We are starting to move to a very simple, two server setup. The main server sits behind the firewall and is the LDAP and Mailbox server. The second system resides in the DMZ and is a MTA server.

What is the best way to accomplish this? Would it be possible to install the webmail, or a proxy for webmail on the MTA server? Or do I have to re-install the mailbox service and try to fix the oddities in storage, communication and mailbox storage.