Title: The Hidden Power of Sender and Recipient Filtering Author: Amit Zinman Summary: The mail filtering capabilities in Exchange 2003 are often overlooked, especially for companies who bought more snazzy anti-spam packages and think nothing much of the seemingly rudimentary options provided by Exchange 2003. However, using these options can help ease the load off your server and possibly your anti-virus and anti-spam packages if used wisely because the Sender and Recipient Filtering options can drop connections for Exchange 2003. This means that connections made by the server trying to deliver the mail item is blocked by the SMTP engine. This is faster and more efficient than evaluating the mail after it is received and already in the mail queue. Link: http://www.MSExchange.org/tutorials/Sender-Recipient-Filtering.html