I am trying to block mail into our exchange server that meet certain criteria whether it be an individual address or a domain. I went into the Exchange System Manager and on Global Settings I right clicked the Message Delivery and clicked properties. Under the filter tab, I added our addresses and domains. I tried to test it by blocking my yahoo e-mail account, but after sending a test message it came right through. Is there somthing else that needs to be done in order to block specific e-mail addresses or domains?