SpyPig is a free email tracking tool that notifies you as soon as your recipient opens your email message. It is dedicated to all those paranoid individuals out there who can’t stand wondering all day if their VIE (Very Important Email) has been read or not. This little email tracking tool will help you gain some of your sanity back. It works with virtually all modern email programs: Outlook, Eudora, Yahoo Email, Gmail, Hotmail, AOL Email and many others.
It has no spam, no virus, no adware, and no spyware. You can use it as often as you like, and there’s no catch. The system is very easy to use.