Hi,
[Aki Tuomi] - [27.05.2016 22:59]
May 27 22:14:36 server postfix/lmtp[26516]: B05AC15E25C4: to=mail@domain.tld, orig_to=domain.tld@domain.tld, relay=server.domain.tld[private/dovecot-lmtp], delay=8910, delays=8910/0.01/0.01/0, dsn= 4.3.0, status=deferred (host server.domain.tld[private/dovecot-lmtp] said: 451 4.3.0 mail@domain.tld Temporary internal error (in reply to end of DATA command))
Your webmin is sending email to domain.tld@domain.tld which is forwarded to mail@domain.tld, which happens to have local UID 8. And you have configured min_uid to prevent this.
Maybe fix your transport config? =)
Ouch ... I guess I missed the wood for the trees ... I hope that I found the reason for this error now ... thank you very much for pointing me into the right direction!
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