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Barracuda Email Security Service
Barracuda Email Security Service

Step 3 - Configure Outbound Mail Scanning

Important
Before using the Barracuda Email Security Service outbound filter, go to http://barracudacentral.org/lookups[1] and verify that your outbound IP address is not on the Barracuda Reputation list. If it is present on the list, contact Barracuda Technical Support and request removal before using the outbound service.

 

You can configure the Barracuda Email Security Service to simultaneously scan both inbound and outbound mail. Use the steps in this article to enable outbound mail spam and virus scanning.

Step 1. Add Valid Sender IP Address Ranges

  1. Log in to the Barracuda Email Security Service, and go to OUTBOUND SETTINGS > Sender IP Address Ranges.
  2. Enter the IP Address and Domain Name (logging domain) and optional Comment for IP address ranges allowed to send outgoing email from your domains, and click Add. Note that each mail server must contain a reverse DNS PTR record.

Add all IP addresses from which outgoing mail is allowed to flow through the Barracuda Email Security Service. The Logging Domain is the domain name that appears in the Message Log as the sending domain for the associated IP address.

Important
To assure Barracuda Networks is the authorized sending mail service for outbound mail recipients, review your domain's Sender Policy Framework (SPF) record. SPF is an open standard specifying a method to prevent sender address forgery. See Sender Authentication for more information. If you have an SPF record set up for your domain, edit the existing record and add the following to the INCLUDE line for each domain sending outbound mail: include:spf.ess.barracudanetworks.com

If you do not have an SPF record set up for your domain, use the following value to create a TXT record that creates a SOFTFAIL SPF for your domain: v=spf1 include:spf.ess.barracudanetworks.com ~all

Step 2. Configure Your Mail Server or Smart Host

Complete the following steps for each domain from which you are relaying outbound mail:

  1. Log in to the Barracuda Email Security Service, and go to DOMAINS > Domain Manager.
  2. Note the Outbound Hostname for the domain that is to relay outbound mail.
  3. Specify this value in your mail mail server or smart host.

Step 3. Verify Mail is Flowing

  1. Log in to the Barracuda Email Security Service.
  2. In the DASHBOARD page verify inbound and outbound messages are being logged for the selected domain.

    You can also click MESSAGE LOG to view inbound and outbound email traffic. Use the filters to refine your search. See The Message Log for more information on message filtering.

Table 1. Outbound Mail Settings.

FeatureDescriptionRelated Articles
Outbound Mail Scanning
All messages routed through the Barracuda Email Security Service are subject to a 300MB size limit. This includes all headers, body, and attached content.

Outbound mail scanning includes:

  • Spam Scanning with Block or Quarantine actions
  • Virus Scanning  
  • IP Address Filtering
  • Sender Domain, Username or Email Address Filtering
  • Recipient Email Address Filtering
  • Content Filtering (Subject, Header and Body) with Block, Allow, Encrypt, or Quarantine actions
  • Attachment Filtering
  • Intent Analysis

The following tools are not applied to outbound mail:

  • IP Reputation, a sender authentication mechanism
  • Sender Policy Framework (SPF), a sender authentication mechanism
  • DomainKeys (DKIM) inspection
  • Exempt/blocklist
Outbound Quarantine
Outbound Mail Encryption

To prevent data leakage and ensure compliance with financial, healthcare, and other federally regulated agency information policies, you can require all email sent from any or all configured domains to be encrypted by configuring outbound mail encryption policies on the OUTBOUND SETTINGS > Content Policies page at the domain level.

Inbound and outbound email transmission can also be required over a TLS channel.

How to Use DLP and Encryption of Outbound Mail

Secured Message Transmission

Outbound Message FooterYou can configure Barracuda Email Security Service to append a custom text and/or html footer to each outbound message 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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