Suresh Ramasubramanian wrote:
>> If you want a signature that identifies the individual user, there's
>> S/MIME and PGP.
> 
> Instead of i=?  In situations described where "author of the message"
> = "user" = "grandma"?


An ISP signs "on behalf of" the owner of a mailing list.  While many different 
d=/i= values could satisfy this, let's say that this particular operator 
chooses 
something like:

    d=  paying-users.this-isp.example

    i=  [email protected].

The From: field, of course, is something like:

    From:  [email protected].

So, how is a receiving assessment module supposed to know whether your scheme 
is 
in force or the one I've described here, or the one John uses, or the one...?

d/

-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net
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