First, as SwellJoe pointed out, a couple of times a year is not a big deal. Blacklists have also proven quite effective in pressuring ISPs to clean up their ac

First, as SwellJoe pointed out, a couple of times a year is not a big deal. Blacklists have also proven quite effective in pressuring ISPs to clean up their act - they can still ignore bots/spammers/assorted morons, but they will soon find themselves unable to send e-mail, and hence, without legitimate customers. I admit there's some burden on the well-meaning, but it makes life a lot harder for spammers and spam-abiding ISPs.