How to configure your MTA to accept the Spamhaus Project’s error codes

Introduction

The Spamhaus Project is slowly introducing error codes for users of their Public Mirrors. This indicates that IP or domain reputation data isn’t returned when queried. Where an MTA isn’t correctly configured to parse the error codes, email administrators can face significant problems with their email streams. These configuration guides for common MTAs help those managing email infrastructure correctly set up their MTAs to avoid issues when parsing an error code. Find them here.