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Local Drafts folder was slow then Thunderbird started resending all the emails in my sent folder

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Sending an email slowed right down, so I saved it and tried to open it from the Drafts folder, a local folder. Drafts was agonizingly slow to open a draft. (I tried this several times to send a particular email.) I clicked the Repair Folder button for Drafts. Then I clicked the Repair Folder for my local Sent folder. Bad move. Suddenly Thunderbird started resending all the emails in my Sent folder. Starting in 2020.

I had to disable my internet connection, then change my Sent Folder back to a server folder and disable my SMTP settings for the moment. Ouch!

Thunderbird doesn't seem to work well with local folders any more.

Sending an email slowed right down, so I saved it and tried to open it from the Drafts folder, a local folder. Drafts was agonizingly slow to open a draft. (I tried this several times to send a particular email.) I clicked the Repair Folder button for Drafts. Then I clicked the Repair Folder for my local Sent folder. Bad move. Suddenly Thunderbird started resending all the emails in my Sent folder. Starting in 2020. I had to disable my internet connection, then change my Sent Folder back to a server folder and disable my SMTP settings for the moment. Ouch! Thunderbird doesn't seem to work well with local folders any more.

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