Problems with Mail11?

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Perch
Has anyone else had issues with mail backing up on Mail11?

A couple of days ago, I had to submit a ticket to get mail flowing again. Today, the same symptoms occur, and another ticket was submitted.

The issue I'm having is that mail is delivered only to internal addresses, but no forwarded mail or external domain emails are being delivered.
 
We had found root cause being spammer sending false mails to an auto responder making huge amounts of replies, disabled the auto responder now.
 
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