One mailserver with multiple domain hosted eleswhere


I am creating a mail server which will send on behalf of other domains. So how could I do it. I have setup one mail in box server as root mail server and it works fine. Now I want to send on behalf of the other domain.

You can see here

Message : “You may not make a user account for that address because it is frequently used for domain control validation. Use an alias instead if necessary.”

So is there any possibility using mail in a box ?

Thank You

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