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E-mails are duplicating in my "Sent" folder. How can I stop this?

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Certain e-mails are duplicating in my "Sent" folder every few seconds. After I delete them, they continue to duplicate -- even after I delete the original e-mails.

Certain e-mails are duplicating in my "Sent" folder every few seconds. After I delete them, they continue to duplicate -- even after I delete the original e-mails.

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How is that related to Firefox support?