I setup postfix on my Suse 9.2 box with Webmin, and I can send e-mail and recieve just fine. My problem is, once a message or two is recieved, it will sit in the user's box like normal until they download it, which is normal. But if the user does not download the message from their mailbox within 20 or so minutes, postfix will grab all the messages and return them to the senders. The error the senders get is,

This is the Postfix program at host mail.young-fam.com.

I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<clint@localhost>: mail forwarding loop for clint@localhost
I hope this makes sense, I can't seem to figure it out. Let me know if any more info is needed?