Murray S. Kucherawy writes:
 > On Thu, Apr 2, 2015 at 6:59 AM, Anne Bennett <[email protected]> wrote:

 > > Right, but if that tag were explicitly deemed to be excluded
 > > from the signature, it could be handled differently.  Hmm, but
 > > if this resulted in (for example) the tag not being displayed,
 > > then we would have gained nothing in the case of mailing lists.
 > >
 > 
 > Handled by whom?  If we're talking about telling MUAs "Don't render the
 > unsigned part of the content the same way as the signed content", then a
 > bunch of additional complexities begin to appear:

How about substituting s/U/T/?  Unpacking that rather obscure
expression, if you have a well-defined protocol (as opposed to, say,
the quoting convention for replies :-), the M*T*A (or spam-fighting
milter) could remove the parts signed only by 3rd parties, and add a
message/rfc822 subpart of the whole original message as an attachment
which the reader *could* look at, if they want to, in most M*U*As.
Really paranoid sites like A** and Y****! could just remove on
receipt.

 > - We're wandering into conversations about how MUAs should interact
 >   with users, which this community typically avoids like a terrible
 >   allergy

Note that although this does rely on the MUA to havec certain
capabilities, most MUAs *do* have them, and I hope that users will
accept the inconvenience because they get the original message without
the third-party decorations.

I suspect this line of thought is beneficial only to MLs,
unfortunately.

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