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Thunderbird is duplicating my sent messages in my sent folder

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Duplicate messages show up in my sent folder outlook.com, however only 1 email is sent. How do I change the setting to prevent this from occurring?

Duplicate messages show up in my sent folder outlook.com, however only 1 email is sent. How do I change the setting to prevent this from occurring?

Chosen solution

That's because your provider already saves a copy. Go to Account Settings-Copies & Folders and tell Thunderbird it can stop.

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Chosen Solution

That's because your provider already saves a copy. Go to Account Settings-Copies & Folders and tell Thunderbird it can stop.

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Bingo, thanx for you help

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Go to Account Settings-Copies & Folders and tell Thunderbird it can stop. Where is Copies & Folders?

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That looks like the Options screen not Account Settings.