On 6/18/2020 2:10 PM, Jim Fenton wrote:
On 6/17/20 12:11 PM, Pete Resnick wrote:
On 17 Jun 2020, at 13:27, Dave Crocker wrote:
DMARC has nothing to do with display of author information to a
recipient, and everything to do with differential handling by a
receiving filtering engine. Were the Sender: field always present,
that would be the one that DMARC should have used.
It could have chosen the more complicated, "Sender unless not present,
in which case From". But yes, this bit I get. That said, there are
people who have argued that From: was chosen because Sender: was not
displayed. I think that's a silly argument, but it's one that people
still believe.
I'm trying to understand why alignment to any header field is important
to DMARC in that case.
Because operators have found useful correlations in distinguishing
between messages that are aligned and being 'genuine' versus ones that
are not aligned.
In the abstraction of theory, you are correct that it shouldn't matter.
In the brutality of practice, it appears that it does.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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