It has to be either the final destination for the email addresses you are sending to or it has to be set up to relay for you. Usually your ISP has a relay for you to use. If you have a local mail server and you are sending to mailboxes on that domain then use that.
Does your firebox support 1:1 or One-to-One NAT ? If so remove your current NAT config from the dynamic or inbound NAT config and add a rule with the outbound IP pointing to an IP in your DMZ or LAN. This will NAT not only the incoming packets to your server but also will NAT the outgoing...
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