Since nobody bothers to check previous posts (even from just a day or two ago), I won't bother with the details. All I will say is to learn the purposes of an MX record and how sending email works (and the differences). Hint: MX records have nothing to do with sending emails from your server. Just use a third party SMTP service in your config.hjson file.
Oh I read plenty posts. I am no expert so not always easy for me to understand relating their experiences to mine.
I was under the impression that postfix is all that was needed. And my config.hjson file is pointing to postfix. The issue that caused me to get confused and go down a very incorrect rabbit hole was that the postfix logs repeatedly error about connecting to my Mx record servers.