Re: Received header field for special processing, such as "held for mode

Dave CROCKER wrote:
> Occasionally, the Other Crocker ventures into email space and he chose 
> to be more thoughtful about a brief thread that was just on the IETF 
> listthat noted a message delay due to being held for moderation.
> Currently, nothing in the message (or smtp responses, of course) 
> signals this reason for delay.  (For those who haven't seen the 
> thread, the person initiating the the thread thought the delay was due 
> to DKIM processing...
> It would be quite simple to add a Received header field, when a 
> message is placed into a moderation queue, noting that fact. 
What problem you're trying to address? A mechanism to report any 
arbitrary delay, or are you specifically thinking about moderator delays 
on a list?
Mail filtering products have all kinds of reasons they may choose to 
deliberately hold a message, e.g., a message that appears to contain 
restricted content might be approved for sending outside the corporate 
walled garden; a virus filter may have flagged a message as "suspicious" 
and taken it "offline" for a more time-consuming examination, like 
sand-boxing; a delay caused by a referral (4xx response).
<csg>