STW - tell a friend scripts just grew up!

STW (Spread The Word) is a tell-a-friend script with a lot of differences. STW can contact email domains to make sure the domain names exist and can ban certain email domains to give you much more accurate results. The visitor can also opt-in to your mailing list at the same time, and be automatically added to your autoresponder. Custom email messages are sent, with the user able to add their own personal message. It tracks the users name, email address and IP address to cut down abuse. Allows an unlimited number of friends. Easy to use PHP script, and requires no database.