In article <C600B92F26F58A4D653F125D@PSB> you write:
First of all, I think what Pete and I are both saying is that it
is important that the specification be clear about ordering.
That could be Return-path: on top, "Delivered-to:" on top, ...
I took a look at what qmail and postfix actually do. I believe they
add most if not all of the Delivered-To headers found in the wild.
* If they add both headers at the same time, the Return-Path is
invariably at the top, like it says in RFC 5321.
* Both of them often add only Delivered-To when they rewrite an address or
forward mail internally. It is quite common to find Delivered-To
intermixed with other headers added along the way. See the example
below.
So here's a radical, different, new idea: let's just say Delivered-To
is a trace header. Because that's what it is.
R's,
John
== headers from a message that started on a postfix system and ended up on a
qmail system ==
Return-Path: <johnl(_at_)eaicheck(_dot_)services(_dot_)net>
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X-Spam-Status: No, score=-2.0 required=4.4 tests=BAYES_00,DKIM_SIGNED,
DKIM_VALID,DKIM_VALID_AU,SPF_HELO_PASS,SPF_PASS autolearn=ham
autolearn_force=no version=3.4.4
Delivered-To: johnl(_at_)iecc(_dot_)com
Received: (qmail 13481 invoked from network); 15 Feb 2021 20:40:01 -0000
Authentication-Results: iecc.com; spf=pass
spf.mailfrom=johnl(_at_)eaicheck(_dot_)services(_dot_)net
spf.helo=eaicheck.services.net smtp.remote-ip="108.161.133.214"; dkim=pass
header.d=eaicheck.services.net header.s=echo header.a=rsa-sha256
header.b="CRIguI7m"; dmarc=pass
header.from=eaicheck.services.net polrec.p=reject polrec.pct=100
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by mail1.iecc.com ([64.57.183.56])
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Received: by eaicheck.services.net (Postfix)
id 1ADD989349; Mon, 15 Feb 2021 15:40:00 -0500 (EST)
Delivered-To: johnl(_at_)eaicheck(_dot_)services(_dot_)net
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for <johnl(_at_)eaicheck(_dot_)services(_dot_)net>; Mon, 15 Feb 2021
15:40:00 -0500 (EST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=eaicheck.services.net;
h=to:subject:message-id:date:from; s=echo; bh=SrP2xzth3GnfaMOt7
cSHDvAgYRXQi2Hw/QlB/TmEnQg=; b=CRIguI7msBYf+96yigHcc5v3MF37ztRxd
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Lv4q1kZl5tbanpKBrIBVFDL5fZJQxZJEwLcmmH+g6UIXy+qWLHogmbVWHTICp1EN
dW35zH3VBi9IthzGoEr+w2Ok40lyqJqUdKElYFdas6Z9gIXnJLE3Sg7+J3j/Lo39
MOoyub363Wj4wYdZ3BGZa3sisPgi6Tj3WkkC2SGTp3AyrbcdXkbYtUte+Yn8LIm1
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