Re: [dmarc-ietf] Author vs Signer Domains

If you meant "external ESPs are applying DMARC per spec according to RFC7489 6.6.2 step #5" that would be more accurate. The prescribed method is, "If *one or more of the Authenticated Identifiers* align with the RFC5322.From domain, the message is considered to pass the DMARC mechanism check."

Re: [dmarc-ietf] Author vs Signer Domains

> On Apr 14, 2023, at 6:42 PM, Hector Santos > wrote: > > On 4/14/2023 7:31 PM, Dotzero wrote: >> On Fri, Apr 14, 2023 at 5:55 PM Hector Santos >> mailto:40isdg@dmarc.ietf.org>> wrote: >> >>Yes, it is simple DeMorgan’s Theorem where you use >>short-circuiting logic. >> >>

[dmarc-ietf] Author vs Signer Domains

On 4/14/2023 7:31 PM, Dotzero wrote: On Fri, Apr 14, 2023 at 5:55 PM Hector Santos > wrote: Yes, it is simple DeMorgan’s Theorem where you use short-circuiting logic. DMARC says that any FAIL calculated via SPF or DKIM is an overall DMARC