The DNS Tree Walk in DMARCbis, and what it means for your subdomains
DMARCbis swaps the Public Suffix List for a DNS Tree Walk to find your policy, capped at eight queries. What that changes, and why your subdomains need their own records.
Read postDMARCbis swaps the Public Suffix List for a DNS Tree Walk to find your policy, capped at eight queries. What that changes, and why your subdomains need their own records.
Read postDMARCbis published in May 2026 as RFC 9989, 9990 and 9991, replacing RFC 7489. What actually changes for your records, and why there is nothing to panic about.
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