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Why is Thunderbird is sending all my emails twice?

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I see in my Sent Folder that Thunderbird is sending all my emails twice.

I see in my Sent Folder that Thunderbird is sending all my emails twice.

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Are you using gmail ?

If yes, then gmail will auto put email into Sent folder. If you also have Account settings > Copies & Folders set to save sent email in Sent folder, then Thunderbird will also put copy in sent folder. In which case you need to uncheck the checkbox 'Place a copy in' and click on OK. Then restart Thunderbird to ensure settings are being used.

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Using Hotmail, but probably same thing. Will follow your directions. Thank you.