Action button not showing when sending to other gmail account

My ViewAction button is working fine when using the Apps Script to send the email to myself. (Same gmail account as logged in)

function testSchemas() {
  var htmlBody = HtmlService.createHtmlOutputFromFile('mail_template').getContent();

  MailApp.sendEmail({
    to: "[email protected]",
    subject: 'Test Actions in the Inbox - ' + new Date(),
    htmlBody: htmlBody    
  });
}

When setting another gmail account as recipient, the action button won't display. I've tried several gmail accounts.

By the look of it, testing schemas is currently only possible when sending to one self and not to other gmail accounts. Is this true?

My action button:

<html>
  <head>
    <script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "EmailMessage",
  "action": {
    "@type": "ViewAction",
    "name": "Test Action",
    "url": "https://mydomain.com/test"
  },
  "description": "Test action"
}
</script>
</head>
<body>
    <p>
      This a test for a Go-To action in Gmail.
    </p>
</body>
</html>

Working Headers:

Received-SPF: pass (google.com: domain of 3-fEJUhEJAJoG4LE.FIQ8.M6BQ8CTAG4CF.6IG@maestro.bounces.google.com designates 10.224.2.202 as permitted sender) client-ip=10.224.2.202
MIME-Version: 1.0
Message-ID: <[email protected]>
Date: Tue, 13 Aug 2013 08:44:41 +0000
Subject: Test Actions in the Inbox - Tue Aug 13 2013 10:44:41 GMT+0200 (CEST)
From: [email protected]
To: [email protected]
Content-Type: multipart/alternative; boundary=001a11c3e1827e3fef04e3d040f5

Not working headers:

Delivered-To: [email protected]
Received: by 10.76.9.231 with SMTP id d7csp139739oab;
        Tue, 13 Aug 2013 01:44:49 -0700 (PDT)
Return-Path: <[email protected]>
Received-SPF: pass (google.com: domain of [email protected] designates 10.236.38.106 as permitted sender) client-ip=10.236.38.106
Authentication-Results: mr.google.com;
       spf=pass (google.com: domain of [email protected] designates 10.236.38.106 as permitted sender) [email protected];
       dkim=pass [email protected]
X-Received: from mr.google.com ([10.236.38.106])
        by 10.236.38.106 with SMTP id z70mr1926602yha.29.1376383489428 (num_hops = 1);
        Tue, 13 Aug 2013 01:44:49 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:message-id:date:subject:from:to:content-type;
        bh=0ZsOg3hkpKeRGvrg8ym5j4ArBI++UJSNWp46KyrSIsU=;
        b=faCKadLjkifGzASnhw5FkjbOmo+brPDsEnzZuP5EmhzRxUzBoM2+7IM2oYTEvDDk7V
         Ib51o8EJ2g3sxP1yo6F+xdaldOcFZ65x3HiZn35hzyagzYHq/ASD/IJJb7rxQmYbmNM9
         zEMe71JAI1h/Wh9DJUG1vA7+AF83ApJwkeFZWOSRSKDBPAcOTZ7bIe2ymxJgp8mOq7mz
         /BLDtPPOoq4XZ5aeapEFUvMSpKCKkA/l5hlNk7Tnhv/EuEKl0RK7xYrnIXgtaFKgpRJ4
         hkaP+EaQNrFdj3WtvBNVeFl1VFcgHYu3padPKbkWTTBuCljICvot67ru6oX9IqrqGA8O
         bayA==
MIME-Version: 1.0
X-Received: by 10.236.38.106 with SMTP id z70mr1246078yha.29.1376383489312;
 Tue, 13 Aug 2013 01:44:49 -0700 (PDT)
Message-ID: <[email protected]>
Date: Tue, 13 Aug 2013 08:44:49 +0000
Subject: Test Actions in the Inbox - Tue Aug 13 2013 10:44:49 GMT+0200 (CEST)
From: [email protected]
To: [email protected]
Content-Type: multipart/alternative; boundary=089e01184c56f4944004e3d040e8

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