If you can receive e-mails but not send them it means that you are correctly configured for the inbound transfert, but that your outbound configuration have some problem.
You use the SSL protocol on port 25. Maybe your ISP don't support that protocol. Some demand that you use SSL, other just don't support it.
Looking on my side, SSL uses port 465, not 25.
Some other servers use port 587.
Double check that you use the right port. Correct it if needed.
Contact your provider to make sure you use the right port and protocol.
Normaly, you should have something like: mail.domain.com
set as your server.
Then, something like:
mail.domain.com
OR
smtp.domain.com
set as your SMTP server.
Electro, May 2011