Spamhaus warns: Watch for new (error) response codes

Anti-spam blocking list group Spamhaus is warning that come March 2021, they will begin implementation of new error codes (DNSBL lookup responses) that they may provide in response to certain queries run against the Spamhaus blocking lists.

Those new codes are meant to alert you if you typo the DNSBL name, if you're querying Spamhaus via a public or open DNS resolver, or if you are making an excessive number of queries (lookups) to the Spmahaus blacklists.

These could have the effect of catching people unawares and causing all mail to be blocked. Be sure to head on over to the Spamhaus website and learn more about what this all means.

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