Track sent e-mails

I use a program called MSGTAG, which is available in free and paid versions. It tags all your sent e-mails and you will be notified when e-mail is picked up. It is not 100% successful, but on my computer succeeds at least 95% of the time. If e-mail recipients deny receiving your e-mail, it is easy to see if the tag was picked up.http://www.msgtag.com
Jacksonsaul