If authentication is not required for the e-mails you are sending, PHP's mail function is pretty useful.
You can read the manual for the mail() function here:
PHP: mail - Manual
Basically, you stuff variables with the TO, SUBJECT, MESSAGE TEXT, and ADDITIONAL HEADERS and pass them to the mail() function.
Applying a reply-to header will let you include a real email address for reply's and so receivers know who the email is coming from.
Hope i've helped some...
if you have questions about the mail() function and the link i gave is not helpful, let me know.
Mike.
Not Just Graphics