Now you can find out when your email has been read by the recipient! No more guessing: “Has he or she read my email yet?”
SpyPig is a simple and free email tracking system that sends you a notification email as soon as the recipient opens and reads your message.
It works with virtually all modern email programs: Outlook, Eudora, Yahoo Email, Gmail, Hotmail, AOL Email and many others.
SpyPig is especially useful when you respond to a classified ad such as that on craigslist (for an employment, for example) and wonder if your email reaches its target.
but Both you and the recipient must use an HTML email, not plain-text or rich-text email.
to know more… click here