It appears that Alessandro Vesely  <[email protected]> said:
>     In general, it is not possible to determine DNS zone cuts by querying
>     various subdomains.  However, DMARC users define DMARC records at their
>     Organizational Domain, so it is possible to discover them based on that.

Sorry, but this is just wrong.  DMARC and the tree walk have nothing, and I 
emphasize
nothing, to do with zone cuts.

R's,
John

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