DMZ and Port forwarding

Question, in preperation for an Exchange migration, our current exchange 5.5(x.x.x.5) is setup on the DMZ network. The Sonicwall firewall, also our dhcp server, has the IP range of x.x.x.5 to x.x.x.25 as the DMZ zone. Now if I wanted to take x.x.x.5 and turn on port forwarding for SMTP how would that work? Since x.x.x.5 is in the DMZ, isnt this already exposed to the public internet?

Should I remove this range from the DMZ scope and then add x.x.x.5 as rule for port forwarding? Any advice would be appreciated. Thanks!
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>> Since x.x.x.5 is in the DMZ, isnt this already exposed to the public internet?
Yes, so if  you move it out of the DMZ, then forward the port to the internal ip of the server (not the external)

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If it is in your DMZ then it should already be open to the public.  You should not have to do port forwarding unlesss you move it to your private network.
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