After quite some time, I just tried to send a PGP encrypted email via KMmail. I can't tell for how long this has been around, but doing this causes a crash. After selecting "encrypt" and sending the email, the UI freezes, and on on the console is full with: ... org.kde.pim.kmail: Danger, using an event loop, this should no longer be happening! org.kde.pim.kmail: Danger, using an event loop, this should no longer be happening! org.kde.pim.kmail: Danger, using an event loop, this should no longer be happening! org.kde.pim.kmail: Danger, using an event loop, this should no longer be happening! And finally: Das Signal SIGALRM empfangen (Der Wecker klingelt) (received signal SIGALRM). Sending PGP-signed emails works, as well as sending encrypted email that are additinally signed. Only sending encrypted-only emails is affected here. Tested by sending an email to the used identity's address as well as to other ones. KDE Plasma Version: 5.19.5 KDE Frameworks Version: 20.08.3 Qt Version: 5.15.1