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Section 3.10 of RFC8620 scares me. I know a lot about that and a lot of the complexity around that trite point is missing.

Note I've designed and built a complex messaging system that runs over HTTP over unreliable connections and run it in production for 15 years so I know what can and does go wrong.

Popcorn at the ready.




It’s not as if Fastmail haven’t run JMAP in production at a pretty big level for quite some time by now.


And I dumped them because their client was buggy, doesn’t work offline on mobile devices and I had to use IMAP anyway…


> doesn’t work offline on mobile devices

To some degree, that isn't true anymore as of last week but of course, you meant when you used it, not generally: https://www.fastmail.com/blog/offline-in-beta/


Oh so some of it works offline.

Useless to me. Seriously.

I write a lot of email on planes and do a lot of email management.

All that works on the default Apple stuff as shipped other than account management. Using IMAP and iCal etc.


Have you looked at their list of what doesn't work offline? It seems like it's mainly attachment management limitations than limitations of managing the emails themselves.




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