Cyrus IMAPd master is pretty much up to date. JMAP-Proxy is sitting slightly behind, that's on me. Less up-to-date, there's a few, atmail, Apache James (via L

Cyrus IMAPd master is pretty much up to date. JMAP-Proxy is sitting slightly behind, that's on me. Less up-to-date, there's a few, atmail, Apache James (via Linagora), a couple that aren't published.