title: extracting email Received: headers with Python email package
body: <p>I'd like to extract the <em>Final</em> Received: email header from a message.  I have the Message as returned from <code>email.message_from_file()</code>.</p>
  
  <p>Using the <code>Message.get()</code> or <code>Message.get_item()</code> methods don't guarantee which of the many Received: headers I will get.  <code>Message.get_all()</code> returns them all, but doesn't guarantee an order.  Is there a way to be guaranteed to get the last one?</p>