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  Received: from portent.example.com (portent.example.com [208.58.1.195])
        by bar.example.org (envelope-from
        <owner-foo-discuss@example.com>)
        (Postfix) with ESMTP id 12CE931024F for <foo@example.org>;
        Wed, 28 Jan 2004 08:54:19 +0000 (GMT)

(replaced @ with (AT) to avoid spambots)

This would allow filters like SpamAssassin to pick up the envelope-from used at each step of the chain, which is very valuable especially when intermediate steps tend to rewrite it. (For example, fetchmail makes some incorrect assumptions, and will add an *incorrect* Return-Path header if an X-Envelope-From header exists, even from an earlier handover.)

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