Well as you may know VE's (Virtuozzo virtual servers) don't like iptables too much, and I need to block a couple of countries who has never produced anything by spam for me - china, korea, taiwan for starters.
As you may also know they rarely use their real .cn, .tw and .kr as the mail sender.
blackholes.org seems to be dead so my only option is to block their ip ranges.
Come on, there must be a way to do this? It's so commonly used on all platforms?!?!