[ietf-dkim] DKIM on envelope level

[SM]

Hi Dave,
At 06:45 29-10-2009, Dave CROCKER wrote:
>I was just at a session at an industry trade association where the 
>question of
>doing DKIM during SMTP came up.  There were operations folk who very 
>much liked
>the idea of being able to obtain some DKIM benefit during the SMTP session,
>before the dot...

Murray and I discussed the idea of doing DKIM during SMTP last 
year.  There were some flaws in the idea such as how to deal with 
replay.  There is also the drawback of getting this deployed as it 
requires changes to the MTA.

>What /was/ discussed was the possibility of doing a signature that would
>validate before DATA.  This merely requires a signature that does 
>not cover the
>body.

I guess that you are looking at it implementation-wise where we can 
skip the body() call.  This is like having a "l=0".

Regards,
-sm

P.S. Apologies to the WG Chairs for going off-topic.