Duplicate entries in sent mail
My sent folder displays duplicate outgoing email in Thunderbird with every message I send from my Fastmail email account. It does not do this with two other accounts that Thunderbird handles.
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If, as it appears, fastmail automatically makes copies of every sent message, you should uncheck that option in Tools/Options/Account Settings, select the fastmail account in the left pane, then Copies & Folders 'Place a copy in...'.