First I'll qualify this topic.... I know ISPConfig won't manage 2 servers on 1 installation. However I have someone who would like their own dedicated server on my system using my DNS. So I thought about it and came up with this solution... On my ISPConfig main server set up their web site pointing to an IP that is not on my main machine. Set the mail and MX records for that new machine to that same IP. Set up another server with ISPConfig using the above IP address. The NS records on that machine would point back to my DNS ns1 and ns2. Would this work? Would all email show as coming from their server and not mine? I know these are simple questions, but sometimes simple just isn't simple. And I hope I was clear enough with what I want to do.