title: Email signature in gmail showing images as attachments
body: <p>We've built a custom HTML email which will be used as an email signature for Office 365 accounts. During testing we notice that when the signature is sent to a Gmail account, Gmail shows 2 of the 9 images as attachments. To test I copy the contents of the HTML file and paste it into a new email. Sending it to another Outlook email works perfectly fine too. </p>
  
  <p>An example of the code which wraps an image that displays as an attachment:</p>
  
  <pre><code>&lt;table style="width: 480px; font-size: 9pt; font-family: Arial, sans-serif; line-height:14px; " cellpadding="0" cellspacing="0"&gt;
      &lt;tbody&gt;
      &lt;tr&gt;
          &lt;td style="width:125px; vertical-align: middle" valign="middle" align="center"&gt;
              &lt;a target="_blank" href="https://www.google.co.uk"&gt;
                  &lt;img border="0" width="88" height="88" style="width:88px; height:88px; border:0;" src="http://an-example-image.png" alt="Example logo"&gt;&lt;/a&gt;
          &lt;/td&gt;
      &lt;/tr&gt;
      &lt;/tbody&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p>The images are being served from an S3 bucket over https.</p>
  
  <p>Any help would be much appreciated.</p>
  
  <p><strong>Update:</strong> Making the images as .JPG has fixed one of them.</p>