On Wed 10/Aug/2022 16:52:53 +0200 John R Levine wrote:
On Wed, 10 Aug 2022, Barry Leiba wrote:
Yeh, I have to take serious issue with this:
It's not a "tantrum" to say that it's not reasonable to require all
mailing list software and every mailing list in the world to change
what's worked for decades in order to work around a problem caused by
use of a new standard in a way that new standard wasn't designed to be
used.
My understanding is that Barry means DMARC authors didn't want every mailing
list in the world to do From: munging. De-munging comes later.
Moreover, even if we totally hypothetically did persuade lists to do from
de-munging, IT WOULD NOT SOLVE THE PROBLEM.
Which problem?
Persuading mailing lists to add an Author: field can help solving the problem
of maintaining the end-to-end nature of existing identifier fields in mail.
The reason mail providers invented ARC rather than something simpler is so they
can look back and do spam filtering that the lists didn't, and deal with spam
leaking through lists. I'm not guessing here, that's what they told me. So
de-munging has all of the implementation hurdles of ARC, needing to know who's
a credible forwarder, but not the key utility.
Backward spam filtering is clearly a different problem. Even then, if ARC
verifiers want to ascribe reputation to the original author, they'd need an
Author: field. In fact, ARC was designed to replace From: munging; but, if you
look at reality, mailing lists that do ARC sealing do From: munging as well.
Setting Author: can improve handling of mailing list messages either way.
Best
Ale
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