I am running Exchange 5.5 SP4 on a 2000 box. My outgoing queue keeps getting email in there that has either no originator or no destination. These messages are processed, but it causes alot of unnecessary traffic. My machine is configured to reroute only to my domain inbound and i have checked Host and clients with these IP addresses checked. The box for that is left blank. Please advise. I am doing what microsoft forums have recommended.