Mail password not accepted / ISPConfig

[midcarolina]

Hi,

This is the strangest thing with my mail system. Let me give my set-up first:

Fedora 14 x86 64 w/ ISPConfig 3.0.4.1 Postfix, Dovecot (Falko's Perfect Server)

The php mailer is working fine - example mail delivered through wordpress or email marketing. When a client sets up the mail server mail.example.com (as smtp, imap, pop), MS Exchange, Thunderbird, and several other mail systems recognize the servers right away, but the set-up can never be completed because the password is always refused. We have tried on several domains and changed passwords numerous times, each time with the same result. I would tell you the maillog, but it is completely empty. Only the root mail has any info, all of which pertain to fail2ban, etc.

Any ideas? Thanks