[c0balt]

I own the domain and delegate hosting to a trusted, local provider with known human support. Of course it's also backed from my side up to avoid data loss.

If an issue occurs then I can call a human and will likely be able to regain access. If the company ceases to exist, I "just" need to reconfigure my DNS records and import my backup into a new provider. It's not the cheapest and certainly not free solution but it will be works for me, it has survived at least two migrations between providers.

I can highly recommend mailbox.org and mbsync. Fastmail and other providers who support custom domains will also suffice, pick your poison. If you want (human) support, be ready to pay a small bonus for it.