Just an <OT> response.
I've enjoyed reading about all the ins and outs of spam and methods of avoiding same, but I solved my problem about 8 months ago by getting a Gmail account. Gmail has excellent spam detection and isolation facilities, and all I have to do is scan the folder once a day to check for false hits (about 2 per week) and then whack the spam with 2 keystrokes. On the other side of the fence, I find that a few bits of spam make it to my inbox every few days, but once I mark that as spam, the spam filter learns quite quickly, and I don't see those type mails getting through again.
One interesting side note, 99.7% of all my spam comes from mail automatically forwarded from my comcast.net account. If I were to unhook forwarding those accounts, I would be almost spam free.