Sophos Smarthost - Outgoing Interface + NAT


an XG uses a smarthost in the upstream to send and receive mails towards the internet.
My problem is that the XG sends outgoing mails already on the right interface, but here is a transfer network towards the smart host, which is private and not public, the upstream smart host knows no route to the IP that the Sophos uses.
I have already tried everything with NAT, but nothing seems to work here.

Help :)

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[edited by: emmosophos at 6:43 PM (GMT -7) on 18 Jul 2022]

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