[Dovecot] POP3 notice if password expired

[Vaidas Pilkauskas]

Hi,

We just migrated our IMAP service to Dovecot and it performs very well.

We also want to migrate our POP3 service (qpopper) to Dovecot.

The problem is that Dovecot and Qpopper differently act 
on expired passwords:

Qpopper: -ERR "user": password expired.

Dovecot: -ERR Authentication failed.

Are there any way to tell Dovecot to report about expired passwords?

We have about 30000 users and 84 days password lifecycle. "Password
expired" notifications highly reduce the number of support calls from 
our users. 

Server setup info:
Solaris 9 SPARC, PAM authentication.

Thanks,
Vaidas Pilkauskas
Vilnius University