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Why are emails being blocked for an 'empty' attachment filtering rule on my Barracuda Spam Firewall?

  • Type: Knowledgebase
  • Date changed: 4 years ago
Solution #00003401

Scope:
All Barracuda Spam & Virus Firewalls, firmware versions 3.5.11 and above.

Answer:
In 3.5.11 and above, if any attachment filtering rules exist for any substring of the word empty, like mp or pty, the Barracuda Spam & Virus Firewall will block said emails if they contain empty attachments. This can be avoided if the attachment filters in question have the . in front of the extensions listed, like .mp or .pty.

If the Barracuda Spam & Virus Firewall is blocking emails for this reason, the headers of the email (viewable via the Basic > Message Log page) will contain something like this:

X-Barracuda-Filename-Alert: BANNED FILENAME, message contains part named:
.empty

Link to This Page:
https://campus.barracuda.com/solution/50160000000HBrdAAG