How to reject email with not have reverse dns?

my postfix conf. is:
Code:
smtpd_sasl_auth_enable  = yes
broken_sasl_auth_clients = yes
smtpd_sasl_type         = dovecot
smtpd_sasl_path         = private/auth
mailbox_transport       = dovecot
disable_vrfy_command    = yes
smtpd_delay_reject      = yes
smtpd_helo_required     = yes
smtpd_sender_restrictions =
                        permit_sasl_authenticated,
                        permit_mynetworks,
                        reject_non_fqdn_sender,
                        reject_unknown_sender_domain,
                        permit

smtpd_recipient_restrictions =
        permit_sasl_authenticated,
        permit_mynetworks,
        reject_non_fqdn_recipient,
        reject_unknown_recipient_domain,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_unknown_reverse_client_hostname