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Thunderbird is duplicating my outgoing (sent) email, why?

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My sent folder displays duplicate outgoing email messages in Thunderbird, why? How do I correct the duplicate messages from happening?

My sent folder displays duplicate outgoing email messages in Thunderbird, why? How do I correct the duplicate messages from happening?

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Click with right button mouse on Sent folder >> Properties >> Repair Folder

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I'm having this issue with Hotmail, tried the repair but that did nothing. Any other suggestions?

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for some reason (copies/folders) place a copy in sent folder on under the account properties has to be switched off with hotmail accounts. strange as this is set on for my other accounts.