And I thought outlook (live.com)'s spam filtering was bad. It just doesn't seem like it should be that hard of a problem to solve - there's almost no case as a

And I thought outlook (live.com)'s spam filtering was bad. It just doesn't seem like it should be that hard of a problem to solve - there's almost no case as a human I can't instantly tell that an email is spam or not-spam and give a concrete reason why. E.g. almost any email that uses my real name in the greeting isn't spam, and certainly one that's a reply to an email I've sent, yet I've seen examples of both end up in junk folders. It's distinguishing important emails specifically written to me providing key info or requiring my response vs mass-email or automatically generated email that I would think is a harder problem, but live.com seems to do it moderately well. If Thunderbird does auto categorization well that'd be reason enough to try it out (but where does the categorization execute, if you're using it from multiple devices?)