[yohannparis]

Or maybe... FastMail created JMAP, ergo they are the one with the best implementation. Now Apple is working on moving iCloud to JMAP, and are working with FastMail as a JMAP production level service within mail.app.

[admdly]

Apple uses a proprietary IMAP extension that, until recently, any developer could use by generating a APNS certificate using a reverse engineered endpoint from macOS Server. They’ve since closed this.

Fastmail have had sanctioned access from Apple (via their own APNS topic ID) - https://www.fastmail.com/blog/push-email-now-available-in-io...

[whazor]

There were some changes last week to the JMAP Email Delivery Push Notifications[1], so that could be related.

[1] https://github.com/jmapio/jmap/commit/1335683f8b542c71bc41a4...

[mpercival531]

How iOS Mail gets push inbox updates working with third-party IMAP servers is in the public since 2015/2016 if you look hard enough. That has nothing to do with JMAP the protocol inherently.

[solarkraft]

I know you said „maybe“, but this is how rumors begin.

I can not find any reference to Apple having any involvement with or interest in JMAP (as much as I’d wish so).

[jarland]

The stock Mail app for iOS does not support JMAP.

[1over137]

Your alternate theory doesn't pass Occam's razor given Apple's general behaviour. Do you have any evidence?

[yohannparis]

None, that's why I started with "Maybe...". I'm spitballing here and try to exchange ideas with other people interested in the topic to debate it.

I love every answer my comment received!