Foriegn country IP's

Ok I have a few local forums that I am serving. I have no need for anything out of the country. I am having a hell of a time with spamassassin on my centos server running sendmail.

My Blacklist works great but the damn spammers only fake address once so that as I catch a spammer using the same address more than once I can't catch the first time users. Most of my spam comes from a different country. Does anybody know where I can get like lists of blocks of IP's that foreign countries use so I can block them while I figure out spamassassin?

I hope this makes sense to the right people.

I am getting barraged lately and it sucks.

Spam sucks crap!!

Country to IP database>
There are heaps on the net- try google.

http://ip.ludost.net/

One answer would be www.spamhaus.org