Encrypted email is still not popular, because this is so embarrassing:
Tag: PGP
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EMail Protocols
Privacy Enhanced Mail (PEM): Uses Data Encryption Standard (DES) in the Cipher Block Chaining (CBC) Mode.
Secure Multipurpose Internet Mail Extension (S/MIME): Uses the user’s encryption algorithm with RC2, DES, and 3DES for confidentiality.
Pretty Good Privacy (PGP): Uses the International Data Encryption Algorithm (IDEA) for encryption of bulk data.