[Dovecot] Incorrect Responses on deliverable mails with LMTP server

Thomas Leuxner tlx at leuxner.net
Mon Nov 11 20:54:29 EET 2013


* Michael Grimm <trashcan at odo.in-berlin.de> 2013.11.11 19:17:

> Interesting, but how can those mails become delivered with a "status=undeliverable"? Except, that you don't use reject_unverified_recipient in your smtpd_recipient_restrictions, true?
> 
> Jan and myself need explicit "warn_if_reject reject_unverified_recipient" in postfix' smtpd_recipient_restrictions ...
> 	http://dovecot.org/list/dovecot/2013-November/093326.html
> 	http://dovecot.org/list/dovecot/2013-November/093331.html
> ... to get such mails delivered.

I have to admit that I very briefly skimmed your mails as they had this '+' delimiter reference in it, which I don't use. Now looking more closely this is clearly the same issue I'm facing. The LMTP server took a hit with the latest release.

As to smtpd_recipient_restrictions, I actually do have reject_unverified_recipient in it, without the 'warn_if_reject' safety net. I was also suprised that the address probe did not lead to rejections, guessing it is because of the temporary failure it gives.

Regards
Thomas
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