Email encryption is a term that refers to the encryption and authentication of electronic mail, or e-mail. The most common email encryption is designed to rely on what is called public key cryptography. There are several popular protocols that are used to encrypt e-mail, the most notable of which are mail session encryption, certificate encryption, Open PGP encryption, TLS encryption, and S/MIME encryption.
Mail Session Encryption - this is associated with increased use of STARTTLS SMTP, which is a layer of TLS, which is on top of the connection SMTP. She is able to protect mail traffic sniffed as he passed, but it really does not include email encryption, as the actual content within the e-mail capable of being opened and thusly forged e-mail relays, which are involved. Cryptography, then, is really going on between the individual SMTP relay, but not between the individual sender and recipient. When both relays support the proposal STARTTLS, then it can be used regardless of whether or not another protocol used to encrypt the contents of the e-mail.












