this happens new classifications are needed to update the Bayesian database. To keep a Bayesian
database accurate:
• For a global Bayesian database, the administrator should periodically clear it out by
resetting it from the BASIC > Spam Checking page, then, from the BASIC > Message Log
page, marking at least 200 messages as either Spam or Not spam using the buttons on the
page. Bayesian filtering will NOT take effect until 200 or more of each spam and notspam messages are marked as such.
• For each per-user database, the user should can reset their own Bayesian database and
follow up with marking 200 or more messages as spam or not spam, either in their
quarantine inbox (QUARANTINE > Quarantine Inbox page) or from their regular email
client if they have installed either the Outlook plugin or Lotus plugin (see below).
Advanced Spam Filtering Policy 59
When to Use Bayesian Analysis
Barracuda Networks does not recommend using Bayesian filtering in most circumstances. With
Energize Updates constantly updating the Barracuda Spam Firewall with protection against the latest
spam and virus threats, spam accuracy should not be an issue for most organizations.
A case for using Bayesian Analysis would depend on the following:
• You are using global Bayesian as opposed to per-user, and the users in the organization
tend to be a homogenous population with regard to the kind of content considered to be
‘valid’ email versus spam. This situation would make it easier for an administrator to
“train” the global Bayesian database as to what is spam and what is not spam for the
organization.
• Your organization requires a very high granularity of accuracy for identifying spam.
• If enabling Bayesian at the per-user level, users are sophisticated and can be trained to
properly identify ‘valid’ messages versus spam so as to train the Bayesian database, and
are willing to consistently mark BOTH ‘valid’ messages and spam messages in equal
numbers so as to maintain the Bayesian database.
• The administrator and/or users are disciplined about resetting the Bayesian database(s) on
a regular basis and re-initializing with 200 each of marked spam and not spam messages
to ‘keep current’ with new spam techniques over time.
Outlook and Lotus Notes Plugins
If per-user Bayesian is enabled, on models 300 and higher of the Barracuda Spam & Virus Firewall,
the administrator can choose to allow users to download a plugin that allows messages to be classified
as Spam or Not Spam directly from the email client.
Plugins are available for the Lotus Notes mail client and for Microsoft Outlook. See the USERS > User
Features page to enable users to download the Microsoft Outlook plugin, which they can do from the
login page if this feature is enabled, or, as the administrator, to download and install the Lotus Notes
Plugin and view an overview document of how it works.
Note
If the SMTP option Remove Barracuda Headers is turned off in the ADVANCED > Email
Protocol page, any custom X-headers that the Barracuda Spam & Virus Firewall has applied
before the message leaves the appliance will be removed. This is not a recommended setting, and
if these headers are removed, any Barracuda Outlook plugin or other plugin will not work
correctly.
Bayesian Poisoning
Some spammers will insert content in messages intended to bypass spam rules, such as excerpts of
text from books or other content that may look “legitimate” in order to fool spam filtering algorithms.
This tactic is called Bayesian Poisoning and could reduce the effectiveness of a Bayesian database if
many of these messages are marked as either spam or not spam. The Barracuda Networks Bayesian
engine is, however, very sophisticated and protects against Bayesian Poisoning if administrators or
users consistently maintain their databases.
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Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 6
Advanced Configuration
This chapter covers advanced administration topics including configuring sender authentication,
recipient verification, advanced networking topics, clustering the Barracuda Spam & Virus Firewall
and remote administration via the Barracuda API.
Sender Authentication ........................................................................ 62
Recipient Verification......................................................................... 65
Remote IMAP/POP Accounts ............................................................ 66
Clustering the Barracuda Spam & Virus Firewall ............................ 67
Advanced Networking ........................................................................ 70
Non-Delivery Reports (NDRs) ........................................................... 71
Remote Administration....................................................................... 72
Advanced Configuration 61
Sender Authentication
This is a key feature of the Barracuda Spam & Virus Firewall to protect your network and users from
spammers who might “spoof” a domain or otherwise hide the identity of the true sender. The
following techniques are used to verify the “from” address of a message.
Mail Protocol (SMTP) Checking
The Barracuda Spam & Virus Firewall can perform thorough checks on incoming email for RFC 821
compliance, require mail clients to introduce themselves with an SMTP "HELO" or "EHLO"
command before stating a sender and otherwise manage SMTP protocol to block spammers. See the
ADVANCED > Email Protocol page for these and other optional SMTP settings.
Sender Spoof Protection
The Barracuda Spam & Virus Firewall has the option to prevent “spoofing” of an organization’s own
domain by blocking emails with that domain name in the “From” field that are sent from outside the
organization. Note that sender spoof protection should not be enabled if the organization sends
messages from outside their internal email infrastructure (e.g., in the case of marketing bulk-mail
services).
The Sender Spoof Protection feature can be configured at the global level from the ADVANCED >
Email Protocol page or at the per-domain level on the DOMAINS > Manage Domain > ADVANCED >
Email Protocol page. At the domain level, however, this feature is labeled as Reject messages from
my domain.
Note that if the administrator enables Sender Spoof Protection at the global level it will supersede
any entry created at the per-user level by a User, Helpdesk or Domain Admin account holder.
Invalid Bounce Suppression
The Invalid Bounce Suppression feature is used to determine whether or not the bounce address
specified in a message is valid. It is designed to reduce the number of bounce messages to forged
return addresses; i.e., don’t get bounced messages from spammers who spoof your domain or email
address. Every email sent from the Barracuda Spam & Virus Firewall is tagged with an encrypted
password and expiration time. With Invalid Bounce Suppression enabled, any bounced email
received by the Barracuda Spam & Virus Firewall that does not include that tag is blocked. Each
blocked message is recorded in the Message Log with the reason "Invalid Bounce".
To use the Invalid Bounce Suppression feature, the Barracuda Spam & Virus Firewall must have
Outbound Relay configured on the ADVANCED > Outbound page. For more details about Outbound
Relay, refer to Configuring Basic Scanning of Outgoing Mail on page 35.
Configure Invalid Bounce Suppression on the BLOCK/ACCEPT > Sender Authentication page and
enter a Bounce Suppression Shared Secret as a non-null password which will be included in the
headers of valid emails sent from and bounced back to the Barracuda Spam & Virus Firewall. Email
bounces that don’t include the password will be blocked if this feature is enabled.
In a clustered environment, the Bounce Suppression Shared Secret will be synchronized across all
Barracuda Spam & Virus Firewalls in the cluster.
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Barracuda Spam & Virus Firewall Administrator’s Guide
Sender Policy Framework (SPF)
Sender Policy Framework (SPF) is an open standard specifying a method to prevent sender address
forgery. The current version of SPF protects the envelope sender address, which is used for the
delivery of messages.
SPF works by having domains publish reverse MX records to display which machines are designated
as mail sending machines for that domain. When receiving a message from a domain, the recipient
can check those records to make sure mail is coming from a designated sending machine. If the
message fails the SFP check, it is assumed to be spam. Enabling this feature does create more
performance overhead for the system due to the multiple DNS queries needed to retrieve a domain's
SPF record; for this reason, the default setting is No (off). For more information on SPF, please visit
http://www.openspf.org.
You may specify a list of Trusted Forwarder IP addresses, on the BASIC > IP Configuration page,
which will be ignored when performing SPF checks. Trusted Forwarders are mail servers that are set
up specifically to forward email to the Barracuda Spam & Virus Firewall from outside sources. The
Barracuda Spam & Virus Firewall scans the IP addresses in the Received From headers list of each
email and performs an SPF check on the first IP address that is not in the list of Trusted Forwarders.
Messages that fail SPF check can be either tagged or blocked and will be logged as such. The
recommended setting is to Tag messages identified by SPF as spam so that if there is any
possibility that a message is legitimate, it will be allowed to go on to the next stage of processing.
Configure the Sender Policy Framework feature from the BLOCK/ACCEPT > Sender Authentication
page.
Domain Keys (DKIM) Inspection
DomainKeys is a method of email authentication that enables a sending domain to cryptographically
sign outgoing messages, allowing the sending domain to assert responsibility for a message. When
receiving a message from a domain, the Barracuda Spam & Virus Firewall can check the signature of
the message to verify that the message is, indeed, from the sending domain and that the message has
not been tampered with. Because most spam messages contain spoofed addresses, DomainKeys can
help greatly in the reduction of spam.
DomainKeys uses a public and private key-pairs system. An encrypted public key is published to the
sending server's DNS records and then each outgoing message is signed by the server using the
corresponding encrypted private key. For incoming messages, when the Barracuda Spam & Virus
Firewall sees that a message has been signed, it will retrieve the public key from the sending server's
DNS records and then compare that key with the message's DomainKeys signature to determine its
validity. If the incoming message cannot be verified, the Barracuda Spam & Virus Firewall knows it
contains a spoofed address or has been tampered with or changed.
The benefits of enabling this feature include:
•
•
•
•
Email sender is validated
Email body is validated
Validation through DNS is difficult to foil
DomainKeys works well with email forwarding because it doesn’t deal with the relay
server IP address
You can choose to tag, block or quarantine both DKIM signed messages that fail the DKIM database
check as well as unsigned messages, depending on how you configure DomainKeys Inspection on
the BLOCK/ACCEPT > Sender Authentication page. You can also exempt domains from being tagged,
Advanced Configuration 63
quarantined or blocked if they fail this check. As stated elsewhere in this guide, it is safest to NOT
exempt domain names from any kind of spam filtering due to the possibility of domain name spoofing
by spammers.
DomainKeys inspection does require more CPU resources to encrypt & decrypt the key and is turned
off by default.
Custom policies
Organizations can define their own allowed sender domains or email addresses for sender
authentication using the BLOCK/ACCEPT > Sender Email and BLOCK/ACCEPT > Sender Domain
pages, but the safest way to indicate valid senders on the Barracuda Spam & Virus Firewall is to
(allow) the IP addresses of trusted email servers on the BLOCK/ACCEPT > IP Filters page, then
blacklist (block, quarantine or tag) their domain names on the BLOCK/ACCEPT > Sender Domain
page to prevent domain name spoofing.
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Barracuda Spam & Virus Firewall Administrator’s Guide
Recipient Verification
LDAP lookup
On the Barracuda Spam & Virus Firewall 300 and higher, email recipients can be validated with your
existing LDAP server. Configuration of LDAP lookup is done by domain from the DOMAINS >
Domain Manager page. After clicking Manage Domain for the selected domain, you’ll configure
LDAP on the USERS > LDAP Configuration page. See the online help on that page for details about
entering your server details. If LDAP is not configured, the Barracuda Spam & Virus Firewall will do
SMTP recipient verification through RCPT TO commands.
LDAP server types supported include Active Directory, Novell eDirectory, Domino Directory and
OpenLDAP.
Explicit Accepted Users (Valid Recipients)
If LDAP lookup is not being used for recipient verification, the Barracuda Spam & Virus Firewall
provides a local database with which email recipients can be compared for validation. “Valid
Recipients” can be specified either at the global level from the ADVANCED > Explicit Users page or
at the per-domain level from the DOMAINS > Domain Manager > USERS > Valid Recipients page.
To administer the local database, either at the global or domain level, fill in the text box in the Explicit
Accepted Users section of the page, entering each email address for which the Barracuda Spam &
Virus Firewall should accept email. If you select Yes for the Only accept email for these recipients
feature, email will REJECTED for any email recipients not in the list. Note that domain-specific lists
override the global list.
Alias Linking
Alias linking allows quarantined email from multiple accounts to be directed to one account when
using per-user quarantine. In the ADVANCED > Explicit Users page you can specify the email
addresses to be linked together in the Explicit Accepted Users and Alias Linking text box. See the
online help on that page for more details.The quarantine account for all of the linked email addresses
will be associated with the first email address. Make sure to also enter the first email address on a
separate line as well. In this way, a "catchall" account can be created to receive all quarantined emails
from a particular domain.
Advanced Configuration 65
Remote IMAP/POP Accounts
The Barracuda Spam & Virus Firewall provides an email-retrieval and forwarding utility which
fetches email from remote mail servers and forwards it to your local machine's delivery system. You
can repeatedly poll each account at a specified interval. This utility can gather mail from servers
supporting POP3 and IMAP and is configured from the ADVANCED > Remote IMAP/POP page.
Note that all email will be DELETED from the remote mail server after retrieval by the Barracuda
Spam & Virus Firewall.
There are two types of operations for each account from which the Remote Accounts utility retrieves
mail: Global and User. With the User type, it is assumed that all messages in the user's account are
intended for a single recipient. The Global type is used when multiple recipients under the same
domain are specified for a particular server account.
From the ADVANCED > Remote IMAP/POP page you can specify polling interval, SSL (yes/no), user
account passwords and email addresses.
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Clustering the Barracuda Spam & Virus Firewall
Deploying clustered Barracuda Spam & Virus Firewalls is easy - once you configure one of the
devices, configuration settings are synchronized across the cluster almost immediately. Clustered
systems can be geographically dispersed and do not need to be located on the same network. Every
Barracuda Spam & Virus Firewall in a cluster must be the same model (400 and above) and have the
same version of firmware installed.
Instructions to set up and configure a Barracuda Spam & Virus Firewall cluster, including removing
a system from the cluster, are detailed on the ADVANCED > Clustering page.
Setting Up Clustered Systems
To cluster two Barracuda Spam & Virus Firewalls together, where one system is designated as
“Barracuda1” and the other is designated “Barracuda2”, do the following:
1.
Complete the installation process for each system as described in install.fm, 25.
2.
From the ADVANCED > Task Manager page on the Barracuda1 system, verify that no processes
are running. Complete this step for the Barracuda2 system as well. No processes should be
running when you add a system to a cluster.
3.
From the ADVANCED > Clustering page on the Barracuda1 system, enter a Shared Secret
password for the cluster, and click Save Changes.
4.
From the ADVANCED > Clustering page on the Barracuda2 system, do the following:
4a. Enter the same Shared Secret password, and click Save Changes.
4b. In the Clustered Systems section, enter the IP address of the Barracuda1 system and
click Join Cluster.
5.
On each Barracuda system, refresh the ADVANCED > Clustering page, and verify that:
• Each system’s IP address appears in the Clustered Systems list
• The status of each server is green
The following example shows two servers in a cluster with a green status.
Figure 6.1: Two Barracuda Spam & Virus Firewall systems in a cluster
Make sure each clustered server’s
IP address appears in this list.
Make sure the status of
each server is green.
Advanced Configuration 67
6.
Distribute the incoming mail traffic to each Barracuda Spam & Virus Firewall using a Barracuda
Load Balancer (preferred) or other load balancing device, or use multiple DNS MX records of
equal priority.
7.
Each Barracuda Spam & Virus Firewall in a cluster must be on exactly the same firmware
version. See the online help on the ADVANCED > Clustering page for instructions in updating
the firmware on all systems in the cluster at the same time.
Centralized Policy Management With a Quarantine Host
You can optionally designate one Barracuda Spam & Virus Firewall as the “host” of the cluster such
that all administration of configuration settings and access to per-user quarantine for the cluster can
only be accessed and set from that node. This option has two advantages: it provides for additional
security by limiting access to administration of the cluster, and it protects the user interface from mail
processing load since, with this configuration, you do not direct any email traffic to the host node.
If you want to set up one Barracuda Spam & Virus Firewall as the host of the cluster, enter the host
name of that device in the Quarantine Host field on the BASIC > Quarantine page and do not direct
any email to that device.
Redundancy of user quarantine data on the cluster
Each user account has a primary and backup server in the cluster. Regardless of how many Barracuda
Spam & Virus Firewalls there are in the cluster, there are always two appliances that have the same
quarantine information (configuration and quarantine messages).
Data Not Synchronized Across the Cluster
Clustering not only makes managing multiple Barracuda Spam & Virus Firewalls more manageable,
it also provides 100% redundant coverage of the propagated data. However, for practical reasons,
some data is not propagated to the other clustered systems when a new system joins.
Energize updates do not synchronize across systems in a cluster. The following Barracuda Spam &
Virus Firewall configurations are considered unique and will not sync to match other Barracuda Spam
& Virus Firewalls in a cluster:
• IP Address, Subnet Mask, and Default Gateway (on the BASIC > IP Configuration
page)
• Primary DNS Server and Secondary DNS Server (on the BASIC > IP Configuration
page)
• Serial number (this will never change)
• Hostname (on the BASIC > IP Configuration page)
• Any advanced IP configuration (Barracuda Spam & Virus Firewall 600 and above, on the
ADVANCED > Advanced Networking page)
• Administrator password
• Guest password
• Time Zone (on the BASIC > Administration page)
• Cluster Host Name (on the ADVANCED > Clustering page)
• Cluster Shared Secret, though this must be the same for the cluster to work properly (on
the ADVANCED > Clustering page)
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•
•
•
•
•
•
•
•
•
•
•
•
Local Host Map (on the ADVANCED > Clustering page)
SMTP Welcome Banner (on the ADVANCED > Email Protocol page)
Web Interface HTTP Port (on the BASIC > Administration page)
Web Interface HTTPS/SSL port (on the ADVANCED > Secure Administration page)
Any other secure administration configuration, including saved certificates (on the
ADVANCED > Secure Administration page)
Quarantine Host (on the BASIC > Quarantine page)
All SSL/TLS information, including saved certificates (on the ADVANCED > SMTP/TLS
page)
Whether to only display local messages in the message log (Only view local messages on
the BASIC > Message Log > Preferences page)
Whether the latest release notes have been read
All customized branding (Barracuda Spam & Virus Firewall 600 and above, on the
ADVANCED > Advanced Appearance page)
The Explicit Accepted Users list, if enabled and used, on the ADVANCED > Explicit
Users page. This is a global setting.
The Valid Recipients list on the DOMAINS > Manage Domain > USERS > Valid
Recipients page. This is a per-domain setting.
Advanced Configuration 69
Advanced Networking
Port Forwarding
If your organization has a single public IP address, when you install the Barracuda Spam & Virus
Firewall between the Internet and your mail server, you can forward incoming SMTP traffic (port 25)
from port 80 on the Barracuda to your mail server using the Port Forwarding feature from the
ADVANCED > Advanced Networking page.
Configuring the Network Interfaces
With the Barracuda Spam & Virus Firewall model 600 and above, you can configure each of the two
Ethernet (NICS) interfaces directly from the ADVANCED > Advanced Networking page to accept
email on both interfaces or to route ingress email to one NIC and egress through the other NIC.
Benefits of this feature include redundancy, filtering email for domains on separate networks and
improving throughput. Up to 250 IP addresses can be configured per NIC.
Static Routes
You can specify a default gateway between the Barracuda Spam & Virus Firewall and a mail server
on another subnet in your organization using the Static Routes feature on the ADVANCED >
Advanced Networking page. This will guarantee that return traffic is routed back to the Barracuda
Spam & Virus Firewall from the unassociated network.
Loopback Adapter
If you want to use this Barracuda Spam & Virus Firewall with a Barracuda Load Balancer in Direct
Server Return mode, you must enable a non-ARPing loopback adapter. If you are using any other
mode you do not need to make any changes to the Barracuda Spam & Virus Firewall configuration.
Each Virtual IP address supported by the Real Server (the Barracuda Spam & Virus Firewall in this
case) requires its own loopback adapter. For each loopback adapter, enter a Virtual IP address in the
Loopback Adapter Configuration field on the ADVANCED > Advanced Networking page.
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Non-Delivery Reports (NDRs)
Spam Bounce Non-Delivery Reports (NDRs)
The Barracuda Spam & Virus Firewall sends NDRs to email recipients and senders when one of their
messages is blocked. The NDR contains a brief explanation of why the Barracuda Spam & Virus
Firewall blocked the message. Information that you may want to add to an NDR includes the contact
information of the Barracuda Spam & Virus Firewall administrator so that internal users know who
to contact if they have questions about a blocked message.
The ADVANCED > Bounce/NDR Messages page allows for modifying the information in an NDR and
for selecting the default language to use in the message.
Reducing Backscatter
By default, your Barracuda Spam & Virus Firewall is configured to NOT send an NDR to a sender
when the Barracuda Spam & Virus Firewall blocks their email. You may want to enable NDRs to alert
legitimate senders that their message has not been delivered to the recipient.
However, if the email came from an illegitimate source such as a spammer, then sending a bounce
notification is not necessary. Additionally, many spammers spoof valid domains, and you don’t want
to send bounce messages to your domain if it is being spoofed. Sending bounce messages to
illegitimate senders is known as “backscatter”.
Backscatter can increase the load on your Barracuda Spam & Virus Firewall and may generate a lot
of email to fake addresses. Additionally your domain could end up on a real-time blacklist as a
consequence. If your Barracuda Spam & Virus Firewall rarely blocks a legitimate email, consider
turning off bounce notifications to reduce backscatter by setting the Send Bounce feature on the
ADVANCED > Bounce/NDR Settings page to No.
Advanced Configuration 71
Remote Administration
Barracuda Networks provides a set of APIs for remote administration and configuration of the
Barracuda Spam & Virus Firewall, firmware version 4.x. The APIs work through manipulation of
variables inside of the system configuration database, and anything that can be declared in that
database can be set or checked with the APIs. This includes most things that you can set by clicking
the Save Changes button in the Barracuda Spam & Virus Firewall Web interface. For example, from
the BASIC > Spam Checking page, you can set global Spam Scoring Limit values for the actions
Block, Tag or Quarantine, then click the Save Changes button. These values can be set remotely
using the APIs.
The framework of the API provides for the programmer to get or set variables inside an XML-RPC
request that correspond to field values in the configuration database in the Barracuda Spam & Virus
Firewall. Some languages such as Perl, for example, provide wrappers for XML-RPC requests,
providing an interface to form the request. To view the variables and current settings of the Barracuda
Spam & Firewall configuration database, on the ADVANCED > Backup page, select System
Configuration for Backup Type and click the Backup button.
To prepare the Barracuda Spam & Virus Firewall for use with the APIs, you must first enter the IP
addresses that are allowed to communicate with the APIs in the Allowed SNMP and API IP/Range
field on the BASIC > Administration page, and you must create an API Password that will be
included with all calls to the APIs.
For more information on using the APIs, see the Barracuda Spam & Virus Firewall API Guide 4.x
on the Barracuda Web site: http://www.barracuda.com/support.
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Chapter 7
Managing Quarantine
The Barracuda Spam & Virus Firewall provides a fully featured, robust quarantine function to apply
at either a global level or at a per-user level, configurable for each domain managed by the appliance.
This chapter covers some pros and cons of enabling quarantine and how and why to use global or peruser quarantine.
How Quarantine Works...................................................................... 74
Quarantine Options ........................................................................... 75
Global Quarantine ............................................................................. 76
Per-User Quarantine ......................................................................... 77
Managing Quarantine 73
How Quarantine Works
After a message travels through the initial filtering layers of the Barracuda Spam & Virus Firewall, it
is assigned a score based on the probability that it is spam. The administrator can decide how to deal
with messages based on the Spam Scoring levels (from 0 to 10): allow, tag, quarantine or block, as
set on the BASIC > Spam Checking page.
•
•
•
Tagging the message means the user will receive the message in their regular mailbox with the
subject text modified to indicate that the message might be spam.
Quarantining the message means that the message will either be delivered, with the subject text
modified to indicate that the message might be spam, to a special “quarantine inbox” assigned to
a user or to a “global” quarantine mailbox designated by the administrator.
Blocking the message means it will not be delivered.
Messages can also be determined to be quarantined (as opposed to allowed, blocked or tagged) by
custom policies you set based on domain name, IP address, region, content filters and other filtering
tools in the BLOCK/ACCEPT pages. Spam Scoring settings can be further refined at the domain level
and/or per-user level, depending on what the administrator enables on the USERS > User Features
page at the global level and what the Domain Admin role enables on the USERS > User Features page
at the domain level. For more information on the Domain Admin and other account roles, please see
Role-based Administration, page 87.
Quarantine can be enabled or disabled completely. If it is enabled at the Global level, no messages
are stored on the Barracuda Spam & Virus Firewall. If it is enabled at the Per-User level, accounts
are created for users listed in the authentication server (see Automatic Account Creation, page 84) or
in the local database on the Barracuda Spam & Virus Firewall.Quarantined messages stored in the
users’ quarantine inboxes need to be delivered to their regular email inbox or deleted. As the
administrator, you can configure Retention Policy to limit the amount of disk space used for storing
each user's quarantined messages, thereby conserving system resources on the Barracuda Spam &
Virus Firewall. Messages can be scheduled for regular purging based on age and/or size (see
Retention Policy and Purging Old Messages, page 80).
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Quarantine Options
By default, the Barracuda Spam & Virus Firewall does not quarantine incoming messages, but you
may want to enable quarantine if, for example, your organization requires it, or if you want to reduce
load on the mail server while giving users a chance to determine what they consider to be “spam” or
“not spam”. Message retention can be set by maximum message age and/or size for per-user
quarantine.
The three options available for configuring quarantine with the Barracuda Spam & Virus Firewall and
the pros and cons of each are described below.
Turning Quarantine Off
Barracuda Networks recommends disabling quarantine unless, for example, your organization has a
business requirement to provide quarantine of messages suspected to be spam or you don’t want those
messages stored on the mail server. Disabling quarantine means less management either by the
administrator or by the user and, in the case of per-user quarantine, saves system resources that would
otherwise be used to store the messages until the user delivers or deletes them.
An alternative to using quarantine is tagging email that may be spam based on scoring or are
otherwise identified as possible spam. Benefits include:
• No messages are stored on the Barracuda Spam & Virus Firewall, thus saving system
resources
• The user doesn’t have an extra quarantine inbox to manage
• Tagged messages, with a keyword such as “[BULK]” prepended to the subject line, can
be filtered by the subject line to a separate folder for later examination by the user (see
the BASIC > Spam Checking page and the BLOCK/ACCEPT pages to configure spam
scoring and criteria for tagging messages).
To disable Quarantine completely, check the Disable check box next to “Quarantine” in the Spam
Scoring Limits section of the BASIC > Spam Checking page.
Using Global Quarantine
With global quarantine there is almost no difference in use of system resources versus having
quarantine turned off because messages aren’t stored on the Barracuda Spam & Virus Firewall; they
are forwarded to a mailbox as designated by the administrator. Global quarantine identifies email to
quarantine, rewrites the “From” address of the message and sends it to the Quarantine Delivery
Address specified on the BASIC > Quarantine page. The subject line of each message is prepended
with the Quarantine Subject Text (for example, [QUAR]) as specified on the same page). Global
quarantine does require some time and effort by the administrator to tune.
Using Per-user Quarantine
Providing a user with a quarantine inbox gives them greater control over how their messages are
quarantined, but also requires them to manage their quarantine inbox on the Barracuda Spam & Virus
Firewall. Since per-user quarantine entails storing quarantined messages on the Barracuda Spam &
Virus Firewall until the user delivers or deletes, them, you may want to only provide a quarantine
inbox to a subset of power users.
Managing Quarantine 75
Global Quarantine
Enabling global quarantine on the Barracuda Spam & Virus Firewall provides the administrator with
complete control over how quarantined messages are handled, and it saves system resources because
messages are not stored on the appliance.
To set up global quarantine, from the BASIC > Spam Checking page, make sure that the Disable
check box next to Quarantine in the Spam Scoring Limits section is NOT checked. From the BASIC
> Quarantine page, select the Quarantine Type to Global and configure settings as described below
for Global Quarantine.
You’ll need to enter a Quarantine Delivery Address: on the BASIC > Quarantine page.This mailbox
can either be on the mail server that the Barracuda Spam & Virus Firewall protects or a remote mail
server. Note: If you have a Barracuda Spam & Virus Firewall model 400 or above, you can specify
the quarantine delivery address on a per-domain basis by going to the DOMAINS tab and clicking the
Manage Domains link, then using the BASIC > Quarantine page for that domain to configure the
address.
Messages determined to be quarantined by the Barracuda Spam & Virus Firewall will have the subject
line prepended by the Quarantine Subject Text: as entered on the BASIC > Quarantine page. The
default text is [QUAR]. This allows you to identify quarantined messages when you have them
delivered to a mailbox that also receives non-quarantine messages.
Note that with global quarantine, users will have no control over whitelisting or blacklisting of email
addresses, which they do have with per-user quarantine. Allowing them this control by using per-user
quarantine can help reduce the number of messages processed by the Barracuda Spam & Virus
Firewall. However, if using global quarantine, users can communicate domains, IP addresses or email
addresses that should be white or blacklisted to the administrator to configure at the global level.
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Per-User Quarantine
When enabling per-user quarantine on the Barracuda Spam & Virus Firewall, keep in mind that
quarantined email stored on the Barracuda Spam & Virus Firewall requires storage capacity, so
system load will vary with the average size of emails.
If the email patterns of your organization are such that many emails include large attachments (as with
architecture firms, marketing firms, etc.), the system may push the edge of performance more quickly
than if emails tend to be small in size. See the Mail/Log Storage indicator in the Performance
Statistics pane of the BASIC > Status page to monitor disk storage on the Barracuda Spam & Virus
Firewall.
To set up per-user quarantine, the first thing to do is to enable quarantine using the Spam Scoring
Limits on the BASIC> Spam Checking page. On the BASIC > Quarantine page, select the Quarantine
Type to be Per-User and configure settings as described below for Global Quarantine. If Per-User
quarantine is set by the administrator or the Domain Admin can either enable or disable Per-User
quarantine at the domain level.
You can choose to allow the user to decide whether to deliver quarantined messages to their regular
email address associated with their account or to their quarantine inbox. You can alternatively decide
this for the user and prevent them from accessing this setting. You can also allow the user to control
their whitelist (allowed) and blacklist (blocked) of email addresses.
Note
For the Barracuda Spam & Virus Firewall 300 and higher, be sure to set a Retention Policy before
enabling per-user quarantine in order to prevent running out of quarantine space.
Where Do the Quarantined Messages Go?
If the administrator sets Quarantine Type to Per-User on the BASIC > Quarantine page and the New
User Quarantine State feature is set to On, the Barracuda Spam & Virus Firewall will automatically
create quarantine accounts for all users listed in the authentication server or local database as
configured at the domain level. Account holders can the log into the Barracuda Spam & Virus
Firewall and view their Quarantine Inbox to view and take actions with quarantined messages.
If a user's quarantine inbox is disabled (by an administrator or a Domain Admin or Helpdesk account,
or by the user), emails sent to that user that would normally have been placed in quarantine will simply
be delivered to the user's regular mailbox with the subject line prepended with a quarantine tag.
Linking Domains for One Quarantine Inbox
In some cases it may be practical to direct all quarantined email to one quarantine inbox on the
Barracuda Spam & Virus Firewall. You may employ one or more “power users” to manage it, or
allow all users to log in to the same inbox.
Using only one quarantine inbox for all users greatly simplifies management of per-user quarantine
because you only have to configure user features (from the BASIC > User Features page) for ONE
inbox. The Linking Domains feature, configurable on the BASIC > Quarantine page, allows the
option for all domains protected by this Barracuda Spam & Virus Firewall be treated as if they were
alternate names for the default domain name for the system. So, for example, if the Default Domain
for the system as specified on the BASIC > IP Configuration page is mybarracuda.com, then
Managing Quarantine 77
user@domain1.com will be treated as user@mybarracuda.com when determining user validity and
preferences, and will have a quarantine inbox under the name user@mybarracuda.com.
Domain Level Settings
Some settings are only configurable at the domain level.The Domain Admin role or the administrator
can also override some global settings for spam and virus checking and quarantine at the domain
level. These settings include:
• Enabling spam scanning and setting spam score limits for the domain
• Enabling or disabling virus scanning
• Enabling per-user quarantine and user features (see Controlling Access to Account
Features, page 78)
• Set the destination mail server for the domain
• Single Sign-On authentication
• LDAP authentication
• Local database of valid recipients (if not using LDAP) and alias linking
See the DOMAINS page and click Manage Domain for a specific domain to access pages for these
settings.
The Quarantine Inbox
When an account holder with the User role logs in to the Barracuda Spam & Virus Firewall they’ll
see the QUARANTINE INBOX and PREFERENCES tabs. They can view and choose to , deliver or
delete quarantined emails from the QUARANTINE INBOX page and configure their account settings
from the PREFERENCES page to the extent that their account permissions allow as described below
under Controlling Access to Account Features, page 78.
Domain Admin and Helpdesk account holders will see the QUARANTINE INBOX and PREFERENCES
tabs when they click the Manage Account link in the breadcrumbs in the upper-right corner of the
Web interface.
For details on how all account holders manage their quarantine inbox, please see the Barracuda Spam
& Virus Firewall User's Guide at http://www.barracudanetworks.com/documentation.
Alias Linking
This feature allows one quarantine account to receive quarantined email for multiple accounts, using
the Explicit Accepted Users section of the USERS > Valid Recipients page. Note that this account, if
entered on one line only with associated accounts for which it should receive email, is not considered
a Valid Recipient. This account needs to be added on a separate line to also be considered a Valid
Recipient. The quarantine account that receives quarantined email for other accounts does not need
to belong to the same domain as the others.
Controlling Access to Account Features
When accounts are created by the Barracuda Spam & Virus Firewall, permissions are automatically
assigned for users to manage their account features based on what is configured on the USERS > User
Features page in the Default User Features section. Domain Admin roles can further limit user
access to these features based on what the administrator has enabled at the global level.
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For example, if the Whitelist/Blacklist feature is set to No (disabled) at the global level in the Default
User Features section of the USERS > User Features page, the Domain Admin role will not see or be
able to control that setting for accounts in domains that they manage.
Configurable user account features include:
•
•
•
•
•
•
Quarantine Inbox - allow the account holder to enable their quarantine inbox on the Barracuda
Spam & Virus Firewall, or disable it such that quarantined message go to their regular email
inbox.
Spam scanning - allow the account holder to enable or disable
Edit frequency at which quarantine notifications are sent to the account holder
Add addresses and domains to a whitelist or blacklist
Use Bayesian filtering
Allow account holder to set their own tag, quarantine and block levels according to spam
scoring
If allowed permissions by the administrator, the Domain Admin can edit the Default User Features
settings (i.e. disabling certain features that were enabled at the global level by the administrator) at
the domain level for account holders in the domain. The Helpdesk role does not have this permission.
Overriding Default Account Features Settings
The User Features Override section of the USERS > User Features page allows you to make
exceptions to the rules specified above for particular account holders. Domain Admin and Helpdesk
roles can view and set override of user feature defaults ONLY for features that are enabled in the
Default User Features section by the administrator. Consequently, nothing will appear on the
USERS > User Features page for Domain Admin and Helpdesk roles if all Default User Features
options have been set to No by the administrator.
User overrides only apply when the domain level setting in Default User Features matches the global
setting.
Assigning Quarantine Inbox Permissions to Selected Users
One of the most common scenarios for overriding quarantine settings is when you want to provide a
few “power users” with a quarantine inbox on the Barracuda Spam & Virus Firewall and have the rest
of your users receive quarantine messages in their standard email inbox. Providing a user with a
quarantine inbox gives them greater control over how their messages are quarantined, but also
requires them to manage their quarantine queue. For this reason, you may only want to provide a
quarantine inbox to a subset of sophisticated users. In this example, you would do the following:
•
•
•
•
Set the quarantine type to Per-user on the BASIC > Quarantine page.
Set the New User Quarantine State: to Off so that accounts are not automatically created by
the Barracuda Spam & Virus Firewall when needed (for conditions under which new accounts
can be automatically created, see Automatic Account Creation, page 84).
In the User Account text box in the User Account Create/Update section of the USERS > User
Add/Update page, enter the email addresses of the users you for whom you want to create a
quarantine inbox and set Enable User(s) Quarantine to Yes in the same section.
Enable the features you want those account holders to be able to manage for their accounts on
the USERS > User Features page.
Managing Quarantine 79
•
Note
Set the Email New User(s):option to Yes to email login information to the new users.
If you enable user quarantine, you should remove any mailing lists you may have added on the
ADVANCED > Explicit Users page and public folders so no per-user accounts are created based
on those email addresses.
Quarantine Notifications
The Barracuda Spam & Virus Firewall can send notifications of quarantined messages to account
holders at predefined intervals and in selected languages. The notification interval and email address
can be set at the global level on the BASIC > Quarantine page and overridden at the domain level if
allowed by the administrator. Because creating a quarantine digest for each user requires lots of
system I/O, it is recommended to set the Notification Start Time on the BASIC > Quarantine page
to outside of peak traffic time frames during the weekday. The default start time is 3:35pm (15:35) as
such. Users can override the Notification Interval of daily, weekly or never from their
PREFERENCES tab if enabled by the administrator.
It is a recommended to set the Quarantine Host value, which appears as the sending hostname in all
quarantine and welcome emails from the system. Using this hostname as opposed to the system IP
address (default) ensures that users are able to reach the Barracuda Spam & Virus Firewall from their
old notifications even after any possible changes in IP addresses.
At the domain level, to enable users (including Domain Admin, Helpdesk and User roles) to manage
quarantine notifications for their own accounts, make sure the Enable User Features setting on the
BASIC > Quarantine page is turned On. Account holders can then access notification settings from
their PREFERENCES > Quarantine page, overriding the global setting. The Default Language used
in notification emails can also be set from this page.
Note
If you enable quarantine notifications, be sure to open port 8000 on your firewall (or whatever port
you are using for the Web interface) if you want the Barracuda Spam & Virus Firewall to send
quarantine notifications outside of the network.
Retention Policy and Purging Old Messages
As the administrator, you can configure retention policy to limit the amount of disk space used for
storing each user's quarantined messages, thereby conserving system resources on the Barracuda
Spam & Virus Firewall.
From the USERS > Retention Policies page, you can enable the user to easily schedule quarantined
messages for regular purging based on age (in number of days), disk space used (specified in
kilobytes), or both. Setting the Age Limit to a 7-14 day range is recommended assuming that older
quarantined emails may lose importance with time.
Note that regardless of these settings, no messages younger than 3 days will be removed. For example,
if the maximum size limit on email size is 10MB and a quarantined email has a 19MB attachment,
the email will be retained for 3 days, giving the user time to examine and process that email before it
is automatically deleted by the Barracuda Spam & Virus Firewall.
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Minimizing Excessive Storage of Email
It is recommended that users be trained to manage their own quarantine areas, since constant reliance
on the Barracuda Spam & Virus Firewall to automatically remove quarantined messages based on
either age or disk usage may impact system performance.
The level at which performance is affected depends on the number of user quarantine areas that are
kept on the Barracuda, the amount of email that is quarantined each day, and the number of tasks the
system performs (e.g., reporting, or body filtering).
Use the filters on the USERS > Account View page to quickly determine which users have the largest
quarantine areas. Each account entry shows Yes/No in the Quarantine column (“Yes” indicates peruser quarantine is in effect for that user) and number of Kbytes of email stored in their quarantine
inbox in the Size column. Individual user quarantine areas can be disabled from the USERS >
Add/Update page so that any repeat offenders can be prevented from utilizing the Barracuda Spam &
Virus Firewall quarantine areas. When a user's quarantine is disabled, emails sent to that user that
would normally have been placed in quarantine will simply be delivered to the user's actual mailbox
with the subject line prepended with a quarantine tag.
Note
When you enable retention policies, keep in mind that if your system has been accumulating email
without retention policies for a period of time, the first day retention policies are enabled results in
an impact on system performance. The longer a system runs without retention policies, the larger
the performance impact. After the first day or two, the load stabilizes as the system is able to keep
large quarantine fluctuations to a minimum. Retention policies are run daily starting at
approximately 02:30 AM.
Managing Quarantine 81
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Chapter 8
Managing Accounts and Domains
If your Barracuda Spam & Virus Firewall is responsible for filtering messages for more than one mail
server or domain, the domains associated with each mail server will need to be added to the system.
With the Barracuda Spam & Virus Firewall model 400 or higher, you can also set spam scoring,
quarantine type, sender spoof protection and spam/virus checking on a per-domain basis. If per-user
quarantine is enabled, the Barracuda Spam & Virus Firewall will create user accounts to enable access
to quarantine settings and messages. The Barracuda Spam & Virus Firewall 600 and higher also
supports per-user account spam score settings.
Use this chapter to understand managing user accounts and domains on the Barracuda Spam & Virus
Firewall and configuring per-domain and per-user settings.
Creating and Managing Accounts ..................................................... 84
Role-based Administration................................................................. 87
Creating and Managing Domains...................................................... 95
Managing Accounts and Domains 83
Creating and Managing Accounts
There are two ways of creating user accounts on the Barracuda Spam & Virus Firewall - automatically
and manually. Depending on how the administrator configures the Barracuda Spam & Virus Firewall,
accounts can include quarantine inboxes for individuals or not. If, for example, users don’t want to
have to manage a quarantine inbox in addition to their regular mailbox, accounts can be configured
to only provide users with the ability to manage their own whitelists and blacklists of email addresses
and domains, or to specify their own spam scoring levels.
In addition to the administrator account role, which includes permissions to configure all settings on
the Barracuda Spam & Virus Firewall, three other account roles with associated levels of permissions
are available: User, the default account role which has the most restricted permissions, Helpdesk
(available on the Barracuda Spam & Virus Firewall 300 and higher), with increased permissions, and
Domain Admin (available on the Barracuda Spam & Virus Firewall 600 and higher), the role with the
most permissions other than the administrator. Thus you can delegate various levels of authority to
members of your organization for administering quarantine accounts and managing domain-level
settings on the Barracuda Spam & Virus Firewall.
Once accounts are created, each account can be assigned a role other than the default User role from
the USERS > Account View page at the global level or at the per-domain level. This feature is
especially useful for ISPs/Web hosting providers to give helpdesk and more sophisticated technical
support personnel access to domain and per-user account configuration for groups of users. See Rolebased Administration, page 87, for details on role-based permissions and Web interface navigation.
Automatic Account Creation
The Barracuda Spam & Virus Firewall automatically creates accounts when all of the following
conditions are met:
•
•
•
The New User Quarantine State feature is set to On in the BASIC > Quarantine page:
The administrator enables quarantine and sets quarantine type to per-user on the BASIC >
Quarantine page. For more information on enabling quarantine, refer to Managing Quarantine,
page 73.
The Barracuda Spam & Virus Firewall receives an email that needs to be quarantined, which
triggers creation of the account.
The Barracuda Spam & Virus Firewall automatic account creation process is as follows:
84
1.
Checks the recipient email address against the Local database or the LDAP server as specified
at the per-domain level on the USERS > Single Sign-On page (Barracuda Spam & Virus Firewall
400 and higher), as well as the Explicit Accepted Users text box on the USERS > Valid
Recipients page. To increase security, you can configure the Barracuda Spam & Virus Firewall
to validate the receiving email address (using LDAP or the SMTP command RCPT TO) before
it creates an account. This helps prevent the Barracuda Spam & Virus Firewall from creating
accounts for invalid users.
2.
Creates a new account with User level permissions (See Role-based Administration, page 87 for
more information about account roles and permissions) for the recipient if the address does not
exist. The Barracuda Spam & Virus Firewall uses the email address of the recipient as the
username of the account and auto-generates a password.
3.
If Single Sign-On is not enabled, the Barracuda Spam & Virus Firewall sends the account
holder an email with the login information so they can access their quarantine inbox. With
Single Sign-On enabled, the account holder will be able to log into the Barracuda Spam & Virus
Firewall with their regular network credentials.
Barracuda Spam & Virus Firewall Administrator’s Guide
Note
4.
Places the quarantined message in the account holders’s quarantine inbox.
5.
Sends a quarantine summary report to the account holder.
The settings chosen in the Default User Features section of the USERS > User Features page are
applied to all new accounts that are created.
When to Disable Automatic Creation of Accounts
If your LDAP server is running slowly, email will still be processed by the Barracuda Spam & Virus
Firewall but unavailability of your LDAP server could result in creation of invalid quarantine
accounts for unverified users on the Barracuda Spam & Virus Firewall. In this case it may be
preferable to disable automatic account creation by setting the New User Quarantine State to Off
from the BASIC > Quarantine page. User accounts can be manually created in bulk as described
below.
Another reason to disable automatic creation of accounts is that you may not want all of your users to
have quarantine inboxes to manage, access to whitelist/blacklist capabilities, etc. In that case, you can
manually create user accounts for those individuals for whom it is appropriate, as described in the next
section.
Manually Creating User Accounts
In addition to the two cases mentioned above, you will want to manually create user accounts with
the USERS > User Add/Update page when you want to override the default quarantine, virus and spam
checking settings for specific account holders. Creating the account before the Barracuda Spam &
Virus Firewall automatically creates it enables you to initially configure the account settings if they
are different from the default settings for other users.
The Barracuda Spam & Virus Firewall allows for account holders to manage various aspects of spam
and virus checking and whitelist/blacklist behavior for their email without having to have a quarantine
inbox on the appliance. By doing this you can enable global quarantine, but create per-user settings
for user control of spam and virus checking features.
For example, if you want your users to be able to maintain their own whitelists and blacklists of email
addresses and domains, but you don’t want to use resources on the Barracuda Spam & Virus Firewall
to store quarantine messages, or you don’t want to have to train or depend on users to manage their
quarantine inboxes, you can easily create accounts from the USERS > User Add/Update page for one
or more users and disable their quarantine inbox(es). Then, on the USERS > User Features page,
enable the features over which you want those users to have control by entering the same list of new
account names (email addresses) in the User Account(s): text box in the User Features Override
section of the page.
Account Creation by Users
Another way to manually create accounts on the Barracuda Spam & Virus Firewall is to use the
Create New Password button on the login page which new users can click to create an account with
their email address as their username. Their password will be emailed to the email address they enter
in the username field.
Managing Accounts and Domains 85
Single Sign-On and User Authentication
Single Sign-On is a per-domain setting on the Barracuda Spam & Firewall, and if Single Sign-On is
enabled for a particular domain, account holders associated with that domain can log into the Web
interface of the Barracuda Spam & Virus Firewall with their regular network credentials to manage
their accounts.
If enabling Single Sign-On for a domain, you should also configure HTTPS/SSL Access Only at the
global level on the ADVANCED > Secure Administration page to protect the transmission of network
passwords. See Enabling SSL for Administrators and Users, page 38 to configure SSL on the
Barracuda Spam & Virus Firewall 400 and higher.
Assigning Features to User Accounts
The USERS > User Features page enables the administrator to enable or disable user control over their
account settings:
• For newly created accounts, in the Default User Features section of the page
• For existing accounts, in the User Features Override section of the page
These features provide the user’s ability to enable or disable the following:
• Whitelist/blacklist of email addresses and domains
• Quarantine inbox
• Notification settings - email address for receiving a quarantine summary report, and
notification intervals
• Use of a personal Bayesian database
• Spam scanning (on/off)
• Setting spam tag, quarantine and block score levels (Barracuda Spam & Virus Firewall
600 and higher)
For all of the user features enabled by the administrator, the Domain Admin account role can override
the global setting and disable any Default User Features for newly created accounts. BOTH the
Domain Admin and Helpdesk account roles can override the global settings for existing accounts in
the User Features Override section of the USERS > User Features page on a per-domain basis.
To enable account holders (including Domain Admin, Helpdesk and User roles) to edit
preferences/user features for their accounts, make sure that the Enable User Features setting on the
BASIC > Quarantine page is turned On.
One of the most common scenarios for overriding quarantine settings is when you want to provide a
few “power”users with a quarantine inbox on the Barracuda Spam & Virus Firewall, with the rest of
your users receiving quarantined messages in their standard email inbox. Those quarantined messages
will have a tag prepended to the subject line indicating that the Barracuda Spam & Virus Firewall
suspects the message to be spam. See How Quarantine Works, page 74 for more information.
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Role-based Administration
Roles and Navigating the Web Interface
Depending on the role of the logged in account, the “breadcrumbs” in the upper right corner of the
Web interface will indicate the login name as well as either global scope navigation, domain scope or
account scope. The administrator can step into the domain level scope of the Web interface, which is
what the Domain Admin and Helpdesk roles will see, from the DOMAINS page, by selecting a domain
to manage. The DOMAINS page represents the “top level” of navigation of the Web interface for
Domain Admin and Helpdesk roles, as shown in Figure 8.1.
Figure 8.1: The DOMAINS page as viewed by the Domain Admin or Helpdesk roles upon login.
Clicking on Manage Domain enables managing domain-level settings and user accounts for that
domain. From the domain level of the Web interface, the Domain Admin or Helpdesk role can “drill
down” another level by selecting an account associated with that domain to edit from the USERS >
Account View page (see Figure 8.2). Editing an account displays the quarantine inbox and
preferences for the account, which is what the User role sees. Domain Admin and Helpdesk roles can
also edit their own personal account settings and quarantine inboxes.
Managing Accounts and Domains 87
Figure 8.2: Drilling down from the DOMAINS page to account level
Figure 8.3: Breadcrumbs enable Domain Admin role to return to DOMAINS page or edit account
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Editing Accounts and Assigning Roles
From the USERS > Account View page in the global scope, the administrator can manage accounts
for all domains on the Barracuda Spam & Virus Firewall, editing account roles, deleting invalid
accounts as needed and changing account passwords. The USERS > Account View page displays role
types and whether or not each account has quarantine enabled. Role permissions are described in the
next section.
Figure 8.4: Account View from global scope as seen by the administrator.
Note that “breadcrumbs” in the upper right of the page always indicate the login name of the current
account holder, the Log Off link and, if applicable, links to the section of the Web interface from
which the account holder navigated.
Clicking Edit Role brings up the Edit Role page, as shown in Figure 8.5 for changing the account role
from User (the default) to Helpdesk or Domain Admin and assigning domains for Helpdesk and
Domain Admin account holders to manage.
To grant a Helpdesk or Domain Admin role permissions to manage ALL domains configured on the
Barracuda Spam & Virus Firewall, put the phrase "all_domains" in the Managed domains for: text
box on the Edit Role page for that account as shown in Figure 8.6 instead of listing individual domains
to manage.
Figure 8.5: The Edit Role page for assigning roles and domains to manage.
Managing Accounts and Domains 89
Figure 8.6: Assigning all_domains permissions on the Edit Role page.
User Role
This is the default role assigned to newly created accounts and only provides the account holder with
a view of their quarantine inbox and some account preference settings, depending on what has been
enabled for their account. Permissions may include:
•
•
•
•
•
Modify individual settings for quarantine, spam tag, quarantine and block levels.
Management of quarantine inbox - deliver, whitelist, delete quarantined messages.
Change password (if Single Sign-On authentication is not configured).
Create whitelists and blacklists for email addresses and domains.
Manage a personal Bayesian database.
If granted the permission, the User role can disable quarantine for their account such that all messages
quarantined for that account holder’s email address(es) by the Barracuda Spam & Virus Firewall will
be delivered to their regular email inbox. The User account holder will see the following page upon
login, with option to set preferences (see Assigning Features to User Accounts, page 86) and manage
their quarantine inbox of messages. See also Per-User Quarantine, page 77.
Figure 8.7: User role view of Web interface, displaying the Quarantine inbox
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Helpdesk Role
This role is available for the Barracuda Spam & Virus Firewall 300 and higher and can manage basic
account settings for accounts associated with one or more domains and assist users with managing
their quarantine inboxes. This role has the User level permissions plus the ability to:
• Override account settings for existing accounts for the domain(s) the Helpdesk account
holder has permissions to manage. The administrator can enable the Helpdesk role to
expand or limit user control over their spam scoring, whitelist/blacklist, quarantine
enable/disable, notification and Bayesian filtering settings.
• View the Message Log for the domain(s) managed and deliver quarantined messages.
The Helpdesk role cannot, however, view the body of messages in the Message Log.
• Log into an account with lesser permissions and manage the associated quarantine inbox
- deliver, whitelist or delete messages.
• View domain-level status and reports (with the exception of the daily Traffic Summary,
which can only be generated at the global level by the administrator).
• Edit account roles for account holders with lesser permissions.
Helpdesk Role - All_Domains Permissions
The Helpdesk role has the above permissions for ALL domains configured on the Barracuda Spam &
Virus Firewall if the Managed domains for: text box on the USERS > Account View > Edit Role page
for this account holder includes the phrase "all_domains" (see Figure 8.6).
A Helpdesk account holder with all_domains permission can also do the following:
• Change the role of a Helpdesk account holder (to the User role) who does not have
all_domains permissions.
• Log into and manage the quarantine inbox of a Helpdesk or a Domain Admin who does
not have all_domains permissions
If the Helpdesk account holder only administers a subset of all domains configured on the Barracuda
Spam & Virus Firewall, only those domains will appear in the DOMAINS page. Here, the Helpdesk
account only administers two domains:
Figure 8.8: A Helpdesk account holder sees a list of only domains they manage
Clicking on the Manage Domain link will show a subset of the Web interface. The Helpdesk role
sees basic email statistics, can view reports and the Message Log for the selected domain and manage
the quarantine inbox and settings for other account holders, depending on their permissions level.
Managing Accounts and Domains 91
Figure 8.9: A Helpdesk account holder has a limited view of per-domain data and accounts
From the USERS > Account View page, the Helpdesk account holder can view and edit accounts
and quarantine inboxes for the domain or manage their own account.
Figure 8.10: On the USERS > Account View page, the Helpdesk role sees a list of the accounts
associated with the domain
For any account holders listed for the domain, the Helpdesk account holder can manage the quarantine
inbox and some account settings, as described above.
Some Helpdesk Use Cases
• Disabling quarantine on the USERS > Add/Edit page for one or more users for reasons such as
the following:
• You don’t want to use Barracuda Spam & Virus Firewall resources to store quarantined
email, but you want your users to maintain their own whitelists and blacklists of email
addresses and domains.
• Users don’t want to maintain two inboxes, but want to control spam scoring and
quarantine notification intervals for their incoming email.
• A User account holder needs help changing their password.
• A user needs to know why email from a particular address is getting blocked by the Barracuda
Spam & Virus Firewall and the Helpdesk role can:
• View the reason for blocking on the BASIC > Message Log page.
• Deliver the message if necessary
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Domain Admin Role
The Domain Admin role is available on the Barracuda Spam & Firewall 600 and higher and can
manage various domain-level settings for authentication and secure communications as well as
account settings for account holders who have lesser permissions. This role includes Helpdesk level
permissions and use cases as described above plus the ability to:
• View the body of messages in the Message Log.
• Enable or disable per-user quarantine at the domain level and, if per-user quarantine is
disabled, specify a global quarantine email address for the domain.
• Enable or disable virus and/or spam scanning for the domain.
• Enable or disable various Default User Features for new accounts (see Controlling
Access to Account Features, page 78) and configure per-domain Single Sign-On, LDAP
and Valid Recipient (Explicit Accepted Users) settings.
• Specify a destination mail server and test the SMTP connection for a domain.
• Configure the option to require SMTP over a TLS connection for a domain.
• Enable rejecting email messages from the same domain name as the domain being
configured. This is to prevent spammers from spoofing the receiver’s domain name.
Domain Admin Role - All_Domains Permissions
The Domain Admin role has the above permissions for ALL domains configured on the Barracuda
Spam & Virus Firewall if the Managed domains for: text box on the USERS > Account View > Edit
Role page for this account holder includes the phrase "all_domains". In this case, all domains for
which the Barracuda Spam & Virus Firewall filters email will appear in the DOMAINS page.
A Domain Admin account holder with all_domains permission can also do the following:
• Change the role of a Domain Admin account holder who does not have all_domains
permissions.
• Log into and manage the quarantine inbox of a Domain Admin who does not have
all_domains permissions
Navigation of the Web interface for the Domain Admin role follows the examples illustrated above
for the Helpdesk role, plus the following.
Figure 8.11: The Domain Admin role can edit various domain-level settings
Managing Accounts and Domains 93
Figure 8.12: The Domain Admin role configures per-domain settings.
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Creating and Managing Domains
Adding and Deleting Domains
Your Barracuda Spam & Virus Firewall will only accept emails addressed to domains that it has been
configured to recognize. Settings for individual domains can be configured by the administrator and,
with some restrictions, by the Domain Admin and Helpdesk account roles as described above under
Role-based Administration, page 87. All three roles will see a DOMAINS tab from which they can click
Manage Domain next to the domain for which to edit the domain-level settings.
Only an administrator can add or delete domains using the controls available in the DOMAINS
page.The administrator can also add domains from the BASIC > IP Configuration page. Domains
added from either page will be initially configured with whatever you have specified your default
global settings to be.
If the administrator deletes a domain, all user accounts associated with that domain will also be
deleted from the Barracuda Spam & Virus Firewall. A confirmation dialog box will prompt you to
confirm whether or not you want to delete a domain.
Clicking the Manage Domain link for a particular domain will show the BASIC, USERS and,
depending on the permissions level of the logged in account role, the ADVANCED page for
configuring accounts and settings associated with the selected domain.
Figure 8.13: The administrator sees controls to add or delete domains or which to filter email
Note
Setting values on a per-domain basis overrides the values configured elsewhere in the Web
interface.
Managing Accounts and Domains 95
Domain Configuration
Basic configuration of a domain consists of identifying the name of the domain (and/or a specific subdomain) and specifying a destination mail server. Additional settings for a domain are dependent on
the model of your Barracuda Spam & Virus Firewall, and can include quarantine type, per-user
quarantine settings (if enabled), spam scoring levels, virus checking, sender spoof protection, SMTP
over TLS and per-user quarantine settings and retention policies.
Changing a Domain’s Settings
If you wish to change any setting for a domain that is configured for your Barracuda Spam & Virus
Firewall, you can do so from the DOMAINS > Domain Manager page by clicking on the Manage
Domain link for that domain. Domain Admin and Helpdesk roles have varying permissions in editing
domain settings as described in Role-based Administration, page 87.
Note that any changes you make to the global values of the Barracuda Spam & Virus Firewall will
NOT be inherited by the domains that you edit and for which you change configuration values.
Note
96
The Barracuda Spam & Virus Firewall 400 and higher contain support for APIs that can be used to
automate the steps for creating and configuring multiple domains on the Barracuda Spam & Virus
Firewall.
Barracuda Spam & Virus Firewall Administrator’s Guide
Chapter 9
Monitoring the System
This chapter describes the monitoring tasks you can perform from the Web interface and covers the
following topics:
Viewing Performance Statistics ......................................................... 98
Inbound and Outbound Message Queues .......................................... 98
Setting up Alerts .............................................................................. 100
Using the Task Manager to Monitor System Tasks.......................... 103
Using a Syslog Server to Centrally Monitor System Logs .............. 104
Front Panel Indicator Lights ........................................................... 105
Monitoring the System 97
Viewing Performance Statistics
The BASIC > Status page provides an overview of the health and performance of your Barracuda
Spam & Virus Firewall, including:
•
•
•
Hourly and daily email statistics that display the number of viruses blocked and messages
blocked, quarantined, and allowed for the last 24 hours and 25 days.
The subscription status of Energize Updates.
Performance statistics, including CPU temperature and system load. Performance statistics
displayed in red signify that the value exceeds the normal threshold. These values will fluctuate
based on the amount of traffic that is being handled, but if any setting remains consistently in the
red for a long period of time, please contact Technical Support.
If the Barracuda Spam & Virus Firewall performance decreases, the number of connections set for
Rate Control on the BLOCK/ACCEPT > Rate Control page can be used to reduce the rate of incoming
email to help investigate the reason. See the online BLOCK/ACCEPT > Rate Control help page in the
Web interface for more information.
If the Mail/Log Storage rises about 75%, this indicates that more disk space has been taken up by the
message and log storage than is allocated for that purpose and you should contact Technical Support.
If per-user quarantine is enabled and system performance has decreased, check the Quarantined
number of messages shown in the Email Statistics [inbound] pane on the BASIC > Status page. If this
number is high, changing the Retention Policies for per-user quarantine on the USERS > Retention
Policies page may solve the problem. See Retention Policy and Purging Old Messages on page 80 for
details and warnings about deleting large amounts of messages.
On models 600 and higher, if a disk drive in the RAID array exhibits a problem, the Redundancy
(RAID) indicator will highlight in red and show one of the drives as degraded with a link Click To
Repair. Clicking this link will display a pop-up indicating the drive to replace and an Ok button and
a Cancel button. You must first replace the disk drive that indicates a problem before proceeding with
the repair operation. Please contact Contacting Technical Support, page 16 if you need assistance.
Inbound and Outbound Message Queues
You can view the mail queues from the BASIC > Status page with the In/Out Queue Size. The
number of current inbound messages plus accepted messages waiting for virus and spam scanning is
shown, separated by a “/”, from the number of messages in the outbound queue waiting for the
outbound server. Click either number to view a summary of the messages currently in the queues.
Retrying Outbound Messages
If the outbound queue number is high, the mail server could be down or there could be another
network issue. Messages in the outbound queue will automatically expire if not successfully delivered
within 48 hours (default). This may happen normally if the destination mail server rejects email based
on mail server policy and the message is bounced back to the sender.
To requeue, or retry delivering email in the out queue, click the Retry button at the bottom of the
BASIC > Administration page to retry sending the messages immediately. The button will then be
disabled until the requeue process has completed.
Note that alerts and notifications are queued separately from email so that the administrator can
be alerted if the out message queue is high.
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The Message Log
The Message Log displays details about email traffic that passes through the Barracuda Spam & Virus
Firewall. Message source and analysis is viewable by clicking on a message, and includes spam
scoring and Bayesian analysis, if enabled.
This data is captured initially in the Mail Syslog and appears on the mail facility at the debug priority
level on the specified syslog server.
The Message Log is a window into how the current spam and virus settings are filtering email coming
through the Barracuda Spam & Virus Firewall, and sorting data using the wide variety of filters can
quickly provide a profile of email by allowed, tagged, quarantined or blocked messages by domain,
sender, recipient, time, subject, size, reason for action taken or score.
Watch the Message Log after making changes to the spam and virus settings to determine if the
Barracuda Spam & Virus Firewall spam checking and quarantine behavior is tuned per the needs of
your organization. See Monitor and Classify Incoming Emails on page 41 for more information about
using the Message Log.
Note
By default, Bayesian filtering is disabled on the Barracuda Spam & Virus Firewall. Buttons to mark
messages as out the Product Activation page, call your Barracuda Networks sales
representative.
Monitoring the System 99
Setting up Alerts
Setting up Emailed System Alerts
The BASIC > Administration page allows you to configure the Barracuda Spam & Virus Firewall to
automatically email notifications to the System Alerts Email Address you specify. To enter multiple
addresses, separate each address with a comma. These messages are queued separately from
outbound email.
System alerts notify you when:
•
•
•
Your Energize Update subscription is about to expire
New firmware updates are available
New security bulletins are available
Setting up SNMP Query and Alerts
While the Barracuda Spam & Virus Firewall will send email alerts to the email address specified on
the BASIC > Administration page as the System Alerts Email Address, these alerts are limited and
do not include latency, inqueue sizes, and other similar information. To monitor more specific
information on a Barracuda Spam & Virus Firewall, Barracuda Networks recommends using SNMP
monitoring with an SNMP server.
The Barracuda Spam & Virus Firewall 400 and higher offers the ability to monitor various settings
via SNMP, including:
•
•
•
System statistics, such as:
• inbound queue size
• outbound queue size
• average email latency
• cluster sync latency
• cluster queue size
• appliance uptime
The subscription status of Energize Updates and, if applicable, Instant Replacement and
Premium Support.
Performance statistics, including Mail/log storage, CPU temperature and system load.
To query the Barracuda Spam & Virus Firewall for these statistics via SNMP, you must first enter the
IP address of the server that will be making the SNMP connection in the Allowed SNMP and API
IP/Range section of the BASIC > Administration page. IP addresses entered in that field are allowed
to access the Barracuda via SNMP queries to retrieve error information, or via the API to configure
the device.
For details about configuring SNMP with the Barracuda Spam & Virus Firewall, see the technical
paper SNMP Monitoring for the Barracuda Spam & Virus Firewall 4.x at
http://www.barracudanetworks.com/documentation
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Monitoring the System 101
Reporting
Generating System Reports
The Barracuda Spam & Virus Firewall has a variety of system reports that can help you keep track of
such statistics as the top spam senders and the top viruses detected by the system.
You can either generate a system report on demand, or configure the system to automatically generate
the system reports on a daily basis. Reports can be created for data collected at the global level as well
as at the per-domain level.These settings are available on the ADVANCED > Reporting page.
Automating the Delivery of Daily System Reports
The Daily Report Email Options section lets you configure the Barracuda Spam & Virus Firewall to
automatically deliver daily system reports to specific users by entering their email addresses in the
field next to each report type.
You can enter as many email addresses as you like for each report as long as each address is separated
by a comma. If you do not want a daily report to be distributed, do not enter an email address next to
that report type.
Each report covers traffic for one day only. The Daily Traffic report is a good status reporting tool
and is only available to administrators. Having it emailed to your mail box every day is helpful for
monitoring the system.
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Using the Task Manager to Monitor System Tasks
The ADVANCED > Task Manager page provides a list of tasks that are in the process of being
performed and displays any errors encountered when performing these tasks. Some of the tasks that
the Barracuda Spam & Virus Firewall tracks include:
•
•
•
Clustered environment setup
Configuration and Bayesian data restoration
Removal of invalid users
If a task takes a long time to complete, you can click the Cancel link next to the task name and then
run the task at a later time when the system is less busy. The Task Errors section will list an error until
you manually remove it from the list. The errors are not automatically phased out over time.
Monitoring the System 103
Troubleshooting
Diagnostic Tools
Testing Network Connectivity
The Barracuda Spam & Virus Firewall Web interface provides a suite of tools to help diagnose
potential network problems, including ping, telnet, dig/NS-lookup, TCP dump and traceroute. See the
online help on the Network Connectivity Tests section of the ADVANCED > Troubleshooting page
for details about using these tools.
Connect to Barracuda Support Servers
In the Support Diagnostics section of the ADVANCED > Troubleshooting page, you can initiate a
connection between your Barracuda Spam & Virus Firewall to the Barracuda Networks Technical
Support Center which will allow technical support engineers to troubleshoot any issues you may be
experiencing.
you manually remove it from the list. The errors are not phased out over time.
Using a Syslog Server to Centrally Monitor System Logs
Use the ADVANCED > Networking page to specify a server to which the Barracuda Spam & Virus
Firewall sends syslog data. Syslog is a standard UNIX/Linux tool for sending remote system logs and
is available on all UNIX/Linux systems. Syslog servers are also available for Windows platforms
from a number of free and premium vendors. Barracuda Networks has tested with a Windows
freeware syslog server from Kiwi Enterprises (www.kiwisyslog.com). Barracuda Networks makes no
guarantees that your Barracuda Spam & Virus will be completely compatible with this syslog server.
The Web Syslog data contains information about user login activities and any configuration changes
made on the machine. This syslog data appears on the local facility with login information at the info
priority level, and configuration changes appear at the debug priority level on the specified syslog
server.
The Mail Syslog captures data related to mail flow and is the same information as that used to build
the Message Log in the Barracuda Spam & Virus Firewall. The Mail Syslog includes data such as the
connecting IP, envelope 'From' address, envelope 'To' address, and the spam score for the messages
transmitted. This syslog data appears on the mail facility at the debug priority level on the specified
syslog server.
See the Syslog Configuration section of the ADVANCED > Troubleshooting page for the facility to
open a window and view the Mail Syslog or Web Syslog output.
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Front Panel Indicator Lights
The Barracuda Spam & Virus Firewall has five indicator lights on the front panel that blink when the
system processes any message. Figure 9.1 displays the location of each of the lights.
Figure 9.1: Barracuda Spam & Virus Firewall front panel indicator lights
Monitoring the System 105
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Chapter 10
Maintenance
This chapter provides instructions for general maintenance of the Barracuda Spam & Virus Firewall
using the Web interface, and covers the following topics:
Updating the Firmware and Definitions.......................................... 108
Backing up and Restoring Your System ........................................... 109
Reloading, Restarting, and Shutting Down the System ................... 110
Using the Built-in Troubleshooting Tools .........................................111
Rebooting the System in Recovery Mode......................................... 112
Maintenance 107
Updating the Firmware and Definitions
Updating the Firmware on your Barracuda Spam & Virus Firewall
This should be one of the steps the administrator performs in the initial installation of the Barracuda
Spam & Virus Firewall. The ADVANCED > Firmware Update page allows you to manually update the
firmware version of the system or revert to a previous version.The only time you should revert back
to an old firmware version is if you recently downloaded a new version that is causing unexpected
problems. In this case, call Barracuda Networks Contacting Technical Support before reverting back
to a previous firmware version.
If you have the latest firmware version already installed, the Download Now button will be disabled.
Note
Applying a new firmware version results in a temporary loss of service. For this reason, you should
apply new firmware versions during non-busy hours. Before upgrading, BE SURE TO TAKE THE
Barracuda Spam & Virus Firewall OFFLINE. This will ensure that the inbound mail queue is
emptied and all messages are scanned before the upgrade process begins. DO NOT MANUALLY
REBOOT YOUR SYSTEM at any time during an upgrade, unless otherwise instructed by Technical
Support.
The current firmware version shows in the top section of the page, with the latest General Release
version of the firmware shown below in the Firmware Download section. To download the latest
firmware version, click the Download Now button. The Web interface will display download
progress. When the firmware download is complete, click the Apply Now button. The Barracuda
Spam & Virus Firewall will reboot and you will need to log in again to the Web interface.
Updating the Definitions from Energize Updates
This should be one of the steps the administrator performs in the initial installation of the Barracuda
Spam & Virus Firewall.The ADVANCED > Energize Updates page allows you to manually update the
Virus, Policy, and Document Definitions used on your Barracuda Spam & Virus Firewall, as well as
change the interval at which the system checks for updates. We recommend that the Automatic
Update option be set to On for all three types of definitions so that your Barracuda Spam & Virus
Firewall receives the latest rules as soon as they are made available by Barracuda Networks.
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Backing up and Restoring Your System
Three Types of Backups Available
The ADVANCED > Backup page lets you back up and restore three kinds of backup files for your
Barracuda Spam & Virus Firewall:
•
•
•
System configuration
Bayesian databases - global and per-user (if your model supports per-user)
Explicit Accepted Users and Alias Linking data
You should back up your system on a regular basis in case you need to restore this information on a
replacement Barracuda Spam & Virus Firewall or in the event that your current system data becomes
corrupt.
To prepare the system for backing up, first configure your backup server information, then select
which, if not all, backups you want to create, and, if desired, a schedule of automated backups on the
ADVANCED > Backup page. If you are restoring a backup file on a new Barracuda Spam & Virus
Firewall that is not configured, you first need to assign your new system an IP address and DNS
information on the BASIC > IP Configuration page of the new system.
Note the following about the backup files:
•
•
•
Do not edit backup files. Any configuration changes you want to make need to be done through
the Web interface. The configuration backup file contains a checksum that prevents the file from
being uploaded to the system if any changes are made.
You can safely view a backup file in Windows WordPad or TextPad. You should avoid viewing
backup files in Windows Notepad because the file can become corrupted if you save the file
from this application.
Information not backed up with the system configuration file includes system password,
system IP information, DNS information and clustering settings. For a complete list of settings
that are not backed up, please see the online help of the ADVANCED > Backup page.
Restoring a Backup
Restoring a backup simply requires browsing your local system with the click of a button on the
ADVANCED > Backup page and selecting a backup file. Please see the online help on that page for
details about restoring backups.
.
Warning
Do not restore a configuration file onto a machine that is currently part of a cluster. All cluster
information will be lost and the units will need to be re-clustered if this happens.
Maintenance 109
Reloading, Restarting, and Shutting Down the System
The System Management/Shutdown section on the BASIC > Administration page allows you to shut
down, restart, and reload system configuration on the Barracuda Spam & Virus Firewall. You can also
take the system offline if necessary, which is recommended whenever you do a Firmware Update. A
unit in Offline (Maintenance) mode will stop accepting incoming mail until it is put back online.
Shutting down the system powers off the unit. Restarting the system reboots the unit. Reloading the
system re-applies the system configuration.
You can also perform a hard reset of the Barracuda Spam & Virus Firewall by pressing the RESET
button on the front panel of the system. Caution should be used when pressing the reset button,
however, since doing so while the Barracuda Spam & Virus Firewall is in the midst of a configuration
update or other task can result in inadvertent corruption of the system.
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Using the Built-in Troubleshooting Tools
The ADVANCED > Troubleshooting page provides various tools that help troubleshoot network
connectivity issues that may be impacting the performance of your Barracuda Spam & Virus Firewall.
For example, you can test your Barracuda Spam & Virus Firewall’s connection to the Barracuda
Networks update servers to make sure that it can successfully download the latest Energize Update
definitions. You can also ping other devices from the Barracuda Spam & Virus Firewall, perform a
trace route from the Barracuda Spam & Virus Firewall to any another system, and execute various
other troubleshooting commands.
Maintenance 111
Rebooting the System in Recovery Mode
If your Barracuda Spam & Virus Firewall experiences a serious issue that impacts its core
functionality, you can use diagnostic and recovery tools that are available from the reboot menu (see
below) to return your system to an operational state.
Before you use the diagnostic and recovery tools, do the following:
•
•
•
Use the built-in troubleshooting tools on the ADVANCED > Troubleshooting page to help
diagnose the problem.
Perform a system restore from the last known good backup file.
Contact Barracuda Networks Contacting Technical Support for additional troubleshooting tips.
As a last resort, you can reboot your Barracuda Spam & Virus Firewall and run a memory test or
perform a complete system recovery, as described below.
To perform a system recovery or hardware test:
1.
Connect a monitor and keyboard directly to your Barracuda Spam & Virus Firewall.
2.
Reboot the system by doing one of the following:
• Click the Restart button on the BASIC > Administration page.
• Press the Power button on the front panel to turn off the system, and then press the Power
button again to turn the system back on.
The Barracuda splash screen displays with the following three boot options:
Barracuda
Recovery
Hardware_Test
3.
Use your keyboard to select the desired boot option, and press Enter.
You must select the boot option within three seconds of the splash screen appearing. If you do
not select an option within three seconds, the Barracuda Spam & Virus Firewall defaults to
starting up in the normal mode (first option).
For a description of each boot option, refer to Reboot Options below..
Note
To stop a hardware test, reboot your Barracuda Spam & Virus Firewall by pressing Ctrl-Alt-Del on
the keyboard you’ve connected to the appliance.
Reboot Options
Table 10.1 describes the options available at the reboot menu.
Table 10.1: Reboot Options
112
Reboot Options
Description
Barracuda
Starts the Barracuda Spam & Virus Firewall in the normal (default)
mode. This option is automatically selected if no other option is
specified within the first three (3) seconds of the splash screen
appearing.
Barracuda Spam & Virus Firewall Adminstrator’s Guide
Table 10.1: Reboot Options
Reboot Options
Description
Recovery
Displays the Recovery Console where you can select the following
options:
• Perform file system repair: Repairs the file system on the
Barracuda Spam & Virus Firewall.
• Perform full system re-image: Restores the factory settings on
your Barracuda Spam & Virus Firewall and clears out all
configuration information.
• Enable remote administration: Initiates a connection to that allows
Barracuda Networks Technical Support to access the system.
Another method for enabling this troubleshooting connection is to
click Establish Connection to Barracuda Networks on the
ADVANCED >Troubleshooting page.
• Run diagnostic memory test: Runs a diagnostic memory test from
the operating system. If problems are reported when running this
option, we recommend running the Hardware_Test option next.
Hardware_Test
Performs a thorough memory test that shows most memory related
errors within a two-hour time period. The memory test is performed
outside of the operating system and can take a long time to complete.
Reboot your Barracuda Spam & Virus Firewall to stop the hardware
test.
Replacing a Failed System
Before you replace your Barracuda Spam & Virus Firewall, use the tools provided on the ADVANCED
> Troubleshooting page to try to resolve the problem.
Barracuda Instant Replacement Service
In the event that a Barracuda Spam & Virus Firewall fails and you cannot resolve the issue, customers
that have purchased the Instant Replacement service can call Barracuda Networks Technical Support
and arrange for a new unit to be shipped out within 24 hours.
After receiving the new system, ship the old Barracuda Spam & Virus Firewall back to Barracuda
Networks at the address below with an RMA number marked clearly on the package. Barracuda
Networks Technical Support can provide details on the best way to return the unit.
Barracuda Networks
3175 S. Winchester Blvd
Campbell, CA 95008
attn: RMA # <your RMA number>
Note
To set up the new Barracuda Spam & Virus Firewall so it has the same configuration as your old
failed system, first manually configure the new system’s IP information on the BASIC > IP
Configuration page, and then restore the backup file from the old system onto the new system. For
information on restoring data, refer to Backing up and Restoring Your System in this chapter.
Maintenance 113
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Appendix A
About the Hardware
Hardware Compliance
This section contains compliance information for the Barracuda Spam & Virus Firewall hardware.
Notice for the USA
Compliance Information Statement (Declaration of Conformity Procedure) DoC FCC Part 15: This
device complies with part 15 of the FCC Rules.
Operation is subject to the following conditions:
1.
This device may not cause harmful interference, and
2.
This device must accept any interference received including interference that may cause
undesired operation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user in encouraged
to try one or more of the following measures:
•
•
•
•
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Plug the equipment into an outlet on a circuit different from that of the receiver.
Consult the dealer on an experienced radio/ television technician for help.
Notice for Canada
This apparatus compiles with the Class B limits for radio interference as specified in the Canadian
Department of Communication Radio Interference Regulations.
Notice for Europe (CE Mark)
This product is in conformity with the Council Directive 89/336/EEC, 92/31/EEC (EMC).
About the Hardware 115
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Appendix B
Limited Warranty and License
Limited Warranty
Barracuda Networks, Inc., or the Barracuda Networks, Inc. subsidiary or authorized Distributor
selling the Barracuda Networks product, if sale is not directly by Barracuda Networks, Inc.,
("Barracuda Networks") warrants that commencing from the date of delivery to Customer (but in case
of resale by a Barracuda Networks reseller, commencing not more than sixty (60) days after original
shipment by Barracuda Networks, Inc.), and continuing for a period of one (1) year: (a) its products
(excluding any software) will be free from material defects in materials and workmanship under
normal use; and (b) the software provided in connection with its products, including any software
contained or embedded in such products will substantially conform to Barracuda Networks published
specifications in effect as of the date of manufacture. Except for the foregoing, the software is
provided as is. In no event does Barracuda Networks warrant that the software is error free or that
Customer will be able to operate the software without problems or interruptions. In addition, due to
the continual development of new techniques for intruding upon and attacking networks, Barracuda
Networks does not warrant that the software or any equipment, system or network on which the
software is used will be free of vulnerability to intrusion or attack. The limited warranty extends only
to you the original buyer of the Barracuda Networks product and is non-transferable.
Exclusive Remedy
Your sole and exclusive remedy and the entire liability of Barracuda Networks under this limited
warranty shall be, at Barracuda Networks or its service centers option and expense, the repair,
replacement or refund of the purchase price of any products sold which do not comply with this
warranty. Hardware replaced under the terms of this limited warranty may be refurbished or new
equipment substituted at Barracuda Networks option. Barracuda Networks obligations hereunder are
conditioned upon the return of affected articles in accordance with Barracuda Networks then-current
Return Material Authorization ("RMA") procedures. All parts will be new or refurbished, at
Barracuda Networks discretion, and shall be furnished on an exchange basis. All parts removed for
replacement will become the property of the Barracuda Networks. In connection with warranty
services hereunder, Barracuda Networks may at its discretion modify the hardware of the product at
no cost to you to improve its reliability or performance. The warranty period is not extended if
Barracuda Networks repairs or replaces a warranted product or any parts. Barracuda Networks may
change the availability of limited warranties, at its discretion, but any changes will not be retroactive.
IN NO EVENT SHALL BARRACUDA NETWORKS LIABILITY EXCEED THE PRICE PAID
FOR THE PRODUCT FROM DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF THE PRODUCT, ITS
ACCOMPANYING SOFTWARE, OR ITS DOCUMENTATION.
Limited Warranty and License 117
Exclusions and Restrictions
This limited warranty does not apply to Barracuda Networks products that are or have been (a)
marked or identified as "sample" or "beta," (b) loaned or provided to you at no cost, (c) sold "as is,"
(d) repaired, altered or modified except by Barracuda Networks, (e) not installed, operated or
maintained in accordance with instructions supplied by Barracuda Networks, or (f) subjected to
abnormal physical or electrical stress, misuse, negligence or to an accident.
EXCEPT FOR THE ABOVE WARRANTY, BARRACUDA NETWORKS MAKES NO OTHER
WARRANTY, EXPRESS, IMPLIED OR STATUTORY, WITH RESPECT TO BARRACUDA
NETWORKS PRODUCTS, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTY OF TITLE, AVAILABILITY, RELIABILITY, USEFULNESS,
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR
ARISING FROM COURSE OF PERFORMANCE, DEALING, USAGE OR TRADE. EXCEPT
FOR THE ABOVE WARRANTY, BARRACUDA NETWORKS PRODUCTS AND THE
SOFTWARE IS PROVIDED "AS IS" AND BARRACUDA NETWORKS DOES NOT WARRANT
THAT ITS PRODUCTS WILL MEET YOUR REQUIREMENTS OR BE UNINTERRUPTED,
TIMELY, AVAILABLE, SECURE OR ERROR-FREE, OR THAT ANY ERRORS IN ITS
PRODUCTS OR THE SOFTWARE WILL BE CORRECTED. FURTHERMORE, BARRACUDA
NETWORKS DOES NOT WARRANT THAT BARRACUDA NETWORKS PRODUCTS, THE
SOFTWARE OR ANY EQUIPMENT, SYSTEM OR NETWORK ON WHICH BARRACUDA
NETWORKS PRODUCTS WILL BE USED WILL BE FREE OF VULNERABILITY TO
INTRUSION OR ATTACK.
Software License
PLEASE READ THIS SOFTWARE LICENSE AGREEMENT ("AGREEMENT") CAREFULLY
BEFORE USING THE BARRACUDA SOFTWARE. BY USING THE BARRACUDA
SOFTWARE YOU ARE AGREEING TO BE BOUND BY THE TERMS OF THIS LICENSE. IF
YOU DO NOT AGREE TO THE TERMS OF THIS LICENSE DO NOT USE THE SOFTWARE.
IF YOU DO NOT AGREE TO THE TERMS OF THIS LICENSE YOU MAY RETURN THE
SOFTWARE OR HARDWARE CONTAINING THE SOFTWARE FOR A FULL REFUND TO
YOUR PLACE OF PURCHASE.
1. The software, documentation, whether on disk, in read only memory, or on any other media or in
any other form (collectively "Barracuda Software") is licensed, not sold, to you by Barracuda
Networks, Inc. ("Barracuda") for use only under the terms of this License and Barracuda reserves all
rights not expressly granted to you. The rights granted are limited to Barracuda's intellectual property
rights in the Barracuda Software and do not include any other patent or intellectual property rights.
You own the media on which the Barracuda Software is recorded but Barracuda retains ownership of
the Barracuda Software itself.
2. Permitted License Uses and Restrictions. This License allows you to use the Software only on the
single Barracuda labeled hardware device on which the software was delivered. You may not make
copies of the Software and you may not make the Software available over a network where it could
be utilized by multiple devices or copied. You may not make a backup copy of the Software. You may
not modify or create derivative works of the Software except as provided by the Open Source
Licenses included below. The BARRACUDA SOFTWARE IS NOT INTENDED FOR USE IN THE
OPERATION OF NUCLEAR FACILITIES, AIRCRAFT NAVIGATION OR COMMUNICATION
SYSTEMS, LIFE SUPPORT MACHINES, OR OTHER EQUIPEMENT IN WHICH FAILURE
COULD LEAD TO DEATH, PERSONAL INJURY, OR ENVIRONMENTAL DAMAGE.
3. You may not transfer, rent, lease, lend, or sublicense the Barracuda Software.
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4. This License is effective until terminated. This License is automatically terminated without notice
if you fail to comply with any term of the License. Upon termination you must destroy or return all
copies of the Barracuda Software.
5. YOU EXPRESSLY ACKNOWLEDGE AND AGREE THAT THE USE OF THE BARRACUDA
SOFTWARE IS AT YOUR OWN RISK AND THAT THE ENTIRE RISK AS TO
SATISFACTION, QUALITY, PERFORMANCE, AND ACCURACY IS WITH YOU. THE
BARRACUDA SOFTWARE IS PROVIDED "AS IS" WITH ALL FAULTS AND WITHOUT
WARRANTY OF ANY KIND, AND BARRACUDA HEREBY DISCLAIMS ALL WARRANTIES
AND CONDITIONS WITH RESPECT TO THE BARRACUDA SOFTWARE, EITHER
EXPRESSED OR IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES AND/OR CONDITIONS OF MERCHANTIBILITY, OF
SATISFACTORY QUALITY, OF FITNESS FOR ANY APPLICATION, OF ACCURACY, AND
OF NON-INFRINGEMENT OF THIRD PARTY RIGHTS. BARRACUDA DOES NOT
WARRANT THE CONTINUED OPERATION OF THE SOFTWARE, THAT THE
PERFORMANCE WILL MEET YOUR EXPECTATIONS, THAT THE FUNCTIONS WILL
MEET YOUR REQUIREMENTS, THAT THE OPERATION WILL BE ERROR FREE OR
CONTINUOUS, OR THAT DEFECTS WILL BE CORRECTED. NO ORAL OR WRITTEN
INFORMATION GIVEN BY BARRACUDA OR AUTHORIZED BARRACUDA
REPRESENTATIVE SHALL CREATE A WARRANTY. SHOULD THE BARRACUDA
SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE ENTIRE COST OF ALL NECESSARY
SERVICING, REPAIR, OR CORRECTION.
6. License. YOU EXPRESSLY ACKNOWLEDGE AND AGREE THAT YOU WILL PROVIDE
AN UNLIMITED ZERO COST LICENSE TO BARRACUDA FOR ANY PATENTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS UTILIZED IN THE BARRACUDA SOFTWARE
WHICH YOU EITHER OWN OR CONTROL.
7. Limitation of Liability. TO THE EXTENT NOT PROHIBITED BY LAW, IN NO EVENT
SHALL BARRACUDA BE LIABLE FOR PERSONAL INJURY OR ANY INCIDENTAL
SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER, INCLUDING,
WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, LOSS OF DATA, BUSINESS
INTERRUPTION, OR ANY OTHER COMMERCIAL DAMAGES OR LOSSES, ARISING OUT
OF OR RELATED TO YOUR ABILITY TO USE OR INABILITY TO USE THE BARRACUDA
SOFTWARE HOWEVER CAUSED, REGARDLESS OF THE THEORY OF LIABILITY AND
EVEN IF BARRACUDA HAS BEEN ADVISED OF THE POSSIBILITY OF DAMAGES. In no
event shall Barracuda's total liability to you for all damages exceed the amount of one hundred dollars.
8. Export Control. You may not use or otherwise export or re-export Barracuda Software except as
authorized by the United States law and the laws of the jurisdiction where the Barracuda Software
was obtained.
Energize Update Software License
PLEASE READ THIS ENERGIZE UPDATE SOFTWARE LICENSE CAREFULLY BEFORE
DOWNLOADING, INSTALLING OR USING BARRACUDA NETWORKS OR BARRACUDA
NETWORKS-SUPPLIED ENERGIZE UPDATE SOFTWARE.
BY DOWNLOADING OR INSTALLING THE ENERGIZE UPDATE SOFTWARE, OR USING
THE EQUIPMENT THAT CONTAINS THIS SOFTWARE, YOU ARE CONSENTING TO BE
BOUND BY THIS LICENSE. IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS
LICENSE, THEN (A) DO NOT DOWNLOAD, INSTALL OR USE THE SOFTWARE, AND (B)
YOU MAY RETURN THE SOFTWARE FOR A FULL REFUND, OR, IF THE SOFTWARE IS
SUPPLIED AS PART OF ANOTHER PRODUCT, YOU MAY RETURN THE ENTIRE
Limited Warranty and License 119
PRODUCT FOR A FULL REFUND. YOUR RIGHT TO RETURN AND REFUND EXPIRES 30
DAYS AFTER PURCHASE FROM BARRACUDA NETWORKS OR AN AUTHORIZED
BARRACUDA NETWORKS RESELLER, AND APPLIES ONLY IF YOU ARE THE ORIGINAL
PURCHASER.
The following terms govern your use of the Energize Update Software except to the extent a particular
program (a) is the subject of a separate written agreement with Barracuda Networks or (b) includes a
separate "click-on" license agreement as part of the installation and/or download process. To the
extent of a conflict between the provisions of the foregoing documents, the order of precedence shall
be (1) the written agreement, (2) the click-on agreement, and (3) this Energize Update Software
License.
License. Subject to the terms and conditions of and except as otherwise provided in this Agreement,
Barracuda Networks, Inc., or a Barracuda Networks, Inc. subsidiary (collectively "Barracuda
Networks"), grants to the end-user ("Customer") a nonexclusive and nontransferable license to use
the Barracuda Networks Energize Update program modules and data files for which Customer has
paid the required license fees (the "Energize Update Software"). In addition, the foregoing license
shall also be subject to the following limitations, as applicable:
Unless otherwise expressly provided in the documentation, Customer shall use the Energize Update
Software solely as embedded in, for execution on, or (where the applicable documentation permits
installation on non-Barracuda Networks equipment) for communication with Barracuda Networks
equipment owned or leased by Customer; Customer's use of the Energize Update Software shall be
limited to use on a single hardware chassis, on a single central processing unit, as applicable, or use
on such greater number of chassis or central processing units as Customer may have paid Barracuda
Networks the required license fee; and Customer's use of the Energize Update Software shall also be
limited, as applicable and set forth in Customer's purchase order or in Barracuda Networks' product
catalog, user documentation, or web site, to a maximum number of (a) seats (i.e. users with access to
the installed Energize Update Software), (b) concurrent users, sessions, ports, and/or issued and
outstanding IP addresses, and/or (c) central processing unit cycles or instructions per second.
Customer's use of the Energize Update Software shall also be limited by any other restrictions set
forth in Customer's purchase order or in Barracuda Networks' product catalog, user documentation or
web site for the Energize Update Software.
General Limitations. Except as otherwise expressly provided under this Agreement, Customer shall
have no right, and Customer specifically agrees not to:
i.
transfer, assign or sublicense its license rights to any other person, or use the Energize
Update Software on unauthorized or secondhand Barracuda Networks equipment, and any
such attempted transfer, assignment or sublicense shall be void;
ii.
make error corrections to or otherwise modify or adapt the Energize Update Software or
create derivative works based upon the Energize Update Software, or to permit third parties
to do the same; or
iii. decompile, decrypt, reverse engineer, disassemble or otherwise reduce the Energize Update
Software to human-readable form to gain access to trade secrets or confidential
information in the Energize Update Software.
Upgrades and Additional Copies. For purposes of this Agreement, "Energize Update Software" shall
include (and the terms and conditions of this Agreement shall apply to) any Energize Update
upgrades, updates, bug fixes or modified versions (collectively, "Upgrades") or backup copies of the
Energize Update Software licensed or provided to Customer by Barracuda Networks or an authorized
distributor/reseller for which Customer has paid the applicable license fees. NOTWITHSTANDING
ANY OTHER PROVISION OF THIS AGREEMENT: (1) CUSTOMER HAS NO LICENSE OR
RIGHT TO USE ANY SUCH ADDITIONAL COPIES OR UPGRADES UNLESS CUSTOMER,
AT THE TIME OF ACQUIRING SUCH COPY OR UPGRADE, ALREADY HOLDS A VALID
LICENSE TO THE ORIGINAL ENERGIZE UPDATE SOFTWARE AND HAS PAID THE
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APPLICABLE FEE FOR THE UPGRADE; (2) USE OF UPGRADES IS LIMITED TO
BARRACUDA NETWORKS EQUIPMENT FOR WHICH CUSTOMER IS THE ORIGINAL END
USER PURCHASER OR LESSEE OR WHO OTHERWISE HOLDS A VALID LICENSE TO USE
THE ENERGIZE UPDATE SOFTWARE WHICH IS BEING UPGRADED; AND (3) USE OF
ADDITIONAL COPIES IS LIMITED TO BACKUP PURPOSES ONLY.
Energize Update Changes. Barracuda Networks reserves the right at any time not to release or to
discontinue release of any Energize Update Software and to alter prices, features, specifications,
capabilities, functions, licensing terms, release dates, general availability or other characteristics of
any future releases of the Energize Update Software.
Proprietary Notices. Customer agrees to maintain and reproduce all copyright and other proprietary
notices on all copies, in any form, of the Energize Update Software in the same form and manner that
such copyright and other proprietary notices are included on the Energize Update Software. Except
as expressly authorized in this Agreement, Customer shall not make any copies or duplicates of any
Energize Update Software without the prior written permission of Barracuda Networks. Customer
may make such backup copies of the Energize Update Software as may be necessary for Customer's
lawful use, provided Customer affixes to such copies all copyright, confidentiality, and proprietary
notices that appear on the original.
Protection of Information. Customer agrees that aspects of the Energize Update Software and
associated documentation, including the specific design and structure of individual programs,
constitute trade secrets and/or copyrighted material of Barracuda Networks. Customer shall not
disclose, provide, or otherwise make available such trade secrets or copyrighted material in any form
to any third party without the prior written consent of Barracuda Networks. Customer shall implement
reasonable security measures to protect and maintain the confidentiality of such trade secrets and
copyrighted material. Title to Energize Update Software and documentation shall remain solely with
Barracuda Networks.
Indemnity. Customer agrees to indemnify, hold harmless and defend Barracuda Networks and its
affiliates, subsidiaries, officers, directors, employees and agents at Customers expense, against any
and all third-party claims, actions, proceedings, and suits and all related liabilities, damages,
settlements, penalties, fines, costs and expenses (including, without limitation, reasonable attorneys
fees and other dispute resolution expenses) incurred by Barracuda Networks arising out of or relating
to Customers (a) violation or breach of any term of this Agreement or any policy or guidelines
referenced herein, or (b) use or misuse of the Barracuda Networks Energize Update Software.
Term and Termination. This License is effective upon date of delivery to Customer of the initial
Energize Update Software (but in case of resale by a Barracuda Networks distributor or reseller,
commencing not more than sixty (60) days after original Energize Update Software purchase from
Barracuda Networks) and continues for the period for which Customer has paid the required license
fees. Customer may terminate this License at any time by notifying Barracuda Networks and ceasing
all use of the Energize Update Software. By terminating this License, Customer forfeits any refund
of license fees paid and is responsible for paying any and all outstanding invoices. Customer's rights
under this License will terminate immediately without notice from Barracuda Networks if Customer
fails to comply with any provision of this License. Upon termination, Customer must cease use of all
copies of Energize Update Software in its possession or control.
Export. Software, including technical data, may be subject to U.S. export control laws, including the
U.S. Export Administration Act and its associated regulations, and may be subject to export or import
regulations in other countries. Customer agrees to comply strictly with all such regulations and
acknowledges that it has the responsibility to obtain licenses to export, re-export, or import Energize
Update Software.
Limited Warranty and License 121
Restricted Rights. Barracuda Networks' commercial software and commercial computer software
documentation is provided to United States Government agencies in accordance with the terms of this
Agreement, and per subparagraph "(c)" of the "Commercial Computer Software - Restricted Rights"
clause at FAR 52.227-19 (June 1987). For DOD agencies, the restrictions set forth in the "Technical
Data-Commercial Items" clause at DFARS 252.227-7015 (Nov 1995) shall also apply.
No Warranty. The Energize Update Software is provided AS IS. Customer's sole and exclusive
remedy and the entire liability of Barracuda Networks under this Energize Update Software License
Agreement will be, at Barracuda Networks option, repair, replacement, or refund of the Energize
Update Software.
Renewal. At the end of the Energize Update Service Period, Customer may have the option to renew
the Energize Update Service at the current list price, provided such Energize Update Service is
available. All initial subscriptions commence at the time of sale of the unit and all renewals
commence at the expiration of the previous valid subscription.
In no event does Barracuda Networks warrant that the Energize Update Software is error free or that
Customer will be able to operate the Energize Update Software without problems or interruptions. In
addition, due to the continual development of new techniques for intruding upon and attacking
networks, Barracuda Networks does not warrant that the Energize Update Software or any equipment,
system or network on which the Energize Update Software is used will be free of vulnerability to
intrusion or attack.
DISCLAIMER OF WARRANTY. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS, AND WARRANTIES INCLUDING, WITHOUT LIMITATION, ANY
IMPLIED WARRANTY OR CONDITION OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, NONINFRINGEMENT, SATISFACTORY QUALITY OR ARISING
FROM A COURSE OF DEALING, LAW, USAGE, OR TRADE PRACTICE, ARE HEREBY
EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW. TO THE EXTENT AN
IMPLIED WARRANTY CANNOT BE EXCLUDED, SUCH WARRANTY IS LIMITED IN
DURATION TO THE WARRANTY PERIOD. BECAUSE SOME STATES OR JURISDICTIONS
DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, THE
ABOVE LIMITATION MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC
LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM
JURISDICTION TO JURISDICTION.
General Terms Applicable to the Energize Update Software License Disclaimer of Liabilities. IN NO
EVENT WILL BARRACUDA NETWORKS BE LIABLE FOR ANY LOST REVENUE, PROFIT,
OR DATA, OR FOR SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR PUNITIVE
DAMAGES HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY
ARISING OUT OF THE USE OF OR INABILITY TO USE THE ENERGIZE UPDATE
SOFTWARE EVEN IF BARRACUDA NETWORKS OR ITS SUPPLIERS HAVE BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. In no event shall Barracuda Networks'
liability to Customer, whether in contract, tort (including negligence), or otherwise, exceed the price
paid by Customer. BECAUSE SOME STATES OR JURISDICTIONS DO NOT ALLOW
LIMITATION OR EXCLUSION OF CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE
ABOVE LIMITATION MAY NOT APPLY TO YOU.
This Energize Update Software License shall be governed by and construed in accordance with the
laws of the State of California, without reference to principles of conflict of laws, provided that for
Customers located in a member state of the European Union, Norway or Switzerland, English law
shall apply. The United Nations Convention on the International Sale of Goods shall not apply. If any
portion hereof is found to be void or unenforceable, the remaining provisions of the Energize Update
Software License shall remain in full force and effect. Except as expressly provided herein, the
Energize Update Software License constitutes the entire agreement between the parties with respect
to the license of the Energize Update Software and supersedes any conflicting or additional terms
contained in the purchase order.
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Open Source Licensing
Barracuda products may include programs that are covered by the GNU General Public License
(GPL) or other "open source" license agreements. The GNU license is re-printed below for you
reference. These programs are copyrighted by their authors or other parties, and the authors and
copyright holders disclaim any warranty for such programs. Other programs are copyright by
Barracuda Networks.
GNU GENERAL PUBLIC LICENSE, (GPL) Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing
it is not allowed.
Preamble
The licenses for most software are designed to take away your freedom to share and change it. By
contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free software--to make sure the
software is free for all its users. This General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to using it. (Some other Free
Software Foundation software is covered by the GNU Library General Public License instead.) You can
apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General Public Licenses
are designed to make sure that you have the freedom to distribute copies of free software (and charge
for this service if you wish), that you receive source code or can get it if you want it, that you can
change the software or use pieces of it in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or
to ask you to surrender the rights. These restrictions translate to certain responsibilities for you
if you distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whethergratis or for a fee, you must give the
recipients all the rights that you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their rights.
We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which
gives you legal permission to copy, distribute and/or modify the software.
Also, for each author's protection and ours,
there is no warranty for this free software.
on, we want its recipients to know that what
introduced by others will not reflect on the
we want to make certain that everyone understands that
If the software is modified by someone else and passed
they have is not the original, so that any problems
original authors' reputations.
Finally, any free program is threatened constantly by software patents. We wish to avoid the danger
that redistributors of a free program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any patent must be licensed for
everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and modification follow.
GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains a notice placed by the copyright
holder saying it may be distributed under the terms of this General Public License. The "Program",
below, refers to any such program or work, and a "work based on the Program" means either the Program
or any derivative work under copyright law: that is to say, a work containing the Program or a portion
of it, either verbatim or with modifications and/or translated into another language. (Hereinafter,
translation is included without limitation in the term "modification".) Each licensee is addressed
as "you".
Activities other than copying, distribution and modification are not covered by this License; they are
outside its scope. The act of running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the Program (independent of having been
made by running the Program). Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any
medium, provided that you conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License
and to the absence of any warranty; and give any other recipients of the Program a copy of this
License along with the Program.
You may charge a fee for the physical act of transferring a copy, and you may at your option offer
warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based
on the Program, and copy and distribute such modifications or work under the terms of Section 1 above,
provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices stating that you changed the files
and the date of any change.
b) You must cause any work that you distribute or publish, that in whole or in part contains or
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Limited Warranty and License 123
c) If the modified program normally reads commands interactively when run, you must cause it, when
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Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If identifiable sections of that work are
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Thus, it is not the intent of this section to claim rights or contest your rights to work written
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In addition, mere aggregation of another work not based on the Program with the Program (or with a
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124
Barracuda Spam & Virus Firewall Administrator’s Guide
system in reliance on consistent application of that system; it is up to the author/donor to decide
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software
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To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion
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one line to give the program's name and an idea of what it does.
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Gnomovision version 69, Copyright (C) 19yy name of author Gnomovision comes with ABSOLUTELY NO
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The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use
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Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes
passes at compilers) written by James Hacker.
signature of Ty Coon, 1 April 1989
Ty Coon, President of Vice
Limited Warranty and License 125
This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may
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Barracuda Spam & Virus Firewall Administrator’s Guide
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Limited Warranty and License 127
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128
Barracuda Spam & Virus Firewall Administrator’s Guide
Index
A
C
Account creation
automatic 84
disabling 85
manually, by administrators 85
manually, by users 85
Activation of subscriptions and updates 33
Advanced networking topics 70
alerts
emailed 100
SNMP 100
system 100
Alias Linking 65, 78
All_domains permissions
assigning 90
Domain Admin 93
Helpdesk 91
allowed email recipient domains 33
API for remote configuration of the Barracuda Spam & Virus
Firewall 96
Attachment blocking, notifications of 41
Authentication
LDAP, POP, RADIUS 48
single sign on 48
Certificate generation 39
Classify incoming emails 41
clustering the Barracuda Spam & Virus Firewall
data not synchronized across the cluster 68
limiting user access to a clustered system 48
setting up clustered systems 67
configuration
reloading 110
Configure 30
B
Backscatter, Reducing 71
Backup
Bayesian database 109
configuration database 109
Explicit Accepted Users list 109
Barracuda Central 10
Bayesian learning
classifying messages 41
getting the best accuracy 59
how it works 58
when to use it 60
block score 40
Bounce messages, sending or not 71
Bounce suppression 49
Index - 129
D
daily mail statistics 98
definitions, updating 34, 108
diagnostic memory test 113
Disk space, managing 81
DNS configuration 32
Domain Admin account role 93
domain configuration, default for the Barracuda Spam &
Virus Firewall 32
domain level settings 95
E
email
routing incoming 35
Energize Updates 108
Ethernet interfaces 70
Explicit Accepted Users and Alias Linking 109
F
failed system, replacing 113
Firewall, locating the Barracuda Spam & Virus Firewall in
your network 26
Firmware update 108
Front panel indicator lights 105
H
hardware compliance 115
hardware test 113
Helpdesk account role 91
Hostname, default used in reply address 32
hourly mail statistics 98
P
I
Permissions, user-level 79
POP 48
POP authentication 48
Port Forwarding 70
post-installation tasks 40
Preferences, enabling users to edit 86
Private (self-signed) certificates 39
indicator lights 105
Initial 32
installation examples 26
Instant Replacement Service 113
Invalid Bounce Suppression 62
IP address, initial setting 30
L
Language
blocking email by country 57
Non-delivery reports (NDRs) 71
notifications 80
Web Interface, selecting 38
LDAP authentication 48
LEDs (on front panel) 105
Load Balancer in Direct Server Return Mode, configuring for
70
Logging in
administrator login 32
new account credentials 86
Loopback Adaptor 70
M
mail statistics 42, 98
Mail syslog 99
memory test 113
Message Log 41, 99
Models of the Barracuda Spam & Virus Firewall 14
monitoring tasks 97
MX records 35
N
network interfaces, configuring 72
network settings, initial configuration 30
Non-Delivery Reports (NDRs) 71
Notifications
default language 80
for blocked attachments 41
of quarantined messages 80
O
Online Help 10
Outbound Relay
with LDAP authentication 49
Outbound relay
configuring 35, 49
130 -
Q
Quarantine
disabling 75
domain level settings 78
global 76
inbox 78, 79
notifications 80
per-user 77
setting up 43
where quarantined messages go 77
Queue
inbound and outbound Messages 98
retrying queued outbound messages 98
R
RADIUS authentication 48
RAID 14
reboot options 112
Recipient Verification 65
recovery mode 112
re-imaging the system 113
reloading the system 110
remote administration 113
Replacement Service (Instant) 113
replacing a failed system 113
Reporting 102
Requeuing outbound messages 98
RESET button 110
restarting the system 110
Restoring a backup 109
Retention Policy and Purging Old Messages. page 80 74
Retry Button to Requeue Email 98
Role-based Administration 84
Roles
Domain Admin 93
Helpdesk 91
User 90
Routing Email 35
routing incoming email 35
S
Securing user access with single sign on 48
Sender Policy Framework (SPF) 63
shutting down the system 110
Single Sign On
newly created accounts 86
user authentication 48
SMTP Encryption 49
SNMP query and alerts 100
spam scoring
configuring via the API 46
domain level settings 37
initial settings 40
overview 13
per-user settings 37
SSL certificates, generating 39
Static Routes 70
Storage of email, minimizing 81
Syslog
mail syslog 99
using a syslog server for monitoring 104
system
reboot 110
shutdown 110
system alerts 100
T
tag score 40
Task Manager, using to monitor system tasks 103
TCP ports 30
technical support, contacting 16
time zone 38
TLS encryption 49
Troubleshooting tools 111
Trusted (signed by a trusted CA) certificates 39
Trusted Forwarder 63
U
UDP ports 30
Updating
definitions 108
firmware 108
UPS Support 29
User Access, Limiting 48
User account role 90
User accounts
enabling features 86
User Features, Default 78
V
virus checking, enabling and disabling 41
virus notifications 41
W
Warranty, limited 117
Index - 131
Web interface
for configuration 10
logging in 32
setting the default language 38
SSL-only access 39
132 -
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