title: python email get values for multiple headers of the same name
body: <p>I'm using python's <code>email.message_from_string</code> to parse a raw email message. However, the message has multiple "Recieved" headers in it. When I call <code>message.keys()</code> their are clearly several Recieved headers. But when I try message.get("Recieved") I just get <code>""</code> a null string. How do you get the values of those instances of that header?   </p>