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Create the Static NAT

static (DMZ,Outside) <WAN_IP> <DMZ_SERVER_IP> netmask 255.255.255.255


Create the ACL

access-list 100 extended permit tcp any host <WAN_IP> eq 25


Assign the ACL

access-group 100 in interface outside


Reference

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080862017.shtml