On Sat, Jan 22, 2022 at 11:02 AM Douglas Foster < dougfoster.emailstanda...@gmail.com> wrote:
> If a.b.example.com is considered aligned with c.example.com under > RFC7489, but will be considered unaligned under DMARCbis, then we have a > pretty significant incompatibility and need to move to DMARCv2. > > In the current example of comparing a.b.example.com and c.example.com to > each other: if there is a shared DMARC policy at example.com, why would > we not consider the two names in alignment? > The alignment is because of the parent domain, not because of the sibling domains. A distinctly different situation. > > In the case of organizations that lease subdomains, do both the subdomains > and the parent domain send email and publish DMARC policies? If so, then > we are back to needing a PSL. > The practice can/will vary. There isn't a need for a PSL if alignment is not allowed based on a sibling domain's published policy. There would still be potential problems with alignment based on the parent domain but nowhere near as ugly. Michael Hammer
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