Usually when all sent items are missing from my PC Windows 10 Mozilla Thunderbird, what I did is I deleted the IMAP account.
And then after re-add my IMAP account, usually all my inbox, drafts, sent items, etc will come back.
And after a short while, sent items will be empty again.
Could anyone help me, what is wrong ?
This only happened specifically in my PC mozilla thunderbird email client, it does not happen in my ipad or android email client.