I knew it had been a few years since I switched to my own mailservers, but I was still surprised to find that it has been nearly four years.
My first production MX went online on August 2, 2013. Since then, I’ve switched over my dozen or so domains and their few-hundred aliases without incident.
It takes a significant amount of my attention, but I can’t see myself giving up the flexibility it affords me. More about my setup is available at https://ethitter.com/tag/mailserver/.