Mark Martinec wrote:
> "relaxed" might work in that particular example, although sendmail
> is still notorious for mangling header fields such as a To:, which is
> why I generally recommend not signing the To:.

For a normal authentication mechanism, the idea of leaving something as 
important as a recipient address field "unprotected" would seem heresy.

But, then, DKIM isn't for normal authentication.  All it is really trying to 
protect is the association between the signing domain name and the message. The 
only parts of the message that need to be hashed are the ones that are 
essential 
for that purpose.

The choice of what is essential might vary, but for most situations, it will 
probably be a much smaller portion of the message than one would expect.

d/
-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net

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