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Q. Wouldn't it be a good idea to run a local nameserver anyway? So, you can run caching-nameserver to cache blocklist query results.
- Yes! A very quick simple solution is "dnscache" from djbdns: http://cr.yp.to/djbdns/install.html
You can probably find a package for your favorite *nix. In FreeBSD you can either "pkg_add -r djbdns" or "cd /usr/ports/dns/djbdns && make install clean".
Q: Does anybody know of a good way to use the cluecentral.net country lists? I'd like to penalize certain countries from which I get a lot of spam and almost no real mail. I can't seem to get it working with multiple countries: http://www.cluecentral.net/rbl/showcountries.php