On Jul 31, 2009, at 9:17 PM, Franck Martin wrote:
I was curious by Scott comment re SPF.
Is there a class of spam that cannot get a DKIM signature?
I would think botnets would be that class, as they usually infect
computers and not sure they could DKIM sign as it would require them
to set a DNS entry too. Knowing that botnets are 70% of spam, if
DKIM could solve this one it would be great.
This is trivial for botnets to do. Apart from the obvious ways, many
botnets already run DNS.
so my question to add to your question "Does the presence of a
signature provide any objective data about the goodness or badness
of the signer?" is:
is there a class of spam that cannot get a DKIM signature?
It says that the software generating the email was written at some
point after 2007. Which is a data point, but not a terribly useful one.
Cheers,
Steve
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