dovecot - Sep 2005 - Authentication Failure

I installed Dovecot on our FC3 sendmail server and get this from our Dallas
office ( out of state to me ).

dovecot(pam_unix)[13823]: authentication failure; logname= uid=0 euid=0 tty=
ruser= rhost

Only one Dallas user can get mail (pop3 or imap). All local users work fine. 
I ended upgoing back to UW and all works fine. 
What should I look for? 

Thanks 
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On Tue, 2005-09-13 at 08:43 -0500, Dovecot wrote:
> I installed Dovecot on our FC3 sendmail server and get this from our
> Dallas office ( out of state to me ). 
> 
> dovecot(pam_unix)[13823]: authentication failure; logname= uid=0
> euid=0 tty= ruser= rhost 
> 
> Only one Dallas user can get mail (pop3 or imap). All local users work
> fine. 
> I ended upgoing back to UW and all works fine. 
> What should I look for? 
Well, how are Dallas users local users different? Where are the users
defined?

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