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If you want to try out JMAP on a provider that is not FastMail, you use a proxy:

https://proxy.jmap.io/

I've not seen it deployed anywhere else yet as a production thing, and I don't know how much progress has been made on standardisation of it, but it does seem to offer vast improvements over IMAP.

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The proxy is a pretty crappy Perl JMAP server layered on top of a middling quality IMAP sync layer. The CalDAV/CardDAV bits are a bit better because it has nicer synchronisation primatives, but it's still code I slapped together over a couple of weeks of evenings. It's fine for playing with, but I wouldn't try to use it for large mailboxes. There's not much optimisation in there, it's doing pretty basic sqlite queries against a fairly normalised database, so there's no denomalisation for efficiency.

Do Fastmail themselves let you use jmap to connect now? They didn't a while back but I haven't checked recently.

I was looking for a way a week ago and couldn't find it, but maybe it's just hidden really well.

Not yet, though it's being used internally for a few things already.

The ietf working group and the Cyrus IMAP source code are the most up to date right now. I'll be updating the proxy (perl, open source) soon.

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