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In my opinion there is only one thing which could cause this problem: I updated my dovecot on 2013/11/04 from 2.2.6-1~auto+36 to 2.2.7-1~auto+2
I updated two days ago.
@Timo, did you changed something within LMTP? ;-D
I will try to downgrade again, did someone have a clue?
I have no clue what leads to those random rejections of recipient addresses. After setting ...
| warn_if_reject reject_unverified_recipient
... those mails are accepted. But I do consider this a temporary workaround.
This workaround did it for me too, hope this is considered as a bug and fixed soon.
Regards, Michael
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