On Mon, 4 Apr 2022, Alessandro Vesely wrote:
The last sentence is particular in that Section 4.8 aims at determining the Organizational Domain for /any/ identifier, not just the From: domain. We are assuming that an org domain can be determined for any domain, always.

At the end of Section 4.8, in order to fulfill that assumption, in the absence of DMARC records, "the initial target domain" is promoted to the rank of Organizational Domain of itself. That way, a PSD /is/ an org domain, which formally counters the second sentence in 3.2.7.

If it's the original domain, yes. If it's an ancestor found in the tree walk, no.

To make the change clearer, I suggest to use different terms ...

No.  We can clarify the text but we already have too much jargon here.

R's,
John

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