CipherMail encrypted PDFs getting caught by Google's spam filter

Hello Martijn & Everyone ~

Seems that Google’s mail services are putting our CipherMail encrypted PDFs in the spam folder. Here is a copy of the raw source of a “spam” message. Any thoughts on how we can try to avoid overzealous spam filters from ruining our good times?

(Also, I changed a couple things to create some little bit of anonymity here, but nothing that should really change the outcome of the spam engine that Google uses.)

Delivered-To: paraviz(a)gmail.com
Received: by 10.237.36.34 with SMTP id r31csp1815383qtc;
        Tue, 19 Jul 2016 17:42:32 -0700 (PDT)
X-Received: by 10.98.38.4 with SMTP id m4mr16648999pfm.47.1468975352002;
        Tue, 19 Jul 2016 17:42:32 -0700 (PDT)
Return-Path: <lpeterson(a)tombadinmd.com>
Received: from cipher0.paravis.net (cipher0.paravis.net. [199.19.158.164])
        by mx.google.com with ESMTPS id o90si66638pfj.222.2016.07.19.17.42.30
        for <paraviz(a)gmail.com>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Tue, 19 Jul 2016 17:42:30 -0700 (PDT)
Received-SPF: pass (google.com: domain of lpeterson(a)tombadinmd.com designates 199.19.158.164 as permitted sender) client-ip=199.19.158.164;
Authentication-Results: mx.google.com;
       spf=pass (google.com: domain of lpeterson(a)tombadinmd.com designates 199.19.158.164 as permitted sender) smtp.mailfrom=lpeterson(a)tombadinmd.com
Received: from cipher0 (localhost [127.0.0.1])
  by cipher0.paravis.net (Paravis) with ESMTP id D92E642CC0
  for <paraviz(a)gmail.com>; Tue, 19 Jul 2016 17:42:29 -0700 (PDT)
Received: from cipher0.paravis.net ([IPv6:::ffff:127.0.0.1])
  by localhost (cipher0.paravis.net [::ffff:127.0.0.1]) (amavisd-new, port 10024)
  with ESMTP id YJ7xi3XqWB8w for <paraviz(a)gmail.com>;
  Tue, 19 Jul 2016 17:42:28 -0700 (PDT)
Received: from www0.paravis.net (www0.paravis.net [10.0.1.24])
  by cipher0.paravis.net (Paravis) with ESMTP id 2A93F42CC0
  for <paraviz(a)gmail.com>; Tue, 19 Jul 2016 17:42:28 -0700 (PDT)
Content-Type: multipart/mixed; boundary="=-c01bf9b4-c308-44d4-9be8-a1217d4ef990"
MIME-Version: 1.0
Message-ID: <569d-578ec900-5-24c27100(a)171681020>
X-Virus-Scanned: Debian amavisd-new at cipher0.paravis.net
X-Forward: 10.0.2.165
date: Tue, 19 Jul 2016 17:42:28 -0700
User-Agent: SOGoMail 2.3.3a

--=-c01bf9b4-c308-44d4-9be8-a1217d4ef990
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: quoted-printable

Hello,

This message contains a PDF file encrypted with AES-128. The password for
the PDF file can be retrieved by logging into the Paravis Cipher portal.

You can read the message by following these steps:

1. Click the link below.

2. Log in to the site with your password.

3. Press 'generate' to generate the decryption password.

4. Copy the generated password.

5. Open the attached PDF file, and paste the password in the password box.

https://cipher.paravis.corp/web/portal/secure/otp?id=3D1137177361&pwl=3D16&email=3Dparaviz%40gmail.com

The password ID of this email is: 1137177361

Thank you,

Laz Peterson

···

Subject: testing
from: "Laz Peterson" <lpeterson(a)tombadinmd.com>
to: paraviz(a)gmail.com

---
Sent by CipherMail

--=-c01bf9b4-c308-44d4-9be8-a1217d4ef990
Content-Disposition: attachment; filename=encrypted_1137177361.pdf
Content-Type: application/pdf; name=encrypted_1137177361.pdf
Content-Transfer-Encoding: base64
X-Djigzo-Marker: attachment

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--=-c01bf9b4-c308-44d4-9be8-a1217d4ef990--

~ Laz Peterson
Paravis, LLC