title: post_save in the admin
body: <p>I have a application that i exclusively use with the admin.</p>
  
  <p>I would like to send an email every time that a new object is created/modified, from my search, it seems that using the post_save would be the best way.</p>
  
  <p>Unfortunately the doc is not really clear on that...</p>
  
  <p>Can someone explain me > maybe with an example ?</p>
  
  <p>Thanks</p>