I currently am NAT'ing all RFC-1918 addresses out the firewall to the Internet. However, I want outgoing mail to appear to originate from a different IP.
So, 10.0.0.1 NATs out as 220.127.116.11
10.0.0.2 (a mail server) should browse Internet appearing to be 18.104.22.168
10.0.0.2 should connect to remote tcp/25 appearing to be from 22.214.171.124
Any way to accomplish this?