I was relying on a couple lists at blackholes.us to block a lot of spam. But the server is down without any news as to why. When I can’t use the blackholes.us blacklists, my spam triples.
I found a replacement list to use at okean.com, but they don’t have a DNSBL, so I have to figure out how to best integrate their list with klunky sendmail. Anyone have a tutorial?
Update 2005-09-30: I recently found countries.nerd.dk and I’m trying out their DNSBL. Yesterday it blocked a couple hundred spams from the countries I specified.