title: Hyperlink is not clickable in gmail
body: <p>I tried to put a HTML hyperlink like this </p>
  
  <pre><code>&lt;a href="test-app://param=123"&gt;Click here&lt;/a&gt;
  </code></pre>
  
  <p>in my HTML email template and sent it using java mail library. When I open that email in my gmail, it displays "Click here" but the link is not clickable. It's just &lt;a&gt;Click here&lt;/a&gt; (the part "href="test-app://param=123" is removed). It works well when I replace the link in href by the links like www.google.com. 
  <br/>
  <br/>
  Please help</p>