On an average day, 3,117.88 spams + viruses are sent to me.
1.60 are only caught by one of my spam filters so I feel a need to check for false positives.
0.27 make it to my inbox.
In order of decending wonderfulness:
Yes spamprobe is definitely better than spamassassin, and it's pure (multi-word) bayesian.
pleased
I know that my mail client has spamassassin, I'm not sure about greylisting. It sounds like a good approach though.
I recently went from roughly 0.5 to about 6, because I was geting roughly a 1 false positive rate -- one content-ful email in my junk folder per day -- which was awful. Now the false positive rate is indistinguishable from 0, but the false negatives are up to 6, above.