[Dovecot] auth: passwd file (info): unknown user

Hello,

the problem is: The users are system users (by Confixx) say webxpy. But behind it e-mail puts of course address like info@domain.de and so on. Everything functions perfectly, nevertheless, is following in the log.

… … dovecot: auth: passwd file (jk): unknown user … dovecot: auth: passwd file (jim.knuth): unknown user … dovecot: auth: passwd file (info): unknown user … and so on

It is tried obviously, before the domain part in the passwd file to find user info … However, there is in it only webxpy. How can I solve this dilemma, by which does this come then?

auth_username_format = %n

Thanks in advance

as attached mine dovecot-n

-- Mit freundlichen Grüßen, with kind regards, Jim Knuth