Hi Tony,
At 15:01 06-07-2007, Tony Houghton wrote:
>I just use the one built in to my ADSL router; I don't know whether it
>caches. The one it forwards to at my ISP is probably bind.

The DNS server on your ADSL router is built for residential
usage. If you are going to do a lot of DNS queries, for example with
SpamAssassin, it is better to run a DNS server on the same computer
as SpamAssassin.