If you are connected via WiFi on your own router it may not require a username and password. If you are using EDGE or some other WiFi network it then will not work, because bellsouth does not have an authenticated server accessible off their network.
When using EDGE you can send mail by putting "cwmx.com" in the SMTP (outgoing) mail server, with NO username or password. But this will only work with EDGE, not on any WiFi network.
When using non-BellSouth WiFi networks neither of these will work.
Thus, this is not a good solution as you must either change the outgoing server based on where you are or put in CWMX.COM and turn off WiFi when you want to send mail.
An alternative solution is to open a gmail account, set it to retrieve your BellSouth email (that's an option in Settings) and use the gmail SMTP server for sending. This will work on any WiFi network or on EDGE.