Hi All, Our Delivery Status Notification's are being sent out as if from one of our admins - the "From:" fieldhas an actual admins name, rather than "System Admin"). Can anyone tell me where this is defined in Exchange 2003 SP1? Thanks in advance.

Check on that person's e-mail addresses list and see if that person has postermaster@yourdomain.com as one of his/her e-mail addresses. I usually create a mailbox called Company Postmaster and give that SMTP address to that mailbox.