The combined DKIM standard, mixing Yahoo!’s DomainKeys and Cisco’s IIM, has been submitted to the IETF as a candidate spec by the MASS ‘pre-working group effort’. I like the idea behind both (a few years back, I, a few other SpamAssassin developers, and several others came up with the roots of a message-signature anti-forgery scheme we called ‘porkhash’, but never really went anywhere with it), so I’m glad to see this one progressing nicely.