nslookup problem

[Mark Lo]

Hi,       I am currently installed qmail under my Linux box, everything is running smoothly until I have installed my firewall using ipchains.  The problem is that I got a lot of defferal messages stating that my CNAME lookup failure.       Also, I am not able to do a nslookup under my box, is that mean qmail can't use the name server to lookup CNAME name ???   Thank you   Mark