cannot send from Outlook with NIS '05

On the laptop, I CAN RECEIVE, but CANNOT SEND and get this error message: The specified server was found, but there was no response from the server. Please verify that the port and SSL information is correct. To access these settings, close this dialogue, then click More Settings and click on the Advanced tab. Yet, the settings (mail.bellsouth.net) are configured exactly the same as the fully functioning older desktop which has NAV '02. The only thing I can think of is there must be a Norton problem or conflict. I tried for 3 hours to search the Symantec knowledge base and have tried just about everything they suggest, but nothing works, not even temporarily disabling Norton. Can I fix this myself, or should I give them a call?