Re: Last Call: SMTP Service Extension for Content Negotiation to Propose

On Mon, 08 Jul 2002 10:20:21 PDT, ned(_dot_)freed(_at_)mrochek(_dot_)com said:

> On the contrary, far from being incompatible, this facility may actually
> facilitate the ability to use signatures in situations where it presently 
> isn't
> possible to use them. Specifically, if a client is aware of a recipient's 
> needs
> it can tailor a message for that recipient and then sign it after the 
> tailoring is complete. Without this knowledge what tends to happen is that the
> tailoring is done after the signature is applied, which of course renders the
> signature invalid.
Unfortunately, the draft as written doesn't provide a mechanism to push that
information back as far as the sending MUA - you could only get this to work
if the MUA included its own sender-side MTA functionality (which would be at
odds with the push to use port 587 and the practice of many ISP's of blocking
outbound to port 25 except from their mail servers).
-- 
                                Valdis Kletnieks
                                Computer Systems Senior Engineer
                                Virginia Tech

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