Postfix removing domain from user names before passing to Dovecot for IMAP authentication

Posted by chernevik on Server Fault See other posts from Server Fault or by chernevik
Published on 2010-05-11T16:26:38Z Indexed on 2010/05/11 16:34 UTC
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Filed under:

postfix

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imap

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dovecot

In IMAP authentication with Dovecot, Postfix is stripping the domain name from virtual users who share a name with a local user, causing them to fail authentication. Virtual users without local accounts don't have this problem.

How can I prevent this? Failing an answer, how can I debug Postfix to see what's going on? I've turned on every debugging option I can get, and I'm not seeing anything helpful in the logs.

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