OK. It is comcast. They are universally blocking port 25. SO, I guess I need to find a way to setup an MX record that routes to an alternate port??? Port 465?
It is idiotic for them to block outbound forwarded email from their servers to their own customers on port 25. Since this is blocked at the modem it would seem to be technically simple to allow it to be open for their own server.
Any ideas?