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How do I track if a sent e-mail has been opened?

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Mr X sends an e-mail to Mr Y; How can Mr X know if Mr. Y has opened the e-mail?

Mr X sends an e-mail to Mr Y; How can Mr X know if Mr. Y has opened the e-mail?

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Firefox doesn't do email, it's strictly a web browser.

If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.

If your problem is with Mozilla Thunderbird, see this forum for support. http://www.mozillamessaging.com/en-US/support/
or this one
http://forums.mozillazine.org/viewforum.php?f=39