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smtpd_helo_restrictions =
        permit_mynetworks,
        warn_if_reject,
        reject_invalid_helo_hostname,
        reject_non_fqdn_helo_hostname,
        reject_rhsbl_helo dbl.spamhaus.org,
        permit
smtpd_sender_restrictions =
        warn_if_reject,
        reject_non_fqdn_sender,
        check_sender_access hash:/etc/postfix/sender_access,
        reject_rhsbl_sender dbl.spamhaus.org,
        permit
smtpd_relay_restrictions =
        warn_if_reject,
        reject_unauth_destination,
        permit_mynetworks
smtpd_client_restrictions =
        warn_if_reject,
        reject_rbl_client bl.spamcop.net,
        permit
smtpd_recipient_restrictions =
        permit_mynetworks,
        warn_if_reject,
        reject_unknown_recipient_domain,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_invalid_hostname,
        reject_non_fqdn_hostname,
        reject_non_fqdn_recipient,
        check_sender_access pcre:/etc/postfix/sender_access.pcre,
        reject_rbl_client dnsbl.sorbs.net,
        reject_rbl_client zen.spamhaus.org,
        reject_rhsbl_reverse_client dbl.spamhaus.org,
        permit
smtpd_data_restrictions = reject_unauth_pipelining
#smtpd_end_of_data_restrictions = check_policy_service unix:private/policy
strict_rfc821_envelopes = yes
disable_vrfy_command = yes
unknown_address_reject_code = 554
unknown_hostname_reject_code = 554
unknown_client_reject_code = 554