Pretty Good Privacy (PGP)
Pretty Good Privacy or PGP is a type of email encryption that uses a combination of two encryption frameworks – symmetric key encryption and public key encryption – to encrypt email information during communication. PGP is often used to encrypt sensitive files and emails with a wide range of security features to ensure the confidentiality of messages.
Secure Multipurpose Internet Mail Extension (S/MIME)
S/MIME is another type of email encryption that can be used to encrypt email content and digitally sign for authentication. The S/MIME protocol was created by RSA Data Security and requires the issuance of digital certificates from a trusted Certificate Authority.
Transport Layer Security (TLS)
Transport Layer Security or TLS is an email encryption protocol that allows users to cryptographically encrypt email content during transmission so that the message is transmitted over a secure connection between two communicating servers. Email authentication protocols, such as MTA-STS, help apply TLS encryption to ensure that your email traffic is protected from cyber interception.