Just on one portion, here:

On Thu, May 28, 2009 at 3:30 PM, Doug Otis <[email protected]> wrote:
> Some systems handle message attachments separately, and at times may exclude
> attachments.  Eventually, a practice similar to DKIM should be established
> to separately encapsulate attachments.  Once such a convention exists,
> separating message attachment hashes will better ensure textual portions of
> a message can be handled independently from that of message attachments.

Hm.
I should think that the DKIM way to handle the removal of attachments
would be for the agent that remove the attachments to re-sign the
message after it does so.

Barry

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