Postfix Mail Server: Going from “Stand-Alone” to HA-Cluster Administration

Hello,
How are you doing today???
I am trying to setup a Postfix Mail Server on Red Hat 8.0

I am trying to learn the basic process of setting up and manage a Postfix Mail Server.

Once completed, I’d like to learn take the setup and confiuration to the next step. “How-to” build a High-Available Postfix Mail Server set.

I have most of the equipment needed.
Is there ANYBODY up to the challenge???

Are there ANY suggestions, other than upgrade Red Hat.

Thank you,