do you have other domains hosted on this server? there should be a "main" IP for the server that the default SMTP points to... try that IP. When I get a chance later tonight, I'll sign onto our server and check the configuration...
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.