I'm throwing my notes on the following wiki page below as I play with my new esx server that was kindly sent to me. I've added other information there that allows all the 'test' domains to be fully functional when one is using DynDNS domain like one would from home. My DynDNS domain is wildcard for subdomains and also the MX records. The examples there allows one to setup 40 vm images with 40 zcs domains fairly fast.
Ajcody-Virtualization - Zimbra :: Wiki
I haven't had enough time to do a good proof read on it, so please excuse the mess there. Also, I need to revisit some of it to tighten down any security issues. Feel free to post any questions/comments on the wiki discussion page as well.