title: Run macro when email is sent
body: <p>I am trying to write a macro that looks at the subject line of an email whenever the user hits the Send button. </p>
  
  <p>However I can't find any documentation that listens to that button. For right now I am just trying to get it to send a <code>MsgBox</code> with the subject when the email is sent. Is there a way to listen (<em>thinking in terms of DOMs</em>) to this button and fire a macro on the click.</p>