If I understood correctly, this is how it should be set up:
########################################
smtpd_helo_required = yes
smtpd_helo_restrictions =
reject_invalid_hostname,
reject_unknown_client,
reject_unknown_hostname,
reject_non_fqdn_hostname,
permit_mynetworks
smtpd_client_restrictions =
hash:/etc/postfix/client_restrictions,
reject_unknown_client,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client zen.spamhaus.org
disable_vrfy_command = yes
smtpd_recipient_restrictions =
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_unauth_destination,
check_recipient_access pcre:/etc/postfix/recipient_checks.pcre,
check_helo_access hash:/etc/postfix/helo_checks,
check_sender_access hash:/etc/postfix/sender_checks,
check_client_access hash:/etc/postfix/client_checks,
check_client_access pcre:/etc/postfix/client_checks.pcre,
permit
smtpd_data_restrictions =
reject_unauth_pipelining,
permit
########################################
Is that OK ?
