I just finished bulk-marking them as “not spam” in an attempt to undo the work, and I always check my spam inbox manually anyway, but I just thought this was… interesting, as I’ve never had anything remotely like this happen before in my life. Does anyone have any idea of how this happened? Why is such a piece of software still allowed in managers?
I can’t speak about Evolution specifically, but I know Thunderbird has a built in filter and instructions state it learns based on your choices. Thus it flags many messages as possible spam, and you as the user can correct that “guess”, which helps train it. It does not automatically sweep those guesses into the spam folder.