Configuring and Enabling Sender ID Filtering in Exchange 2003 SP2

Overview

As many of people already know Sender ID is an e-mail industry initiative invented by Microsoft and a few other industry leaders. The purpose of Sender ID is to help counter spoofing, which is the number one deceptive practice used by spammers. Sender ID works by verifying every e-mail message indeed originates from the Internet domain from which it was sent. This is accomplished by checking the address of the server sending the mail against a registered list of servers that the domain owner has authorized to send e-mail. This paper explains the purpose and benefits of enabling Sender ID filtering in Exchange 2003 SP2, as well as shows how to configure this feature.