title: Repeating background-image in Outlook 2007/2010/2013 and Gmail
body: <p>I have an HTML email with a <code>&lt;td&gt;</code> of dynamic height but fixed width.</p>
  
  <p>How can I add a (vertically) repeating background-image to this cell that works in Outlook 2007, 2010, 2013 and Gmail as well?</p>
  
  <p>The cell doesn't have any content in it, since it is "just" for visual purposes. But it is next to my content cell and thus needs to be dynamic in height.</p>