An idea to build an email solution with 3 domains

I’m planning to make an email solution, like Gmail, and with 3 domains, users could choose from or, how could I install MIAB in a server connect all the other there domains and allow users to make an email?

I am also looking for some similar. First of all will like to thank all the contributor to this software. The easy of deployment is fantastic.But how can I make use of mail in a box, with over 10,000 email box.

Is mail in a box scalable. If yes please how do one go about it.

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