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Re: [ietf-dkim] Clarifying DKIM (etc.) expectations for mailing lists in the face of digests

2010-08-04 12:19:15
-----Original Message-----
From: ietf-dkim-bounces(_at_)mipassoc(_dot_)org [mailto:ietf-dkim-
bounces(_at_)mipassoc(_dot_)org] On Behalf Of Dave CROCKER
Sent: Wednesday, August 04, 2010 10:08 AM
To: DKIM IETF WG
Subject: [ietf-dkim] Clarifying DKIM (etc.) expectations for mailing
lists in the face of digests

For typical, modern mailing lists, a subscriber can choose between
delivery of
each message, as posted individually, versus delivery of batches of
messages in
a digest.

In the latter case, no one would reasonably expect a DKIM signature
from a first
(author/originator) sequence to survive.  Yet there seems to be some
strong
expectation that it will or should survive if the recipient happens to
choose
delivery on a per-message basis.

In theory they could survive, if the construction of the multipart/digest from 
the MLM preserved all of the signed data from the original submission.  Then 
each contained message/rfc822 part could be DKIM-evaluated on its own.  And the 
MLM could sign the overall message.

I've never heard of that stated as a desired thing, though.


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