Answer
The question is ambiguous. Any internet server REQUIRES a fixed IP address – otherwise clients can’t find it. (It’s rather like a us having a fixed telephone number so we can
provide a service to our clients).
Clients can share a limited number of IP addresses on a “lease-back” principle. (We don’t care what the telephone number is of the phone our client calls us on – unless we have to call them back).
A server can provide a service which allocates IP addresses to clients for a definite period – this service is called DHCP (in this example, it would be the telco who offers telephone numbers to clients until the end of the service contract).
So NTMail can run on any server that is providing DHCP to others. But it can’t run on a client (since the IP address is not known).
Keywords:DHCP IP address fixed lease static