alt Hacker NewsI got the same capabilities from mxroute.com, another worthwhile alternative - hosted in the USA. Plus they offer a no subscription, 10GB one time fee (I think $150 at the time I got it) account...unlimited domains/subdomains, etc -everything managed thru directadmin. Replaced my Google Workspace email w/this and never looked back. I still use Google for authentication and Google Drive.
The sustainability of this is dubious to me because you're taking a one time fee for service forever, and eventually someone (possibly a future owner) is going to want to get more money out of you over this. Also, there are recurring costs to host this that continue forever, even with no further income from you.