Check with your ISP if your SMTP access requires username and password; I
know Bellsouth does.
If they do require identification do the following:
Open Outlook
Goto Email Accounts
Select "View or Change existing e-mail accounts
Click on the appropiate account and then click CHANGE
At the next window goto "More Settings"
Now select the "Outgoing Sertver" TAB anc enable the box next to "My
outgoing server (SMTP) requires authentication.
Exite by OK, NEXT, FINISH.
Hope it helps