Dave Crocker wrote:
J>> At the end, I can't identify the reason why a mailing should add a
signature to a message, may be because I didn't understand how third
party signature can be used with a signer (i=) different from the
message Sender. Also I can't see how MUA could deal with message with
multiple From: . It is definitively not a common usage and it will not
be accepted by users because it suppose some modification in MUA.
We should stay away from multiple From: addresses; MUA behavior is
inconsistent (we have done a few experiments).
Jim,
What do you mean "stay away from"? Multiple From addresses are legal
and gets used occasionally, with existing MUAs.
Unless DKIM is going to attempt to change RFC2822 rules, we cannot
have DKIM fail to handle a legal header case.
Agreed; what I said wasn't very clear. What I meant was that we should
avoid additional usage of multiple From fields as part of DKIM. For
example, one way of making the signer address visible might be to put it
in the From field as an additional author, e.g.:
From: "Jim Fenton" <fenton(_at_)cisco(_dot_)com>, "Signed by ietf-dkim"
<ietf-dkim-bounces(_at_)mipassoc(_dot_)org>
I'm not sure anyone is proposing that, but it could otherwise be seen as
logical since some of the content came from me, and some (the message
trailer, for example) came from the list manager.
-Jim
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