Roland Turner via dmarc-discuss:
Yes. In all of the cases above, the Organizational Domain for both
RFC5322.From and the DKIM/SPF authentication is example.com,
consequently they match in relaxed mode. The same would be true for:
- RFC5322.From: a.example.com
- DKIM or SPF authentication identifier: b.example.com
Consideration 10.4 is exactly about what happens when independent
and/or potentially hostile parties have control of sub-domains.
Thanks. That was new to me.
Why was DMARC defined in that way?
Andreas
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