>I've replied to some of the spam with threats that I will track them It has to be more expensive than that. What I found effective is calling ISP and complaining over phone to higher-level staff (look in contact pages and pass the secretary :-) No threats, but followed up with others complaining about the same thing (we have a sort of call-ring :-) This is, of course, for continuous spammers, no one bothers with one-timers.
