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Re: [ietf-dkim] draft-ietf-dkim-mailinglists-02 review

2010-09-05 02:44:41
On 05/Sep/10 01:33, John R. Levine wrote:
I'm questioning whether we can get away with saying that a MLM
"is /likely/ to invalidate any or all of" a message's
signatures. Reputation considerations suggest that author domains
may want MLMs to behave consistently in this respect.

They may want that, but if we're documenting what MLMs do, I don't
think they can have what they want.  The conditions under which an
MLM will break a signature are very hard to describe.

Correct.  Still, signatures can be removed, which --by symmetry-- is 
tantamount to breaking them.  Similar effects can also be achieved 
using slightly more sophisticated techniques...

[...example snipped...]

So "is likely to invalidate" is as specific as we can reasonably be.

Yes, under the assumption that we're documenting what MLMs do.  This 
brings us back to the informative vs. normative dilemma.
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