Most email should have a static IP address and if they don't, then it isn't hard to get a machine to use a router or a Google DNS server to relay DNS requests.
If the mail server is internal, use the internal DNS server. If it is external, then use 8.8.8.8 (Googles Public DNS Server) as a secondary DNS server setting on the machine.
Internal DNS can be found by going to the command prompt and typing in "ipconfig /all" (without the quotation marks) and that will give you everything that a computer uses which you can then use on the copier except for the IP address that the computer is using.
Better still is to use a DHCP reservation for the copier so that all that information is automatically gathered by the copier along with the same IP address everytime.
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