If you look in the "Code Library" (look at the top of this page!) under "networking" you'll find a class that I've worked with (started about a year ago) that allows you to send e-mails thru any SMTP mail server.
I have an improved version that I've (almost) tested thoroughly that I'm about to release, with some performance tweaks, and imroved error handling.
In order to help any more, I'd need some more details on your situation...
-Ben