Is there a way to prevent distribution lists from accepting emails that is external (not part of the domain)? For instance, my domain is xyz.com. Only users who are part of xyz.com are allowed to send email to distribution lists at xyz.com. The distribution lists will reject email from all other sources. We are running Exchange 2000 enterprise edition. Regards, Mark ------------------------------------ Mark Budman Systems Engineer Devry College of Technology 5860 Chedworth Way Mississauga, ON L5R 3W3 mbudman@xxxxxxxxxxxx (905) 502-5193x6235 / (800) 249-5777 ------------------------------------