I have a very small (on the side) hosting business that has been running for almost 6 years now and growing little by little. I have direct contact with my clients and they have it with me in case of need (if they need technical advice or support not necessarily directly related to the services).

And this is exactly the kind of service they were looking for, very difficult to have with a massive business company (have you ever opened a ticket with OVH?)

Then of course, the technical challenges to setup and maintain such services are high and a control-panel all-included package or a docker with everything in it is just a very small part of the work required.

Self-hosting email or self-hosting in general?