Thunderbird 115.12.2 (64-bit) on Windows 11: For some time I've had a simple filter that moves anything from a sender not in my address book to a "Limbo" folder. I can then review Limbo and re-file anything I want to keep. This seemed to work well for a while. But recently, when Thunderbird syncs with the IMAP server, it re-downloads all the re-filed messages and apparently considers them new. The filter runs again, and ''despite nothing being in the Inbox'' everything I had re-filed ends up back in Limbo. I don't know what to think: * Did a Thunderbird update change its behavior? * Did something change on the IMAP server I'm connecting to? * Is this by design, and my filter setup should never have worked to begin with..?