Would be good to do what Gmail does over IMAP because many email clients already know how to handle it. A feature that only works in the web UI isn't useful fo

Would be good to do what Gmail does over IMAP because many email clients already know how to handle it. A feature that only works in the web UI isn't useful for me and while I'm excited about JMAP, it doesn't have support in any of the email clients I can use.