email services frustration

I'm getting a SuSE 9.1 installation ready to be used as a mail server for a client. I've done the complete 9.1 installation and update. I have postfix running, and it can send mail to my regular mail accounts. I'm trying to get pop & imap services running and am getting nowhere. I have all varieties of pop & imap up, and the proper ports are listening on the server. However, I can retrieve mail neither from a networked workstation or even locally on the machine itself. I'm using regular linux user accounts (no virtual). I've tried various password authentication types in case there were some encryption running that I wasn't aware of. I've reset my password to be sure I know what it is. Nothing seems to help here. Ideas? Rob