>>> People who contribute to mailing lists shouldn't say dkim=all.  We
>>> argued this ad nauseam when we were hammering out ADSP, it shouldn't
>>> come as a surprise to anyone.
>> That is not true at all. They shouldn't be using discardable. "All" only
>> says what the sender does, not what the receiver should expect.
> 
> They certainly shouldn't be using discardable.  I would advise not using
> all either, due to the observed tendency of people to pay way too much
> attention to DKIM and ADSP failures.


Folks,

To claim that one signs all mail is to imply that anyone receiving mail from 
them should see a valid signature.

Mail sent through list servers invites the problem of receivers getting mail 
that does not have the promised valid signature, since intermediaries are 
re-posting the message and are free to make whatever changes they see fit.

Hence, saying -all for mail that goes through intermediaries which might affect 
the signature is inviting receivers to treat the received mail with hostile 
prejudice.

d/
-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net
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