Stephen,
So, in an attempt to move towards that, let me
try to ask for opinions on this discrete part of
the issue: When an n-th signature(*) is added by
some signer, does that mean:
a) I take independent responsibility for having
sent/fowarded (the bits of) this email (that I've
signed), or,
b) Me too, whatever that previous good signer
meant - it's not gotten worse.
The meaning of a DKIM signature has been kept intentionally minimal and vague.
Something like alternative (b) moves towards complex relationships among
signers, whereas (a) retains basic simplicity.
So, I hope (a) is the choice.
To the extent that a signer includes the DKIM-signature header of a previous
signature, that ought to mean nothing more than ordering, not semantics.
d/
--
Dave Crocker
Brandenburg InternetWorking
<http://bbiw.net>
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