Nick, ComCast blocks port 25. That is probably what you are seeing. The question is how do I route mail delivery to my iMap server through 465 or 587. Port 25 is open on my firewall, but your telnet to port 25 should never get through ComCast, and I am sure that is what you are seeing. I need to query SMTP2GO to see how they are routing, I guess. If those emails are being routed to port 25, that's probably the answer to this problem.