It seems like your browser didn't download the required fonts. Please revise your security settings and try again.
Barracuda Campus Barracuda Campus

Back to Knowledgebase

Why am I receiving "Recipient Verification Unavailable" errors when not using LDAP on the Email Security Gateway?

  • Type: Knowledgebase
  • Date changed: one year ago

Solution #00005984


Scope: 

This solution applies to the Email Security Gateway, all firmware versions.


Answer:
In some situations, the destination mail server will return a 450 "Invalid Recipient" response back to the Spam Firewall, causing this error to appear.

Solving any issues on the destination mail server that would generate 450 errors will cause these notifications to cease.


Link to this page:

http://www.barracudanetworks.com/kb?id=50160000000IlyH