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How do I set up SMTP Auth or LDAP to allow users to relay mail through my Barracuda Spam Firewall from outside my network?

  • Type: Knowledgebase
  • Date changed: 4 years ago

Solution #00004411



This solution applies to all Barracuda Spam Firewalls.



You can allow internal users that are out of your network to authenticate against the mail server to send mail through Barracuda Spam Firewall.

  1. Choose the type of authentication for external users in Advanced > Outbound Relay > SMTP Authentication/SASL Settings.

  2. You can choose one of the two authentication methods. In firmware versions before 4.0, LDAP Authentication is configured in Advanced > Outbound Relay > Edit LDAP Settings. SMTP Authentication is configured in Advanced > Outbound Relay > SMTP AUTH Proxy Settings. You will need to enter the IP address of the destination mail server which has the SMTP authentication enabled. In firmware version 4.0 this information is configured in Advanced > Outbound. In firmware version 4.1 and later these settings are found under Basic > Outbound.

  3. In your email client you need to set the SMTP server as the external IP or Hostname of your Barracuda Spam Firewall.

  4. In your email client enable SMTP authentication.


Consult your email client’s documentation for information on how to enable SMTP Authentication in your email client.

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