Add JMAP support (as an alternative to IMAP + SMTP, and later to CardDAV/CalDAV)

[michalbundyra]

"JMAP is intended to be a new standard for email clients to connect to
mail stores. It therefore intends to primarily replace IMAP + SMTP
submission. It is also designed to be more generic such that it can be
extended with contacts, calendars in the future (replacing
CardDAV/CalDAV). It does not replace MTA-to-MTA SMTP transmission."

http://jmap.io/

You may wonder "Who uses or supports it?"

Cyrus IMAP and Apache James are the notable ones here:
http://jmap.io/software.html

OpenPaaS is an open source Entreprise Social Platform which is led by
LINAGORA (which has more than 150 employees)
https://linagora.com/
http://www.open-paas.org

OpenPaaS is using Apache James. And you can see JMAP used in the code:
https://github.com/linagora/openpaas-esn/search?utf8=%E2%9C%93&q=jmap&type=

In this video: https://www.youtube.com/watch?v=2QZIi3EO6rQ , Benoit
Tellier explains why they decided to invest in James and JMAP (among
other things). LINAGORA has 5 full time employees which are devoted to
the project.

Why LINAGORA picked JMAP:
https://medium.com/linagora-engineering/you-cant-do-imap-in-the-browser-can-you-208838b0ba17
https://medium.com/linagora-engineering/openpaas-newsletter-march-2018-c0a3e469e83e
https://medium.com/linagora-engineering/openpaas-is-out-773704eadfbc

FastMail started this initiative:
"JMAP is FastMail's protocol with the warts removed. We leverage
existing standards like HTTP, JSON, and native push channels on
platforms which have them - making it easy for developers to work with."
https://blog.fastmail.com/2016/12/22/cyrus-development-and-release-plans/
https://blog.fastmail.com/2016/12/12/why-we-contribute/
https://blog.fastmail.com/2016/12/09/jmap-test-suite/
https://blog.fastmail.com/2015/12/23/the-jmap-momentum-builds/
https://blog.fastmail.com/2015/08/11/an-open-source-jmap-proxy-javascript-library-and-webmail-demo/
https://blog.fastmail.com/2014/12/23/jmap-a-better-way-to-email/

Roundcube Next will support JMAP as well.
https://github.com/search?q=org%3Aroundcube-next+jmap&type=Code

Thanks!

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Originally posted by @marclaporte at zendframework/zend-mail#201

[michalbundyra]

We started https://github.com/WikiSuite/zend-jmap at the http://wikisuite.org/July-2018-JMAP-IETF-Hackathon-in-Montreal

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Originally posted by @marclaporte at zendframework/zend-mail#201 (comment)

[alexmerlin]

Closing issue due to being inactive for more than 1 year.

[marclaporte]

Since laminas-mail is abandoned as per #269, it's appropriate to redirect community members to other ressources.

I made the original request to zend-mail/laminas-mail in 2018 to help grow the JMAP ecosystem. I made other suggestions like roundcube/roundcubemail#5918 and we experimented here: https://github.com/WikiSuite/zend-jmap

In the end, we put our energies in https://github.com/cypht-org/cypht. I "conclude Cypht is the first/only Open Source standalone webmail client supporting JMAP" (PHP or otherwise). Source: cypht-org/cypht#180 (comment)

And I invite everyone to work towards adding/improving JMAP support in all mail servers and clients.