Here's what you need to do for dns
http://www.zimbrablog.com/blog/wp-co...6/zonefile.png
Also for your host file change
127.0.0.1 localhost.localdomain localhost
Restart the dns server:
Ping the server: ping domainname.com; ping localhost;
dig mx yourdomainname you
Now install Zimbra
Change the Admin password
select "a" to apply changes and it will start all your services for you.