On 11/25/20 12:31 PM, John Levine wrote:
In article <b0f72407-81ce-9990-4a5b-7b0e5b76e...@mtcc.com>,
Michael Thomas <m...@mtcc.com> wrote:
When I was at Cisco, with l= and some subject line heuristics I could
get probably like 90+% verification rate across the entire company, a
company that uses external mailing lists a lot. Definitely not 100% though.
I think you will find that at very large mail systems like gmail and
Microsoft and Yahoo, 90% might as well be 0%. The volume of errors is
just too high and the number of complaints would be impossible.
While I almost never see the sort of spam leakage through mailing lists
that Brandon reports, I believe him when he says it's enough of a problem
that Gmail can't just whitelist traffic from mailing lists.
Not everything is service provider. We were investigating this from an
enterprise standpoint.
And if you can't trust mailing traffic from providers what is the point
of ARC?
Mike
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