Encrypted e-mails to anyone

[LongTom]

Since most people we have to send e-mails to haven't set up PGP, can you please implement a way to nevertheless send encrypted, password-protected messages to them, too? And if possible, give them an opportunity to reply within the same, safely encrypted communication channel?

[Jon]

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[天王寺屋]

As a realistic means,
The "Tutanota" or "ProtonMail" method?
https://en.wikipedia.org/wiki/Tutanota
https://en.wikipedia.org/wiki/ProtonMail