Ale said:
No, the concept of Organizational Domain is foundational to DMARC. ...
We went though this whole discussion quite a while ago when we agreed to switch to the tree walk. Unless you have a compelling argument about why our previous analysis and decision was wrong, I think we're done. Keep in mind this paragraph from 7489:
The process of determining a suffix is currently a heuristic one. No list is guaranteed to be accurate or current. R's, John PS: Mike said:
I have previously pointed out that there are organizations that lease/rent or otherwise provide subdomains as part of their commercial offerings. Your assertion is akin to claiming that tenants in an apartment building are family relatives simply because they have the same landlord. ...
This misses the point. It would be a good idea for a multi-tenant domain to publish a PSD record to keep the tenants apart, just as it would be a good idea to send a PSL pull request to keep them from spoofing browser cookies, but I don't think it is a good idea to depend on that. We know that at the TLD level, most TLDs won't ever publish a PSD.
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