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My sent email messages are saving twice in my sent folder. How do I stop this?

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When I send an email in Mozilla Thunderbird it saves in my sent folder twice. How do I stop this and is there an easy way to remove the duplicates once I do?

When I send an email in Mozilla Thunderbird it saves in my sent folder twice. How do I stop this and is there an easy way to remove the duplicates once I do?

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Go to account settings for that account and under Copies and Folders tell Thunderbird to stop saving a copy.