title: How to successfully embed images in HTML for display in webmail clients?
body: <p>I'm trying to do a signature in HTML using images that are encoded in base 64 data URLs.
  Here's an example:</p>
  
  <pre><code>&lt;img src="data:image/png;base64,iVBORw0KGgoAAAAN...kJggg=="&gt;
  </code></pre>
  
  <p>It's working nice with mail software as Mail on Mac or Thunderbird but it's not working with webmail such as gmail, outlook, roundcube , hotmail ...</p>
  
  <p>Have you any idea how to make it work ?
  I really want to put those images directly in the source code, it's more practical. </p>