• Transport Layer Security (TLS): This is an Internet standard extension to SMTP and is universally supported in mail transfer agencies. It can be used as an authentication method as well as an encryption method.
• S/MIME Gateway Encryption: This allows two organizations to establish encrypted links with each other by exchanging organizational keys (certificates) and having the email servers automatically encrypt and decrypt messages.
• End-to-end Encryption: The most secure means of encryption and can provide non-reputatiblty.
• No-Client-Side-Software-Required: This means that the sender doesn’t have to have a public key in order to encrypt email to a recipient.
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