After Thunderbird September update, all messages from one of my accounts go directly to Delete folder.
This problem happened after the September update. No changes to any message filters. I am not the only one having this problem. What changed in the update that could have caused this problem? I have had to delete the problem account from Thunderbird because every time I move the messages back to the Inbox in Outlook, Thunderbird would move them back to Delete.
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There was a change in the way filters work in ver. 155, where a blank condition now matches everything where it used to match nothing. You probably had created some filters with empty conditions.
This will be reverted to the previous behavior in the next update, due very soon. For now, you can disable any filters with blank conditions, or fill in the blanks with relevant text, or live with it until the update.