Include KMail from KDE

[snassar]

KDE's KMail has deep OpenPGP support built in and conversations about modernPGP should include it.

https://www.kde.org/applications/internet/kmail/

[anarcat]

but do they "have agreed (to some degree) to be a part of this working group and work towards improving the usability across the PGP eco-system"? it's the one criteria to be part of the list.