On 7/21/2020 12:32 PM, Dotzero wrote:
The original DMARC effort was, in fact, to detect actual cases of
spoofing, namely unauthorized use of a domain name by outside actors.
Different problem.
Actually, part of the effort was to enable Sending domains to identify
their own mail that was being sent without aligned DKIM signing or
from places not authorized through SPF - in other words, not properly
authorized but legitimate, hence feedback loops.
As I recall, this was /not/ part of the original purpose of DMARC, which
was discussed strictly in terms of mail from bulk senders.
What you describe was, rather, the basis for the later use, which is
what then started causing problems for mail going through Mediators.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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