In your store administration area, go to the "Main Settings" page and set it up like this:

E-mail object
should be set to CDO

SMTP Server
should be set to 127.0.0.1

Username
Password
These next two boxes should contain the full e-mail address and email password of any full account that you have set up on your domain at ServeLink, it does need to be a full account with a mailbox rather than an e-mail alias or redirect. 

To test the mail sending simply use the "e-mail a friend" function to send a message from one of your product detail pages.