Aside from my personal opinion that all fixed assets like servers, printers and such should have static IP addresses…
I’m assuming that you’re using Dynamic DNS. Have you first resolved all DNS issues with respect to domains, MX records, server name config on the client machines and such?
From what I’ve heard, Dynamic addressing of servers can be made to work, but you’re asking for trouble if you try that.
Write back with more details of the setup. (To the group, not just to me)