[ietf-dkim] Re: signature construct

[John Levine]

>Well, this is definitely a topic for the WG but if we're contemplating 
>rejecting the message during the SMTP session itself, my MTA is already 
>doing that but, of course, it has to go through the DATA phase first.  If 
>you want to reject prior to DATA us MTA vendors should implement on an SMTP 
>extension that fetches the headers only (there is one - I think) ?

Nope.  You're probably confusing SMTP and NNTP.  With SMTP either you
accept the entire message, body and headers, or nothing.

Since you have to read through the whole body anyway, I don't see much
advantage to a two-stage hash and sign strategy.

R's,
John