smtpd_delay_reject = no smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, reject_unauth_pipelining, reject_invalid_hostname, check_policy_service unix:private/spfpolicy smtpd_client_restrictions = check_client_access hash:/etc/postfix/helo_access, # reject_unknown_client_hostname, # reject_rbl_client dnsbl.njabl.org, reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net smtpd_helo_restrictions = permit_mynetworks, check_helo_access hash:/etc/postfix/helo_access, reject_invalid_hostname, reject_non_fqdn_hostname, reject_unknown_helo_hostname smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/helo_access, reject_unknown_sender_domain