I was really excited about the Junk Mail feature of the new 10.2 Jaguar Mail app. I thought it was working great, in that it was catching most everything, but it was all staying in my In-Box. No big deal, I just deleted it manually.
Apparently all this time I have been in training mode! I never realized that I had to turn junk mail filtering on! The menu option to do this is under Mail -> Junk Mail -> Automatic.
I'm sure this was very obvious to some, and they found this feature early, but if I'm guessing that there may be others like me that don't have it turned on.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021010053831930