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=== Encryption ===SASL is able to provide a mechanism to authenticate remote users by username and password trying to relay mail. The mechanism has users sending their authentication information as plain unencrypted text. Because packets can be intercepted, and the username password combinations easily read, there is a need to encrypt the connection. Encryption options include SSL (Secure Sockets Layer) or TLS (Transport Layer Security) - note that SSL was renamed TLS by the IETF as of version 3.1.