How to send emails from another domain?

Question

Domain Name System

Hello!

Please help me with my question!

Given:
There is a fairly large company with an already working and configured domain "X" (website, mail, AD, etc.). The company plans to open an independent subsidiary, respectively, a new "Y" domain will be registered, which has nothing to do with it.

To save money, it is planned that the subsidiary will use the infrastructure of the parent company, including its Exchange server.

Question. How to set up sending mail using the main company's existing Exchange, so that mail would go from under the "Y" domain and not "X"?

Google has something similar, by default mailboxes are in the @gmail domain zone, but you can link your domain and send from your own domain zone, i.e. the recipient will not see that it is gmail by the body of the letter.

Thank you.

Answer 1

I have done this: added a domain name to Ex, created connectors. Further in AD, I made a container in which the entire structure of the subsidiary company Y will be located and configured the address policy in such a way that when a user is created in this container, he would receive an address with the domain of company Y. The disadvantage of this solution is that you cannot make two mailboxes with the same name n.r. [email protected] and [email protected] since the same logins are not allowed for users in the domain. It is treated by adding an additional e-mail address in the EX mailbox settings or, by the scheme, the login in the domain is not equal to the name of the mailbox in the mail. But it's not pretty. The correct solution is to deploy a separate forest in a domain, adding a trusted domain or something similar.

Answer 2

Add a domain to the mail server. A large company has administrators for this.