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My yahoo email is sending duplicate emails after Firefix 9 upgrade?

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I have my Mozilla email forwarded to my yahoo account and when I reply to an email or initiate an email, it is sending duplicates. How do I fix?

I have my Mozilla email forwarded to my yahoo account and when I reply to an email or initiate an email, it is sending duplicates. How do I fix?

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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