Re: dmarc failure when sending to the list

From: Murray S. Kucherawy <msk_at_blackops.org>
Date: Wed, 9 Jul 2014 23:56:28 -0700 (PDT)

On Thu, 10 Jul 2014, Patrick Proniewski wrote:
> Well, in fact I'm sending "Content-Transfer-Encoding: quoted-printable",
> which is 7bit but the opendkim list server convert to
> "Content-Transfer-Encoding: 8bit". You can check that pretty easily as
> you're in To: of this reply, and the list is Cc:. You'll get my message
> twice, with different Content-Transfer-Encoding.

The version that went through the list server failed, though it was fine
when it hit the list server:

Authentication-Results: medusa.blackops.org;
     dkim=pass (1024-bit key; unprotected) header.d=opendkim.org
     header.i=opendkim-users-bounce_at_lists.opendkim.org header.b=krucQ4TK;
     dkim=fail reason="no signature error" (1024-bit key; unprotected)
     header.d=patpro.net header.i=_at_patpro.net header.b=rWUgYVWH;
     dkim-adsp=unknown (unprotected policy); dkim-atps=neutral

Authentication-Results: mx.elandsys.com; dkim=pass
     reason="1024-bit key; unprotected key"
     header.d=patpro.net header.i=_at_patpro.net header.b=rWUgYVWH;
     dkim-adsp=pass

So some content was altered as it passed through the list that caused the
author signature to be invalid. The list signature is fine though.

-MSK
Received on Thu Jul 10 2014 - 06:56:48 PST