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

"John Levine" <johnl@taugh.com> Mon, 31 March 2014 01:16 UTC

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Date: Mon, 31 Mar 2014 01:16:24 -0000
Message-ID: <20140331011624.4728.qmail@joyce.lan>
From: John Levine <johnl@taugh.com>
To: ietf@ietf.org
Subject: Re: SMTP RFC: "MUST NOT" change or delete Received header
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>>Are there MTAs that make use of the Received: header for loop detection?
>
>Mine has since 1998.  If the SMTP daemon sees 100 Received: headers in
>an incoming message, it rejects it.  This is both in qmail's SMTP
>daemon and mailfront, a better SMTP daemon often used with qmail.

A little more poking around finds that sendmail and postfix also do,
although their default limits are 25 and 50 headers, respectively,
rather than 100.

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