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Why is my QMAIL server having trouble performing recipient verification over SMTP with my Barracuda Spam Firewall?

  • Type: Knowledgebase
  • Date changed: 3 years ago
Solution #00000657

All Barracuda Spam Firewalls used in conjunction with a QMAIL server, all firmware versions.

By default the QMAIL email server software will not validate recipients during the SMTP transaction. However, there is a patch available so that QMAIL can return a 550 error for invalid recipients during the SMTP transaction.

Information on the patch can be found on the following website:


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