Re: SMTP RFC: "MUST NOT" change or delete Received header

On Sun, Mar 30, 2014 at 5:38 PM, Ted Lemon 
<ted(_dot_)lemon(_at_)nominum(_dot_)com> wrote:

> On Mar 30, 2014, at 6:44 PM, John C Klensin <john-ietf(_at_)jck(_dot_)com> 
> wrote:
> > Whether one accepts it or not, "been here already" tests are not
> > about debugging.  They are about loop detection and DoS attacks.
> Are there MTAs that make use of the Received: header for loop detection?
sendmail does, and has since the '80s.

-MSK