That's fair! I didn't know they were offering that. I think it's a recent development -- it's not generally available ("contact us"), and it seems more focused at enterprise-type deployments than end-user mail that your typical Fastmail/Protonmail/etc.
But for the original question:
> Is there any email hosting out there with support for JMAP?
Stalwart really isn't a practical answer, at least yet.
Couple of my friends that work for IBM told me that it still needs a lot of work because researchers that take blind tests can almost always tell apart the cold, inhuman responses that are devoid of any human decency from the responses generated by the computer.
