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smtpd_recipient_restrictions = permit_mynetworks,
        reject_unknown_sender_domain,
        reject_unknown_recipient_domain,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        check_recipient_access hash:/etc/postfix/recipient_access,
        check_sender_access hash:/etc/postfix/restricted_senders,
        reject_unauth_destination,
        reject_rbl_client dnsbl.sorbs.net,
        reject_rbl_client zen.spamhaus.org,
        permit