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Barracuda Email Security Gateway

How do I configure Outbound Relay on the Barracuda Spam Firewall?

  • Type: Knowledgebase
  • Date changed: 3 years ago
Solution #00002087

Scope:
All Barracuda Spam Firewalls, all firmware revisions.

Answer:
The Barracuda Spam Firewall can be configured to fully process either incoming or outgoing mail, but an inbound Barracuda may also be configured to relay outgoing mail simultaneously. The Barracuda still scans outgoing mail, but not as thoroughly as incoming mail. Outbound, relayed mail is scanned for everything except Recipient Verification and Tagging. This means outbound, relayed mail IS scanned for RBL checks, Rate control, Whitelist/Blacklist, Intent, Virus scanning, Fingerprinting (in firmware 3.4 and above), Attachment Filtering, Spam Score, Bayesian Analysis and Block regular expressions. As such, using an inbound Barracuda with Outbound Relay will increase the load on the Barracuda.

In firmware version 4.x, outbound scanning will cover the following:

  • Spam Scoring
  • Rate Control
  • IP Analysis
  • Reverse DNS blocking
  • Custom Contents Filtering
  • Attachment Filtering
  • Fingerprint Analysis
  • Intent Analysis
  • Image Analysis
  • Sender Domain
  • Sender Email
  • Recipient Filters
  • Virus Checking

In firmware version 4.x, outbound scanning will not cover:

  • Recipient Verification
  • Tag Action
  • Per-User Quarantine Action


To configure Outbound Relay on the Barracuda, you can go to the Basic > Outbound (firmware version 4.0 and earlier, go to Advanced > Outbound/Relay) page in the Barracuda Spam Firewall's web interface and enter your mail server's IP address into the Trusted Relay IP/Range section with a netmask of 255.255.255.255.

Once Outbound Relay has been configured, all outgoing mail will be logged in the message log.

Additional Notes:
Since the mail server will now be making multiple connections to the Barracuda Spam Firewall, be sure to add the mail server's IP address to the Rate Control Exclude IP/Range field This will ensure that the Barracuda Spam Firewall does not block connections from the mail server for Rate Control.

Firmware version 3.5.x and earlier
Go to the Advanced > Rate Control page and enter your mail server's IP address into the Rate Control Exclude IP/Range section with a netmask of 255.255.255.255.

Firmware version 4.0.x and later
Go to the Block/Accept > Rate Control page and enter your mail server's IP address into the Rate Control Exemption IP/Range section with a netmask of 255.255.255.255.

If you want to skip all scanning (except for virus scanning) on outgoing mail, you can whitelist your mail server's IP address on the Block/Accept > IP Block/Accept (pre 4.0 firmware) or IP Filters (on 4.x and later) page.

Link to This Page:
https://campus.barracuda.com/solution/50160000000Gg8gAAC