On 7/28/2020 1:13 PM, Todd Herr wrote:
On Tue, Jul 28, 2020 at 1:37 PM John Levine <jo...@taugh.com
<mailto:jo...@taugh.com>> wrote:
The canonical example of different From and Sender is exactly this:
Sender is an assistant working for and sending mail for From.
This is also precisely the situation I asked about during the session
on Dave's sender proposal.
And it is exactly the reason RFC 733 defined two different header fields.
Using the Sender header and the "snd" bits in the DMARC policy for
firstbrand.com <http://firstbrand.com>, DMARC would pass for the
Sender domain and fail for the From domain.
Which verdict gets applied to the message?
DMARC is written with the view that receivers will follow the directive
in the domain owner's DMARC record, but really the receiver has complete
discretion, and many receivers exercise that interpretive freedom.
So the answer to your question needs to be: the receiver needs to juggle
these bits of information and decide what action to take. It's what they
do, anyhow.
This isn't something that has a simple, obvious answer that is always
correct. So leave it as a matter of receiver discretion. Especially
since that's what it actually is.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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