title: How do you handle subscription confirmation links in Django?
body: <p>In my application, when people sign up, they just enter their email adress.
  a User is created in Django, and the "is_confirmed" field is set to False.</p>
  
  <p>Just after this, I'd like to send to the new user an email with a link to click.
  That link should allow this new user to enter complementary information, and choose a password before definitive sign up.</p>
  
  <p>The questions are:</p>
  
  <ul>
  <li>how to generate these links in Django? (I suppose these links should be unique and kind of secured sothat no one can "guess" the URL)</li>
  <li>Where do you trigger the mail sending? (signals? <code>save()</code>user method? Other?)</li>
  </ul>
  
  <p>Thanks!</p>