On Monday, August 09, 2010 06:48:51 pm John Levine wrote:
This assumes mail from MLMs is treated differently than other mail.
While individual users may (and probably do) treat it differently,
receivers of non- trivial scale don't and can't.
Sigh. Anyone who uses gmail would know that your assertion is just
plain wrong.
There's a difference between "claims to be from an MLM" and "From an MLM".
Today there isn't much value in making the claim, so no one bothers. It would
be unfortunate if we recommended something that caused List-ID headers to be
less useful because people found value in spoofing them.
And in any event, even if your assertion were true, so what? Our
working assumption is that receivers will use valid DKIM signatures to
whitelist mail from signers they like. How does it matter whether the
signer happened to be a related to a list?
If I'm a consumer of your list of domains that you're convinced sign all their
mail and I get an unsigned message from one of them, I'm bound to be extra
suspicious of that. "Oooh, it came from a mailing list so I don't care" isn't
the most likely response.
Which is why the whole straw poll is irrelevant. Since the D in DKIM is
Domain, it's really no concern how individuals filter mail.
Scott K
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