For the most part, if backbone sites had taken spam seriously a decade ago, it would never have become a problem. The reason we have spam today is mostly because major backbone sites are not willing to disconnect customers who provide service to spammers.
Just refusing service from the two largest Korean ISPs would probably cut down spam by half. But there are plenty of backbone sites peering with them.
The vast majority of spam comes from a fairly small number of people. If everyone here went out and shot someone on the ROKSO list, there would be no spam problem at all.
--scott
"C'est un Nagra. C'est suisse, et tres, tres precis."