Check out http://www.rightinbox.com http://www.rightinbox.com Right Inbox puts a small invisible image in your email. If the recipient’s email client does not

Check out http://www.rightinbox.com http://www.rightinbox.com Right Inbox puts a small invisible image in your email. If the recipient’s email client does not particularly block remote images, then tracking takes place. Plus, if you include links in your email, they are also included in tracking. If the recipient clicks a link, then it is notified to you regardless of their email client or so.