@girish said in JMAP:

on dovecot side, JMAP support is not really being actively worked on - http://dovecot.2317879.n4.nabble.com/JMAP-support-td73445.html

Yeah, kind of being ignored a little bit. lol
AFAICS, JMAP does not seem to bring such great enhancements such as to shake the email servers industry, yet. That is very likely why there's seems to be not so much enthusiasm about this protocol. IMHO