New Postfix Config

Here is my latest addition to my main.cf

smtpd_sender_restrictions = hash:/etc/postfix/deny

disable_vrfy_command = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions =
     permit_mynetworks,
     reject_non_fqdn_hostname,
     reject_invalid_hostname,
     permit

smtpd_recipient_restrictions =
        permit_mynetworks,
        reject_unknown_sender_domain,
        reject_invalid_hostname,
        reject_non_fqdn_hostname,
        reject_unauth_destination,
        reject_rbl_client b.barracudacentral.org,
        reject_rbl_client zen.spamhaus.org,
        reject_rbl_client spam.spamrats.com,
        reject_rbl_client bl.spamcop.net,
        permit