[Dovecot] IMAP vs system username logging with checkpassword auth

[dale gallagher]

Hi

After upgrading to dovecot 1.0.7 I noticed that the actual username is
no longer logged, but rather the system user (in my case 'vmail')
under which my virtual set-up runs. Now I'm unable to see which
virtual users log in. Any pointers on how to configure dovecot to log
the actual username given during the IMAP dialogue would be
appreciated.

My dovecot.conf includes the following:

auth default {
  mechanisms = plain
  passdb checkpassword {
    args = /var/qmail/bin/qmail-vauth
  }
  userdb prefetch {
  }
  user = auth
}

An example logfile entry:

2007-11-03 15:41:56.027191500 dovecot: Info: imap-login: Login:
user=<vmail>, method=PLAIN, rip=192.168.0.141, lip=192.168.0.10, TLS