How is the Simple Authentication and Security Layer (SASL) authentication enabled in Postfix SMTP server in Red Hat Enterprise Linux 5?

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Cyrus Simple Authentication and Security Layer (SASL) library authenticates a remote SMTP client's username and password; while the email accounts are part of the local system accounts. To enable (SASL) authentication in Postfix SMTP server follow these steps:

Step 1: Verify that cyrus-sasl has been installed.

Step 2: Modify /etc/postfix/, adding the following two lines.

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