Domains don't listed on Email Routing Screen

Hello guys.

Please, on the screen Email Routing (remote/local) we dont have all our clients listed. I need to change an email routing to an GSUITE client and didn't working. I think is becouse of this. This specific client is not listed on that screen, only a half of our clients are listed there.

Could anyone help me how to solve this? Many Thanks.

There is a very simple solution.

Create an emaill in the domain and then go there in the email routing that the domain will be there

Server Solutions 

Rodrigo