Just for kicks and helpfulness, I tested...
mail.bellsouth.net has a POP3 service running (port 110) but does not appear to have an SMTP service running (port 25). Unless they run on some super secret special SMTP port that their customers know of.
Edit: Log:
Code:
~]$ telnet mail.bellsouth.net 110
Trying 204.127.217.17...
Connected to mail.bellsouth.net.
Escape character is '^]'.
+OK (frfwpxc01) Maillennium POP3/PROXY server #824
Code:
~]$ telnet mail.bellsouth.net 25
Trying 204.127.217.17...