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Why am I seeing a decrease in the number of emails processed by the Barracuda Spam & Virus Firewall?

  • Type: Knowledgebase
  • Date changed: 9 months ago
Solution #00004051

Scope:
Email Security Gateway firmware release 3.5.12.010 and higher.

Answer:
The reason you are seeing a decrease in the number of emails being processed by the Email Security Gateway firmware release 3.5.12.010 and higher is because rate control violations are now returning a 421 SMTP error to the client.  A 421 SMTP error means the service is not available and the connection will be closed.  In previous firmware versions, the Email Security Gateway would return a '5xx' error after reaching twice the threshold set for rate control.

Link:
http://www.barracuda.com/kb?id=50160000000He2e