I am trying to setup a simple application relay through the Exchange 2007 Server and it is giving me nothing but a headache. I have followed the directions in this link backwards and forwards and can not get it to work.
I tried both option 1 and option 2. I had a feeling it may be related to the fact that the local IP's and the remote IPs are in the same network. I originally had the remote IPs setup to include the entire LAN then I cut it back to just the two IPs I was testing with. When I telnet into the server I can get to the RCPT to: section and then it errors out with the 550 5.7.1 Unable to relay for....
I have restarted the Transport service in the hope that might help but no joy. Any help would be appreciated.