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DMARCbis is around the corner: what's changing
The updated DMARC specification is almost ready. Learn how the DMARC record and the algorithms are going to change.
In the context of determining the Organizational Domain, both for DMARC record discovery and identifier alignment, the Public Suffix List mechanism has been replaced with the more flexible (and complex) DNS Tree Walk algorithm. It should be noted that not all authoritative name servers correctly return the NXDOMAIN status code when a subdomain doesn’t exist (i.e. it has no DNS records at all), so it remains to be seen what impact this will have in practice. This mechanism was deemed unreliable (public suffix lists are community projects and updated on a volunteer basis) and has the limitations mentioned in the previous section.
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