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

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 01 April 2014 19:53 UTC

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Date: Tue, 01 Apr 2014 12:53:12 -0700
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Subject: Re: SMTP RFC: "MUST NOT" change or delete Received header
From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Ted Lemon <ted.lemon@nominum.com>
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Cc: John C Klensin <john-ietf@jck.com>, IETF Discussion Mailing List <ietf@ietf.org>
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On Sun, Mar 30, 2014 at 5:38 PM, Ted Lemon <ted.lemon@nominum.com> wrote:

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

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