smtpd_helo_required = yes
disable_vrfy_command = yes
smtpd_recipient_restrictions =
        permit_sasl_authenticated,
        permit_mynetworks,
        reject_invalid_hostname,
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_unknown_sender_domain,
        reject_unknown_reverse_client_hostname,
        reject_unknown_helo_hostname,
        reject_unknown_recipient_domain,
        check_client_access hash:/etc/postfix/access_client_whitelist,
        check_policy_service inet:127.0.0.1:12525