DNS setup on a mail server

[Vanco Ordanoski]

I have the following configuration:
- e-mail server (no web server) (IP 212.13.68.2)
- primary/secondary dns is my isp (212.13.64.2)
- sendmail and pop3 daemons
How do I setup my dns for caching only?
With mail relay blocking on, I keep getting messages of sending mails in circles.
If possible, I need the files in /etc and /var/named
Thanks
I am using RedHat 6.2

[Bryce Dunn]

There is a very good howto about configuring a caching only nameserver at:

http://www.linux.org/docs/ldp/howto/DNS-HOWTO.html

This should provide all the information that you need.