Comment by mkenyon

I love JMAP. It's what allowed me and my team (at 1Password) to easily add support for Masked Emails, where we randomly generate your email address in addition to your password.

Our own Madeline Hanley wrote about that experience, if you'd like to see what it's like to work with JMAP: https://blog.1password.com/making-masked-email-with-jmap/