Back in late 2019, we advised of some new return codes for users of our public mirrors. We appreciate world events may have distracted you from this technical update. However, we will soon be implementing these codes and want to ensure these changes don’t cause you any serious operational issues….

*** This is a Security Bloggers Network syndicated blog from The Spamhaus Project authored by The Spamhaus Team. Read the original post at: https://www.spamhaus.org/resource-hub/dnsbl/using-our-public-mirrors-check-your-return-codes-now