Ok, so here is the deal. We have a client that is using exchange 2003. Previously this server was up and running without any issues. Now, there is no mail flow internally, or externally. I have checked smtp connectors, DNS, mx records, with the ISP, and cannot find what is going on. I think it is kind of funny that i cannot even send to a local user. When I run the exchange mail flow troubleshooter, all I get is a possible gateway issue. But doing an nslookup, and telnetting to the server works fine. Everything looks perfoect on this server, but no mail. HELP!