This has been submitted as an internet draft.
DKIM Third-Party Authorization for Sender Signer Practices
http://www.sonic.net/~dougotis/dkim/draft-otis-dkim-tpa-ssp-00.html
http://www.sonic.net/~dougotis/dkim/draft-otis-dkim-tpa-ssp-00.txt
-Doug
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