[Staffslug] Zimbra mail server

Hello folks. You may have seen my post re Endian Firewall. I have a separate project that I'm working on, which is to install a new mail server in our office. Currently we all have POP mailboxes, which is a rubbish solution for a busy office - especially when we want to route some addresses to multiple recipients. With my limited knowledge of Linux, I've looked at a few solutions and the best one I've found is Zimbra. If you haven't seen it before, have a butchers at the online demo of their webmail interface... http://www.zimbra.com/products/hosted_demo.php The webmail client is a big plus point for me because it means that I can get the users to ditch Outlook etc without complaints. I have installed it on an old PC (on top of CentOS). After ages messing around with DNS settings, I finally got it to install, but it still doesn't work correctly. Because we're behind a NAT router, I think I need to configure split DNS. I haven't managed to get this setup correctly yet. Has anyone here set up a split DNS scenario before? Cheers Al