I am having a problem where email to certain domains is failing with the error "Domain does not exist". Now, we are able to send this mail from an outside source, i.e. hotmail, with no problem. In my firewall, there is an error about packets getting dropped that coincide with the email errors. The Firewall is reporting "Packets dropped: RPC Mapper". So, what's the deal? Do I need to have Port 135 open through my firewall for the RPC? Any ideas? Richard Spencer Internet Production Manger Network Administrator RGC Communications 630.307.8811 x118 rspencer@xxxxxxxxxxx