A message sent from one mailbox shows up a "sent" in a different mailbox.
Using Gmail on Thunderbird. I have 4 email boxes. Copy of mail sent from one box is showing up as "sent" in a different box. I have checked the setting in "copies and folders." All other boxes are behaving themselves.
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Do the Sent messages on the errant account show the expected "from:" address?
I think it's possible this account is using another account's smtp server.