We'll need a bit more information to help you out here.
Mainly, what type of mail server are you trying to talk to. POP3, IMAP, MSExchange?
If you have LabVIEW 7, there are some built-in POP3 email vi's that you can use to send mail, but it doesn't look like they can take a user and password.
Maybe you could use ActiveX calls to your regular mail program if you're in Windows.
Feed us a bit more info and we should be able to figure something out.
Ed

Ed Dickens - Certified LabVIEW Architect
Lockheed Martin Space
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.