I still run my own DNS and HTTP/HTTPS server. It's basically free of effort compared to what setting up and maintaining SMTP was (I used to do that on my colo because of the aforementioned, now I just point my MX records and escape the hassle). Hell, I even run my own ASN+BGP+IP space & it's easier than email was. Anything is doable though if you have a high enough tolerance of course, the centralized providers don't run on fairy dust!