Keith,
The DKIM component that establishes reputation is being discussed
within the DKIM WG. The DKIM signature offers an alternative to the
IP address which serves as perhaps the only other assured basis for
reputation. Of course the IP address also shares all of these
problems. A DKIM signature can help avoid some of the reputation
problems associated with shared use of an IP address (which is a
larger problem for smaller domains). For larger domains, there might
be some concern related to replay abuse, where again, smaller domains
also enjoy an advantage in being able to squelch compromised systems.
Don't be too quick to condemn DKIM. There should be a simple
mechanism which allows email-domains to autonomously authorize
DKIM-domains.
that feature should have been there from day one.
Keith
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