logins fail for virtual users (permission denied, we're not in group 5000)

[Paul Schreiber]

> On Sep 16, 2017, at 5:05 PM, Paul Schreiber <paulschreiber at gmail.com> wrote:
> 
> Followup:
> 
> Received help on serverfault.com. Fix was to edit 10-master.conf. In the service auth { … } section, setting either:
> 	extra_groups = vmail
> or
> 	group = vmail
> …allows things to work.

One thing that’s still a bit odd — even with logins working, I see two warnings in the log for each successful login:

2017-09-16 16:46:18 auth-worker(27699): Info: pam(paul at travler.net,204.15.194.116,<sGzTmVRZeuPMD8J0>): pam_authenticate() failed: Authentication failure (password mismatch?)
2017-09-16 16:46:18 auth-worker(27699): Info: passwd(paul at travler.net,204.15.194.116,<sGzTmVRZeuPMD8J0>): unknown user
2017-09-16 16:46:18 imap-login: Info: Login: user=<paul at travler.net>, method=PLAIN, rip=204.15.194.116, lip=204.15.194.116, mpid=27738, TLS, session=<sGzTmVRZeuPMD8J0>

How can I fix that?

Paul