Barracuda Email Security Service

Step 3: Configure Scanning of Outbound Mail

Last update: Monday, 18. Nov 2013

The Barracuda Email Security Service may be configured to scan outgoing mail simultaneously with scanning inbound mail. To enable spam and virus scanning of outbound mail, follow the steps below.


Add Valid Sender IP Address Ranges

From the OUTBOUND SETTINGS > Sender IP Address Ranges page:

  1. Add and verify domains for outbound mail by following the steps in Step 2: Initial Setup of the Service.
  2. Click the Add button. Enter the IP Address and Domain Name (logging domain) and an optional Comment, and then click Add. Note that each mail server must contain a reverse DNS PTR record.

Each IP address from which you want to allow outgoing mail through the Barracuda Email Security Service must be listed on this page. The Logging Domain is the domain name that will appear in the Message Log as the sending domain for the associated IP address.

Important: To assure recipients of outbound mail from your Barracuda Email Security Service that Barracuda Networks is the authorized sending mail service, please add the following to the INCLUDE line of the SPF record for each of your domains sending outbound mail:     include:spf.ess.barracudanetworks.com

Configure Your Mail Server or Smart Host

To relay outbound mail through the Barracuda Email Security Service, in your mail server or Smart host, specify the hostname value from the Outbound Hostname field on the DOMAINS > Domain Manager page for each domain from which you'll be relaying outbound mail.

Verify That Mail is Flowing

Check the STATUS and MESSAGE LOG pages to make sure that inbound and outbound messages are being logged for the selected domain. The Message Log page provides rich searching using a set of keywords with your search words or phrases. See The Message Log for more information on filtering messages.

What Outbound Mail Scanning Includes

  • Spam Scanning with Block or Quarantine actions
  • Virus Scanning - if you enable it on the OUTBOUND SETTINGS > Anti-virus page (recommended)
  • IP Address Filtering
  • Sender Domain, Username or Email Address Filtering
  • Recipient Email Address Filtering
  • Content Filtering (Subject, Header and Body)
  • Attachment Filtering
  • Image Analysis
  • Intent Analysis

The following scanning tools are not applied to outbound mail:

  • IP Reputation, a sender authentication mechanism
  • SPF (Sender Policy Framework), a sender authentication mechanism
  • Whitelist/blocklist
All messages going through the Barracuda Email Security Service are subject to a size limit of 300MB. This includes all headers, body and attached content.

Encryption of Outbound Mail

To prevent data leakage and ensure compliance with financial, health care and other federally regulated agency information policies, you can require all email sent from any or all domains configured in your Barracuda Email Security Service to be encrypted. Create policies for encryption of outbound mail in the OUTBOUND > Content Policies page at the domain level. See How to Use DLP and Encryption of Outbound Mail for more information.

Transmission of inbound and outbound email can be required over a TLS channel as well - see Secured Message Transmission for details.

Outbound Message Footer

The Barracuda Email Security Service can append a custom text and/or html footer to each outbound message, configurable at the global level on the OUTBOUND SETTINGS > Tagline/Footer page.

Continue with Step 4: Tune and Monitor the Default Spam and Virus Settings.


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