Muhammad Yousuf Khan:
> smtpd_recipient_restrictions = permit_mynetworks,
> permit_sasl_authenticated, reject_unauth_desti$

As documented permit_mynetworks accepts mail from clients that match
the "mynetworks" parameter value.
See: 
http://www.postfix.org/postconf.5.html#permit_mynetworks

As documented by listing permit_mynetworks before permit_sasl_authenticated
you do not require authentication from clients in "mynetworks".
See: 
http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions
http://www.postfix.org/SMTPD_ACCESS_README.html#lists

        Wietse

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