JMAP is on the home straight

https://fastmail.blog/2018/12/27/jmap-is-on-the-home-straight/

Highly recommend to read the Dec 2014 post on what JMAP attempts to solve: https://fastmail.blog/2014/12/23/jmap-a-better-way-to-email/

UI changes on FastMail, making use of JMAP: https://www.fastmail.com/help/guides/interfaceupdate-2018.html

The JMAP spec and documentation: https://jmap.io/