Simple Authentication and Security Layer (SASL)

RFC 4422, RFC 4752, RFC 2222, & RFC 2444

Installing Cyrus-sasl
yum install cyrus-sasl cyrus-sasl-lib cyrus-sasl-plain cyrus-sasl-md5

Cyrus-sasl References

 * http://postfix.state-of-mind.de/patrick.koetter/smtpauth