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

"John Levine" <johnl@taugh.com> Sun, 30 March 2014 15:14 UTC

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Date: Sun, 30 Mar 2014 15:14:32 -0000
Message-ID: <20140330151432.2721.qmail@joyce.lan>
From: John Levine <johnl@taugh.com>
To: ietf@ietf.org
Subject: Re: SMTP RFC: "MUST NOT" change or delete Received header
In-Reply-To: <CAMm+LwiOJZt9aqEmZDxPFkjvHdETMKGo1tik8ege94XfXu+j4g@mail.gmail.com>
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>The justification for MUST was I suspect to prevent infinite recursion mail
>loops. For that particular purpose a count is sufficient.

Oh, of course, you're right, it even says so in section 6.2 of RFC
2821, now 6.3 in RFC 5321.  But there isn't a count, so this would be
an incompatible change to the SMTP protocol, which seems like a
non-starter to me.

R's,
John

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