first_valid_uid

[Aki Tuomi]

On 27.05.2016 23:52, Vince42 wrote:
> Hi,
>
> [Aki Tuomi] - [27.05.2016 22:33]
>>> I have error log entries like
>>>
>>> dovecot: lmtp(22155, mail): Error: user mail: Mail access for users with
>>> UID 8 not permitted (see first_valid_uid in config file, uid from userdb
>>> lookup).
>>>
>>> This obviously tells me that the user mail (UID 8) is trying to access
>>> the LMTP daemon. How can I find out why he is doing so and how I can get
>>> rid of this error message?
>>> The mail system (Ubuntu 14.04 LTS : Postfix + Dovecot) is working - but
>>> probably not properly configured.
>> Check your postfix logs? Maybe there is a clue? Grep for the uid 8
>> username.
> The mail log says
>
>
> May 27 22:14:36 server postfix/qmgr[15415]: B05AC15E25C4:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/trivial-rewrite[26512]: warning: do not
> list domain domain.tld in BOTH mydestination and virtual_alias_domains
> May 27 22:14:36 server postfix/qmgr[15415]: A329215E2678:
> from=<webmin at server.domain.tld>, size=707, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 62CAA15E24F6:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: C321615E2883:
> from=<webmin at server.domain.tld>, size=707, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 0815B15E253A:
> from=<webmin at server.domain.tld>, size=707, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 1212315E27A3:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 4374015E25F5:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 4FA1D15E245F:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 4A65815E24ED:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: 21F6C15E2760:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server postfix/qmgr[15415]: D7F9515E24B5:
> from=<webmin at server.domain.tld>, size=708, nrcpt=1 (queue active)
> May 27 22:14:36 server dovecot: lmtp(26518): Connect from local
> May 27 22:14:36 server dovecot: lmtp(26518, mail): Error: user mail:
> Mail access for users with UID 8 not permitted (see first_valid_uid in
> config file, uid from userdb lookup).
> May 27 22:14:36 server dovecot: lmtp(26518): Disconnect from local:
> Successful quit
> May 27 22:14:36 server dovecot: lmtp(26518): Connect from local
> May 27 22:14:36 server dovecot: lmtp(26518, mail): Error: user mail:
> Mail access for users with UID 8 not permitted (see first_valid_uid in
> config file, uid from userdb lookup).
> May 27 22:14:36 server dovecot: lmtp(26518): Disconnect from local:
> Successful quit
> May 27 22:14:36 server postfix/lmtp[26517]: A329215E2678:
> to=<mail at domain.tld>, orig_to=<domain.tld at domain.tld>,
> relay=server.domain.tld[private/dovecot-lmtp], delay=29904,
> delays=29904/0.01/0.01/0, ds
> n=4.3.0, status=deferred (host server.domain.tld[private/dovecot-lmtp]
> said: 451 4.3.0 <mail at domain.tld> Temporary internal error (in reply to
> end of DATA command))
> May 27 22:14:36 server postfix/lmtp[26516]: B05AC15E25C4:
> to=<mail at domain.tld>, orig_to=<domain.tld at 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 at domain.tld> Temporary internal error (in reply to
> end of DATA command))
>
>
> which shows more information but leaves me still clueless. Maybe it is a
> problem that domain.tld is listed in Postfix's mydestination and
> virtual_alias_domains, maybe it is due a "Connect from local", maybe
> it's an LMTP misconfiguration ... I hope that somebody will be able to
> shed some light on this - and maybe even explain the problem to me. :)))
>

May 27 22:14:36 server postfix/lmtp[26516]: B05AC15E25C4:
to=<mail at domain.tld>, orig_to=<domain.tld at 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 at domain.tld> Temporary internal error (in reply to
end of DATA command))


Your webmin is sending email to domain.tld at domain.tld which is forwarded 
to mail at domain.tld, which happens to have local UID 8. And you have 
configured min_uid to prevent this.

Maybe fix your transport config? =)

Aki