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