At 2:05 PM -0800 3/15/06, Michael Thomas wrote:
And then what? What would you have my receiver do differently just
because some random third party inserted a signature?
There is no "random third party" here. It is a mailer that the user
gets mail from. The signature would match the content of the message
that they got, including list-specific content such as List-*
headers, the possibly-munged Subject line, and the possibly-munged
body.
What they would do differently is validate the signature, see that it
is from someone who is supposed to be signing the message, and accept
it, just like they do for regular mail.
In any case, we're only talking about
one valid signature since the mailing list torqued the original signature.
If there is WG agreement that there can only be one DKIM signature
per message, then the mailing list removes the existing signature and
replaces it with its own. If there is WG agreement that there can be
parallel or cascading signatures, then the mailing list adds its
signature.
The fact that the WG has not yet decided how to handle multiple
signatures does not mean that it won't in the future.
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