Re: Return codes, was Updated draft for "SMTP Response for Detected Spam"

In case it wasn't clear I am *not* proposing that they advance it as an 
RFC at this point.  You don't need an RFC to do an experiment.  You just 
do it.

A registry is useful to keep experiments from accidentally stepping on 
each other.

With respect to clients, it would take about 10 milliseconds for a bunch 
of ESPs (bulk senders) to sign up for this.  That's not a problem.

R's,
John

On Thu, 31 Mar 2022, Dave Crocker wrote:

> On 3/31/2022 10:08 AM, John Levine wrote:
>> With respect to 259 vs 559, Comcast is a pretty big mail system. If
>> they think this could be useful, which they apparently do, I think it
>> would be a fine idea to try the experiment
>
>
> In its current form, it is far too tentative about utility.
>
> 1.  It needs to be specific and specify meaningful action
> 2.  It really should have a demonstrated base of interest, to give some 
> indication that returning the code(s) will be useful to at least some client SMTPs.