2 servers, one SMTP, can't figure it out

Hello,

2 Domino sevrer 8.5.2,

same domain,

same NNN,

notes routing working correctly between servers

I’m trying to configure one server as the SMTP server.

SERV1 will be the SMTP server for SERV2

Foreign SMTP Domain and SMTP connection are needed when Domino servers are in different domain, in my case, they are in the same domain.

What do I need to do?

Thanks

Subject: SMTP forwarding inside domain

Put IP address of SERV1 in configuration document of SERV2 in space for Router/SMTP Basics, Relay host for messages leaving the local internet domain.