Didn't know there was a Thunderbird version, though.

If so, kewl beans.

I use server-side SA and Apple Mail's built-in junk filtering to catch that which SA misses (image-based stock spam seems to be the merde du jour). Get one or two a day which get through. I probably need to drop the SA score, though; I'm currently junking at 5.00, and 4.00 might be a better bet.