ietf-dkim
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Re: [ietf-dkim] Acronyms

2009-03-11 13:18:40


Barry Leiba wrote:
The only concern I have here is that because "user agent" has a
specific connotation, there could be confusion about what happens to
it when a user uses more than one UA.  Suppose I use Gmail's web
client, Mulberry, Apple Mail, and Thunderbird, all at different times,
and all sending mail as <barryleiba(_at_)computer(_dot_)org> through Gmail's
email infrastructure.  (In fact, that *is* the case.)  Should the UAID
that Gmail sticks in the signature always be the same, because it's
just me, using these client programs interchangably? 


I think this mostly confuses implementation with architecture.

Simple test:  Are you using/getting different email addresses when you use 
these 
different modes of access?  Probably not.

That said, note that John Levine's description of his signing model nicely 
provides an example of having different UAID values, depending on the author's 
means of access.  In this case, he's decided that there is in fact some real 
utility in making exactly the distinction you raise.  So it's plausible, but no 
it's not necessary.



-- 

   Dave Crocker
   Brandenburg InternetWorking
   bbiw.net
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