first_valid_uid

[Vince42]

Hi,

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.

-- 
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