Eine Anleitung für den vertraulichen Email-Verkehr findet man bei Netzpolitik.org:
https://netzpolitik.org/2013/anleitung-so-verschlusselt-ihr-eure-e-mails-mit-pgp/
Wer es ein wenig bequemer haben möchte, kann die Schlüsselerzeugung auch dem p≡p-Plugin (Pretty Easy Privacy) für Outlook, Thunderbird, Android und IOS überlassen. Auch ist es möglich, den eingene Schlüssel zu importieren. pEp verschlüsselt automatisch ausgehende Mail an jene Personen, welche ebenfalls pEp verwenden. Hier geht es zu deren Dokumentation.
+++ Update vom 19.06.2021 +++
Meinen Keybase-Account musste ich zurücksetzen. Daher ist mein aktueller Key dort nicht zu finden. Als Alternative zu Keybase ist der Schlüssel auch hier finden. In der nächsten Woche werde den Key ersetzen.

Der oben genannte Key sollte mit diesem hier übereinstimmen:
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