SMTP OK, but POP isn't!!

[Hatem]

I have no problems sending messages using my qmail server as SMTP and it works fine! but.. when I try to send an e-mail to any of the address to it (POP3D service) it gives me this error: This is an automatically generated Delivery Status Notification. Delivery to the following recipients failed.        [EMAIL PROTECTED] Reporting-MTA: dns;mail.hotmail.com Received-From-MTA: dns;mail.hotmail.com Arrival-Date: Tue, 6 Mar 2001 04:21:21 -0800 Final-Recipient: rfc822;[EMAIL PROTECTED] Action: failed Status: 5.0.0 Diagnostic-Code: smtp;553 To send mail, first check your mail with a valid POP account; this prevents unauthorized SPAM relaying. (#5.7.1) I am totally exhausted!! can someone help a bit for the (hopefully) last push!! thanks. Hatem