I too am having trouble sending. I try to telnet the SMTP server with a port # either 25 or 587 and the Telnet just hangs. I can receive finely.
My settings are exactly as per my host's advice. The same settingas seed to work fine in MS Windows- I won't go there........
Long Day, I need sleep and will continue on this when I return from exercising tomorrow.
If I have any progress, I'll post it.
Salman