John Levine wrote:
>> A more interesting case to consider is acm.org style forwarders,
>> where the forwarder is, in many ways, the final destination, and where
>> the address at the forwarder is "owned" by the final recipient, and
>> where they will likely ask for transactional mail of the sort that
>> senders might consider discardable be sent.
> 
> Our working hypothesis has been that most forwarders of that sort won't
> break the signature, so it's not a problem.


FWIW, this highlights the difference between an "Alias" and most other 
Mediators, a la RFC 5598.  An Alias modifies a portion of the message -- SMTP 
RCPT-TO -- that is not covered by a DKIM signature.  Hence it does not break it.

This of course does not mean that an Alias Mediator should not (also) add a 
DKIM 
signature.

d/

-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net
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