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Whenever I receive or reply to email from certain email addresses, Firefox adds a lot of extra lines to the reply. Why does this happen and how can I stop it?

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It does not happen to every email address and there is no pattern (i.e., all from one browser or email client). When it does happen, text does not wrap around the screen window either.

It does not happen to every email address and there is no pattern (i.e., all from one browser or email client). When it does happen, text does not wrap around the screen window either.

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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