Same problem for me. I have followed http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04-p3
You probably forgot to add the NS records to the zone. On the domain in question click "add new record," type=NS, data=ns1.yourdomain.com....
I installed module-init-tools on vm01, rebooted and receive the following: vm01:~# iptables -L iptables v1.2.11: can't initialize iptables...
I took the compile-your-own-kernel route and iptables is not working on vm01. This is what shows on dm0: dm0:/# iptables -L Chain INPUT...
Separate names with a comma.