On Monday, December 20, 2021 12:39:15 PM EST Alessandro Vesely wrote:
> On Sun 19/Dec/2021 21:42:16 +0100 Scott Kitterman wrote:
> > If the domain owner has suggested that you reject mail from a sub-domain
> > that has none of A, AAAA, or MX records, why would you not do that?
> Are we sure that's what the domain owner meant to suggest?
> 
> An organization can use sp= on its root domain record, or it can define a
> DMARC record at some subdomains.  So far so good.
> 
> Then it turns out that one can also define DMARC record at some non-existing
> sub domains, possibly as an alternative to using np=...  Now this begins to
> look puzzling.
> 
> The reason to introduce np= was to select domains that really don't exist. 
> Why don't we stick to that definition?

What definition are you wondering why we didn't stick to?

Scott K


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