Teemu Likonen [2019-07-20T08:53:01+03] wrote:

> What WKD support would mean for Notmuch front-end programs?

> So, what is there left for Notmuch and email clients?

Oh, in email clients there is at least one thing to do in order to
support WKD: using gpg's "--sender" option with the sender's email
address when signing a message (if that email user ID is in sender's
key). The "--sender" option includes that email in the signature so WKD
lookup can use that. More information in gpg(1) manual page, especially
in options "--sender" and "--auto-key-retrieve".

I recently added Emacs's message-mode (and epg) that very feature. It's
in the development branch (master) since commit
emacs-26.1-6339-g74579d3d2b (2019-07-13).

http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=74579d3d2bb82f300a6f2d81b7b559f0a24061db

Variable mml-secure-openpgp-sign-with-sender has to be non-nil.

-- 
///  OpenPGP key: 4E1055DC84E9DFF613D78557719D69D324539450
//  https://keys.openpgp.org/search?q=tlikonen@iki.fi
/  https://keybase.io/tlikonen  https://github.com/tlikonen