Theodore Ts'o <tytso(a)mit.edu> writes:
That way only people who are using mail systems with
DMARC get their
From field munged, instead of punishing everyone using the mailing
list.
Why should anyone need to? Of all the mailing lists I'm on, this one is
the only one that has this problem. For instance, on the NetBSD mailing
lists, my email reaches other recipients "From:" my real email address,
and SPF, DKIM, and DMARC all check out clean. Here are the headers from
a message I sent to a NetBSD list, as received by my own system (whereas
the message I sent to the TUHS list last night was refused by my MTA):
| Return-Path: <bounces-current-users-owner-tih=hamartun.priv.no(a)NetBSD.org>
| Received: from 127.0.0.1 (HELO barsoom.hamartun.priv.no) by
| barsoom.hamartun.priv.no (Archiveopteryx 3.2.0) with lmtp id
| 1490255725-9579-11611/4/764 for tih(a)hamartun.priv.no; Thu, 23 Mar 2017
| 07:55:25 +0000
| Received: from
mail.netbsd.org (
mail.NetBSD.org [IPv6:2001:470:a085:999::25])
| (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
| (No client certificate requested)
| by barsoom.hamartun.priv.no (Postfix) with ESMTPS id 3CA3B1C7147
| for <tih(a)hamartun.priv.no>; Thu, 23 Mar 2017 08:55:23 +0100 (CET)
| Authentication-Results: barsoom.hamartun.priv.no; dmarc=pass
header.from=hamartun.priv.no
| Authentication-Results: barsoom.hamartun.priv.no; spf=pass
smtp.mailfrom=bounces-current-users-owner-tih=hamartun.priv.no(a)NetBSD.org
| Authentication-Results: barsoom.hamartun.priv.no;
| dkim=pass (1024-bit key) header.d=hamartun.priv.no header.i=(a)hamartun.priv.no
header.b=Kykpwg+N
| Received: by
mail.netbsd.org (Postfix, from userid 605)
| id 91AF78559D; Thu, 23 Mar 2017 07:55:16 +0000 (UTC)
| Delivered-To: Current-Users(a)netbsd.org
| Received: from localhost (localhost [127.0.0.1])
| by
mail.netbsd.org (Postfix) with ESMTP id 04AC385569
| for <Current-Users(a)netbsd.org>; Thu, 23 Mar 2017 07:55:15 +0000 (UTC)
| X-Virus-Scanned: amavisd-new at
netbsd.org
| Authentication-Results:
mail.netbsd.org (amavisd-new);
| dkim=pass (1024-bit key) header.d=hamartun.priv.no
| Received: from
mail.netbsd.org ([127.0.0.1])
| by localhost (
mail.netbsd.org [127.0.0.1]) (amavisd-new, port 10025)
| with ESMTP id 07zfmByWfGGy for <Current-Users(a)netbsd.org>;
| Thu, 23 Mar 2017 07:55:14 +0000 (UTC)
| Received: from barsoom.hamartun.priv.no (barsoom.hamartun.priv.no [193.71.27.8])
| (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
| (No client certificate requested)
| by
mail.netbsd.org (Postfix) with ESMTPS id C3DAC84CDD
| for <Current-Users(a)netbsd.org>; Thu, 23 Mar 2017 07:55:12 +0000 (UTC)
| Received: from thuvia.hamartun.priv.no (thuvia.hamartun.priv.no [193.71.27.7])
| (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
| (No client certificate requested)
| by barsoom.hamartun.priv.no (Postfix) with ESMTPS id 88A601C7147;
| Thu, 23 Mar 2017 08:55:09 +0100 (CET)
| Dkim-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hamartun.priv.no;
| s=barsoom; t=1490255709;
| bh=CSM3cuXAMyJtu0wLEPB+K0BzqULiVelaGy5gTvWwfpU=;
| h=From:To:Cc:Subject:References:Date:In-Reply-To;
| b=Kykpwg+NK0kSkDYEkvrISX7fDtK9tYUogDcyAb0cSd1ogwCIYnAFSWKg3mnlJb+9g
| urP7MuokAxM2gUJeVqGdosqAjncrfMQYt0ii8Ops3Awx9q/Dx3bmDyEz8jMUIQxWmw
| oiCiL1ZkcjF/xGKvrV97jRW3BvVCzpRyZfO4ad1I=
| Received: by thuvia.hamartun.priv.no (Postfix, from userid 501)
| id 707E34DE48; Thu, 23 Mar 2017 08:55:09 +0100 (CET)
| From: Tom Ivar Helbekkmo <tih(a)hamartun.priv.no>
| To: Paul Goyette <paul(a)whooppee.com>
| Cc: Current-Users(a)netbsd.org
| Subject: Re: Error/warning message from rc.d/npf
| References: <Pine.NEB.4.64.1703231345500.401(a)speedy.whooppee.com>
| Date: Thu, 23 Mar 2017 08:55:09 +0100
| In-Reply-To: <Pine.NEB.4.64.1703231345500.401(a)speedy.whooppee.com> (Paul
| Goyette's message of "Thu, 23 Mar 2017 13:55:01 +0800")
| Message-Id: <m2wpbg1l7m.fsf(a)thuvia.hamartun.priv.no>
| User-Agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/24.5 (berkeley-unix)
| Mime-Version: 1.0
| Content-Type: text/plain
| Sender: current-users-owner(a)NetBSD.ORG
| List-Id:
current-users.NetBSD.org
| Precedence: bulk
| Content-Transfer-Encoding: quoted-printable
-tih
--
Most people who graduate with CS degrees don't understand the significance
of Lisp. Lisp is the most important idea in computer science. --Alan Kay