I am using [private message][1] module to send an e-mail to all users. When I send, users can able to see the message in site only after logging in. 

There is an email notification settings in private message module. What is the settings to send mail to user using private message? 

Below screen shot show the settings of email notification.[![enter image description here][2]][2]


[![enter image description here][3]][3]


  [1]: https://www.drupal.org/project/privatemsg
  [2]: https://i.sstatic.net/nJ3lc.png
  [3]: https://i.sstatic.net/diYmv.png