I've just completed building an installation of ISPconfig on Centos5. All has gone very smooth, thanks to the Centos5 HowTo.
My present issue is getting mail clients to be able to retrieve their email via pop3. Everyone can read/send email via the UebiMiau interface, but everyone email client's are failing to login.
example from /var/log/secure
dovecot-auth: pam_succeed_if(dovecot:auth): error retrieving information about user firstname.lastname@example.org
and from /var/log/maillog
dovecot: pop3-login: Disconnected: user=<email@example.com>, method=PLAIN, rip=::ffff:18.104.22.168, lip=::ffff:22.214.171.124
the domains and users are in the /etc/postfix/virtualusertable and /etc/postfix/localhostnames .
It's got to be something simple that I am missing.