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/main.cf, adding the following two lines.
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