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.
Oliver Lippert
shared this idea
3 years after its invention support of JMAP is limited to "experimental" support in a rare number of software products. As Plesk does not provide mail server software themselves, but merely is a comfortable user interface to such software, JMAP will not become a reality in Plesk itself, but maybe in Postfix, QMail, Dovecot or a then new mail daemon application on servers some day in the future. In that case we'll be happy to review this topic again. But for now, it is just nothing that is close to becoming a reality on the web, neither are there suitable server software packages for which a user interface could be developed. For these reasons we must decline this request.
-- PD
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Glenn van Es commented
I was going to say if clients starts to support JMAP Plesk should certainly get it, but I think we should see this the other way around; if JMAP becomes a standard, it would be good to implement it. Everybody (I think) is aware of the limitations of IMAP and there is a major struggle to offer competitive options against Google Workspace/Microsoft 365 partly because of this.
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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.