At first, I was lazy. I used Google's Gsuite for sogubsys, piggy-backing off sogub services. It was a hack and I didn't feel good about it. Fortunately, in a tech-kern post Mouse stated that he couldn't or wouldn't receive emails that include a Gmail path. Thanks, Mouse. That simple statement was enough for me to do what I actually wanted to do: run my own MX and handle my own mail. I've done it before, but it was a long time ago.