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

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.

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