[ietf-dkim] DKIM and mailing lists
fenton at cisco.com
Sat Jan 21 10:29:41 PST 2006
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).
> 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.com>, "Signed by ietf-dkim"
<ietf-dkim-bounces at mipassoc.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.
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