title: PNG Alpha transparency in email
body: <p>Is there support for PNG alpha transparency for popular email clients?</p>
  
  <p>Here are the list of major e-mail clients i'm planning to support:</p>
  
  <p>Web based*</p>
  
  <ul>
  <li>Gmail</li>
  <li>Hotmail</li>
  <li>Yahoo</li>
  </ul>
  
  <p>Software based</p>
  
  <ul>
  <li>Outlook 2007/2010</li>
  <li>Windows Mail</li>
  <li>Mac OSX Mail</li>
  <li>Thunderbird</li>
  </ul>
  
  <p>Mobile based</p>
  
  <ul>
  <li>iOS Device Mail</li>
  <li>Android Device Mail</li>
  </ul>
  
  <p>*<em>This is browser-based, so no need to worry about this</em></p>
  
  <p>From the research i've done, it seems all (mobile-based isn't listed, but i checked my phones) support PNG (<a href="http://en.wikipedia.org/wiki/Comparison_of_email_clients#Messages_features">http://en.wikipedia.org/wiki/Comparison_of_email_clients#Messages_features</a>).  But, I'm unsure as to whether or not they support transparency.    Anyone have any good insight into this?</p>