Hatter Jiang, WebEncrypt.Org, My key: https://hatter.in/keyhttps://hatter.in/key
You can also use third-party encryption tools with Microsoft 365, for example, PGP (Pretty Good Privacy). Microsoft 365 does not support PGP/MIME and you can only use PGP/Inline to send and receive PGP-encrypted emails.
Jun 16, 2020 The GNU Privacy Guard GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).GnuPG allows you to encrypt and sign your data and communications; it features a versatile key management system, along with access modules for all kinds of public key directories. Introduction to PGP encryption and decryption
How to use PGP encryption on Windows for free using Gpg4win
Nov 30, 2018 Pretty Good Privacy - Wikipedia