7) Scroll down to the Outgoing server and fill in the MSN information.

Webtv does not come with an smtp server. MSNIA or Premium has it if you get it enabled.

If you have a POP3 enabled MSN account you can use that in the following manner:

8) When you are finished, save changes and click done. The POP3 mailbox will appear in your msn9 folder list in mail:

9)When Sending mail in this manner, you may now choose your POP3 address as the FROM address: