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

["Murray S. Kucherawy" <superuser@xxxxxxxxx>]

On Sun, Mar 30, 2014 at 5:38 PM, Ted Lemon <ted.lemon@xxxxxxxxxxx> wrote:

On Mar 30, 2014, at 6:44 PM, John C Klensin <john-ietf@xxxxxxx> 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