How to manage service emails on multiple domains of one site?

Question

Email

Good afternoon!

We have changed the structure of the project, we

divide the site by products, for example , notebook.kom camera.kom
, the landing pages are different, but the backend is the same.

We want to make a domain for service and marketing types:

oneforall.email

Strictly speaking, the idea looks very successful.

I want to know your opinion for and against this method.