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About Scanning of Outbound Mail

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The Barracuda Email Security Gateway may be configured to scan outgoing mail simultaneously with scanning inbound mail. Virus Scanning and Rate Control are applied to outbound mail as well as the following filters, if specifically enabled, which are configurable from the BASIC > Spam Checking and BLOCK/ACCEPT pages:

  • Spam Scoring, with Block or Quarantine actions
  • IP Address Filtering
  • Sender Domain Filtering
  • Sender Email Address Filtering
  • Recipient Filtering
  • Content Filtering (Subject, Header and Body)
  • Attachment Filtering
  • Fingerprint Analysis
  • Image Analysis
  • Intent Analysis

The following scanning tools are not applied to outbound mail:

  • SPF (Sender Policy Framework), a sender authentication mechanism
  • DKIM (DomainKeys), an email authentication system designed to verify the DNS domain of an email sender
  • Regional Settings, the application of special spam analysis rules for particular languages
  • Per-user Whitelist/Blocklist
  • Per-domain Whitelist/Blocklist
  • IP Reputation checks

These are the policies that can be applied to outbound mail using the BLOCK/ACCEPT pages:

To scan outgoing mail with the Barracuda Email Security Gateway, you must configure outbound operation on the BASIC > Outbound page (see How to Route Outbound Mail from the Barracuda Email Security Gateway). There you’ll specify your trusted outbound mail server IP address or domain name (either your mail server or another trusted relay), identify a Smart host if you have one, and, optionally, an authentication type. The Barracuda Email Security Gateway supports SMTP/SASL authentication and LDAP. 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 Email Security Gateway to scan outbound as well as inbound mail will increase the load on the system. You may find that you need to upgrade your Barracuda Email Security Gateway to another model.

When configuring outbound mail, ensure that your network firewall blocks all port 25 traffic that doesn't originate from your Barracuda Email Security Gateway.

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