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canceling emails

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I daily receive numerous "postmaster failure to deliver" messages from a very old message which never delivered... and many of my contacts receive the same prompt... It cannot be stopped and keeps hitting many accounts on a daily basis

I daily receive numerous "postmaster failure to deliver" messages from a very old message which never delivered... and many of my contacts receive the same prompt... It cannot be stopped and keeps hitting many accounts on a daily basis

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Firefox doesn't do email, it's 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