Re: Feedback on Hypertext Mail Protocol (a.k.a. Stub Email)

James,

I think I understand just about your entire argument, except for this:

>   - Participating intermediate MTAs don't save bandwidth over the
>     current system, when it comes to such a message.  In fact, their
>     per-message burden increases, because they not only have to deal
>     with the full message contents as with vanilla SMTP, they have to
>     deal with a stub version of a message *and* at least one DNS
>     lookup to obtain the full contents -- a lookup based on arbitrary,
>     attacker-provided data (which has problems I've posted about
>     before).

It seems to me that HTMP even *with* obfuscation will still, on 
average, decrease the per-message bandwith burden for intermediate 
MTAs, when taking both upstream and downstream bandwith into account. 
Or is there some reason of which I am unaware that it is proper to 
exclude upstream bandwith from your calculation?

Thanks,

Nathan