Usage of the inps.de-DNSBL with Postfix
Please open the Postfix configuration file "main.cf" and add "reject_rbl_client dnsbl.inps.de" under the directive "smtpd_recipient_restrictions":
smtpd_recipient_restrictions = check_recipient_access hash:/usr/local/etc/postfix/recipient_access, permit_mynetworks, permit_sasl_authenticated, reject_rbl_client dnsbl.inps.de, permit_auth_destination, reject_unauth_destination # SMTP-Statuscode on a rejection because of the listing in a dnsbl maps_rbl_reject_code = 451
We recommend you to block connections only temporarily because the postmaster will see, that there is a problem if his mailqueue is highly filled. This can be realized with the line "maps_rbl_reject_code = 451".