Sounds like a spammer is using an address in your domain as the sender or
reply to in the messages they are sending out.
\\Steve//
From: Kelsey, John [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 13, 2008 9:38 AM
To: MS-Exchange Admin Issues
Subject: Getting pounded with Antigen Mes
<mailto:[EMAIL PROTECTED]>
***
-Original Message-
From: Steve Szabo [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 13, 2008 22:34
To: MS-Exchange Admin Issues
Subject: RE: Getting pounded with Antigen Messages!