Re: RFC2821bis-01 Issue 4: Client actions on receipt of 4yz and 5yz code

Tony Hansen wrote:
> As yet, there has been no discussion on this issue.
> John C Klensin wrote:
[...]

> > Question: Should the 5yz description  be changed to use "SHOULD NOT".  
> > If not, is "SHOULD" in the 4yz description reasonable?
I would go as far as to say MUST NOT for a 5yz response code, (allowing
as 2821 does now for human intervention to correct typos, etc.)

Regards,

David.