Barracuda Networks 4 Guide d'installation télécharger pdf (Page 56)

56 Barracuda Spam Firewall Administrator’s Guide

Sending Spam Messages to Barracuda Networks

• When you classify messages as spam in the Message Log the Barracuda Spam Firewall sends a

copy of the spam message to Barracuda Networks for further analysis. This allows Barracuda

Networks to improve the spam definitions and intent analysis provided in the Energize Updates.

• To configure the system to not send spam messages to Barracuda Networks, go to the

Basic > Bayesian/Intent page and set the Submit Email to Barracuda Networks field to No.

Synchronizing the Bayesian Database

• If one of your Barracuda Spam Firewalls has a Bayesian database that is superior to the other

systems in the cluster, you can click

Synchronize on the Basic > Bayesian/Intent page to copy

the database to the other systems.

• When synchronizing databases, make sure you are logged into the Barracuda Spam Firewall that

has the database you want to propagate. After you click Synchronize, the Bayesian databases on

the other clustered systems will be replaced.

• The most common time to synchronize databases is when you add a new system to a cluster. In

this case, you would first add the new system to the cluster, then log into an existing system in

the cluster that has the best Bayesian database, and click

Synchronize to propagate the database

to the new system (and all others in the cluster).

• Sychronization is quicker than backing up an existing Bayesian database and restoring it onto

the new system.

Enabling Intent Analysis

Intention Analysis attempts to match URLs in a message against a database of URLs known for

sending spam. By enabling intent analysis you can block messages that contain such URLs and

significantly reduce the amount of spam received by your users.

Table 4.16:

Field Description

Intent Analysis Whether messages that contain offending URLs should be tagged,

quarantined, or blocked. Selecting to tag or quarantine a message may

result in reduced system performance because the Barracuda Spam

Firewall will continue to process the message in an attempt to filter

possible spam using stricter rules.

To disable intent analysis, select Off (not recommended).

Realtime Intent Analysis In addition to using the database of URLs that the Barracuda Spam

Firewall receives from the Energize Updates on an hourly basis, your

system can also communicate with Barracuda Central in realtime to

check against the latest lists and block even the newest spam.

Note: Turning this option on can cause a slight increase in mail scanning

time as network (DNS) lookups will need to be performed.

URL Exemptions Exemptions can be made for specific URLs from Intention Analysis. Any

messages containing the exempted URLs will still be scanned, but the

messages will not be blocked, quarantined or tagged.

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Barracuda Networks 4 Guide d'installation Page 56

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