I just wish there would be more pure JMAP email clients. But maybe soon!
Pretty much all of that I had never heard of and many of them looked decent so I figured I would share.
It already has stalwart 1.0.0 support ...
From their website: "Webmail for Stalwart Mail Server.
Bulwark puts mail, calendar, contacts and files in one browser client that talks JMAP to your own server."