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Question DKIM: NEUTRAL with domain null

NicolasP.

Regular Pleskian
Hello.

OS: ‪Ubuntu 16.04.3 LTS‬
Product: Plesk Onyx Version 17.5.3 Update #20
SMTP: Postfix
IMAP: Dovecot

Why I am getting DKIM Neutral at gmail?
I have activated all (SPF, DMARC, DKIM)

Here is my header of gmail:

Delivered-To: ******@gmail.com
Received: by 10.100.181.234 with SMTP id r97csp4092487pjb;
Mon, 28 Aug 2017 04:37:22 -0700 (PDT)
X-Received: by 10.223.150.71 with SMTP id c7mr228149wra.192.1503920242815;
Mon, 28 Aug 2017 04:37:22 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1503920242; cv=none;
d=google.com; s=arc-20160816;
b=U3uhWnpxV/ic9IYQyr3xaxAqMMRxTNXwGcYCWRUcDR+CqXdaFVv5itgIY6FH8wH/Hz
4GLCR9mxQjWyMp/lCfQcDtZmanYL9xiBl2wS3Xd380vyrlx6Bl9dfXjrgWYX9uKdryKf
w5pH0kKAxetHOwJpGqGmvb18RA1NYKGFN1sc6XnBjOztWf1rHf8tN38p1qxTL5DlupLP
pLws/lmO6lQhHwegZWgePoCEwA1qVs8KLlZTD+eR5RLkvoMJ6R/dyuIwKkJ7PEjRDGwI
+RAl2LIUiTG0ta7DeCdw5Ckm2A2v6QtP7xYc8hdPHs+/zBEIhwDPbuQTS1HpHebSE+d8
YKNA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=user-agent:message-id:subject:to:from:date:mime-version
:dkim-signature:arc-authentication-results;
bh=XNe4c2DCwuvRDCsPGhSRG7LaeZ/03sccDo/B5Py4BNg=;
b=BidQkOkFahRwzwYRHLbuLeLRNuPdSlBVuOraR4qKaUqQKzRQtWhSrZZyh5dvvdi5NI
i7RMYFy/VhWe7Ks/QaJM8FPsXkdT6VqepV9TaIk0LiRM0Jcot7Dc74UnGsFGd+JA7zu0
yZute60ekhAgxfxOj1CXa5TjI8fvtdRuNALSWG21EbrLCuw2vJAMUr2pDpHkj99R47zc
MtfC35sSwb4K/eVi6RhNmHL62mkt+48fK1N/6xsVXGbWXYHC8gZ27OAjR/42u95mCBkq
CoFaf/B2bsrm9K2StRQQ4WyetrFst81uFlwHT4k24UiPxzpDY7nPw8VKMcS4+m0Dlt1o
Ksxw==
ARC-Authentication-Results: i=1; mx.google.com;
dkim=neutral (bad format) [email protected] header.s=default header.b=dfhcEoRI;
spf=pass (google.com: domain of [email protected] designates 92.51.180.237 as permitted sender) [email protected];
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=papazetis.com
Return-Path: <[email protected]>
Received: from papazetis.com (server.papazetis.com. [92.51.180.237])
by mx.google.com with ESMTPS id 36si148968wrw.440.2017.08.28.04.37.22
for <*********@gmail.com>
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Mon, 28 Aug 2017 04:37:22 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 92.51.180.237 as permitted sender) client-ip=92.51.180.237;
Authentication-Results: mx.google.com;
dkim=neutral (bad format) [email protected] header.s=default header.b=dfhcEoRI;
spf=pass (google.com: domain of [email protected] designates 92.51.180.237 as permitted sender) [email protected];
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=papazetis.com
Received: from webmail.terrahosting.gr (localhost.localdomain [IPv6:::1]) by server.papazetis.com (Postfix) with ESMTPA id E867C1613BE for <**********@gmail.com>; Mon, 28 Aug 2017 14:37:21 +0300 (EEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=papazetis.com; s=default; t=1503920242; bh=XNe4c2DCwuvRDCsPGhSRG7LaeZ/03sccDo/B5Py4BNg=; l=537; h=From:To:Subject; b=dfhcEoRIl4tq1N2BqIn0Tv4CJaK3qjFfti0uCQabF/TxPHt5jP8C0jzK1izYPgckj
T6ikxb57ukoXgiOLSxS48BtFxk29VXanWNDAe3r9Ts7c8Rgj1Xb0lzudqTcBFPy9hs
JQ7/pAKHtt74WYmpHYoCEnx1dN/PJSHqSCQvM9Fg=
Authentication-Results: server.papazetis.com;
spf=pass (sender IP is ::1) [email protected] smtp.helo=webmail.terrahosting.gr
Received-SPF: pass (connection is authenticated)
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="=_768e03b5d16c115df5c796fa575787e0"
Date: Mon, 28 Aug 2017 12:37:21 +0100
From: [email protected]
To: *********@gmail.com
Subject: sdkfh aksdhf lkhasdlkfhl
Message-ID: <[email protected]>
X-Sender: [email protected]
User-Agent: Roundcube Webmail/1.2.5
X-PPP-Message-ID: <[email protected]>
X-PPP-Vhost: papazetis.com

--=_768e03b5d16c115df5c796fa575787e0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=US-ASCII

ksd fkhaslkdfasdfa sdfasd
--=_768e03b5d16c115df5c796fa575787e0
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
<p>ksd fkhaslkdfasdfa sdfasd</p>

</body></html>

--=_768e03b5d16c115df5c796fa575787e0--

I tested my email with Newsletters spam test by mail-tester.com and I am getting 10/10
 
DKIM headers are removed when email is forwarded through GMail. In fact, when you get your DMARC reports tomorrow, you'll see a FAIL for DKIM on any email that is forwarded to another domain (eg. abc.com -> [email protected]). This drove me nuts as well, thinking my DKIM settings weren't correct.

Checking your DKIM record here > Check a DKIM Core Key and you've got it configured perfectly according to the DKIM gurus, which is also why you're getting a 10/10 on mail-tester.

Send an email from your domain to another email address on your domain and you'll see a perfect result.
 
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