On Sun 06/Dec/2020 02:20:47 +0100 Douglas Foster wrote:
4) On the future of ARC: The idea is harmless, but I do not see it
achieving the list-industry goal of eliminating From rewrite. It actually
reminds me of DKIM without DMARC - a technology looking for an algorithm to
which it can contribute. Since nobody can articulate how a recipient uses
ARC information to reach an expected conclusion, something important is still
missing. As I wrote in my last post, I think it fails to provide enough
information for a useful algorithm to be defined. Even if that can be
solved, there are bigger problems. We have no algorithm for a list to know if
a particular recipient uses ARC, or whether it will use the ARC information to
draw the desired conclusion about list messages. Without those answers,
the list is doomed to continue From rewrite even if when it would not be
necessary. And much of this is about AOL in particular, and the currently
available information suggests that AOL is not on board with ARC.
I agree with the above analysis.
I'd add that ARC is most useful to large sites that develop a global reputation
system, as ARC allows to fine tune message attribution and thereby adjust the
very computation of reputation. On the opposite, small sites may have problems
trusting last hop's ARC data. They can still seal forwarded mail, though.
As far as working around From: rewriting is concerned, given the premises
quoted above, the only way is to reverse such rewriting upon final message
delivery.
Best
Ale
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