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How to get Sendmail to relay only to specific domains for a particular client IP

How to get Sendmail to relay only to specific domains for a particular client IP

How to get Sendmail to relay only to specific domains for a particular client IP

(OP)
Hi All,
I have Sendmail behind a firewall which port forwards port 25 (SMTP) to the mail server. Connections from the Internet acquire the "internal" IP address of the firewall, so in all respects they are "local"
My problem is that if I REJECT connections from the local IP of the firewall, then no incoming mail is delivered. But with my blanket RELAY for the local subnet, I have setup an open relay.
How do I fix this? I can put up some of my config files (relay-domains, access, etc).
I think the best solution would be to allow the IP of the firewall RELAY only to the two internal domains I have on the Sendmail server, but I don't know how to achieve this.

Sendmail version is 8.14.x

Thanks!

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