Sending a Receiving on Multiple Domains

I am starting a new build and trying to get an email server setup while using five or more domains. I found one setup help that talked about establishing multiple mail.X.com domains, but is that all that’s needed in order to create emails for those domains?

Your link is broken @CWSmith1701

All you need to add multiple domains is to add users/aliases for those domains and then add the requisite DNS records to those domain’s DNS providers. The records are found on the “External DNS” page of the admin area.

Yeah, the link I put was just a placeholder type link, not actually meant to go anywhere.

I’m working on the DNS, I use cloudflare for my DNS records, especially since this will be a multi-system address as I’m putting the websites on a different VPS eventually.