Thanks guys, sounds like you've armed me with the info to sort it out. I'm at a remote site where I don't have access to port 7071 for the web admin access, so I'll have to finish this off later. I really appreciate the help and look forward to showing zimbra to others.
And I can't wait till it gets debian friendly!
Boby, I'll have to check out bind a bit closer I suppose. I must admit I've only ever managed a dns server from a windows environment. Obviously I've got a bit to read up on.