I have a Mac Mini Server (named Server) with the following DNS setup

Primary Zone: example.com
   mysql-host.example.com machine (10.0.0.101)
   server.example.com machine (10.0.0.100)
   server.example.com nameserver (10.0.0.100)
   www.example.com machine (10.0.0.102)

www.example.com is a linux box with Apache. How do I get both example.com and www.example.com to work. Right now, I can view my website with www.example.com only. I know there's nothing that points example.com to the IP, but when I create a machine record without a hostname I get an error (This machine record cannot be created without a host name.).