Support of JMAP
"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)." (http://jmap.io/)
Sounds good to have it ASAP it is released.
Thank you for your input! We will consider this functionality in upcoming releases if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
Alexander Yamshanov commented
Currently, this protocol in draft stage (https://datatracker.ietf.org/doc/draft-ietf-jmap-core/) and it will expire on September 29, 2017.