macosxhints – Run a caching-only name server
Using the article above, I set up a caching only name server so that the mailserver, the rbl checks, and spamassassin network checks could use a local dns server. Instead of using the version of BIND that shipped with OS X 10.3, I downloaded the latest version of BIND, 9.3.1, and installed it with the instructions above.
With some web browsing and running Dig through the Terminal, the local caching server appears to run very quickly.