title: How to let users to block private messages in Django-postman?
body: <p>I have instlled django-postman but it works great. However some I'd like to allow users to opt for not receiving any private messages. I'm wondering how the easiest way to do so?</p>
  
  <p>I've looked at the <a href="http://django-postman.readthedocs.org/en/latest/quickstart.html" rel="nofollow">docs</a> but could not find such settings so I guess it requires some hacking the source but I'm not sure where and how it should be applied. So appreciate your hints. </p>