Hello. Have an NT 4.0 SP6a NT server running Exchange 5.5 SP4. Added list of domains using the "@domainname.com" format to turftable registry key. Stopped and restarted Internet Mail Service, but messages from those domains are still being delivered to users. As a test, I removed all the entries and manually added a single hotmail.com address going to the Message Filtering button for the IMC. Stopped and restarted the Internet Mail Service, sent a test message from the hotmail account, and it still got through. The instructions appear to be pretty straight forward. Any ideas on what I'm missing? Thanks!