Email Users is a plugin for WordPress that allows sending mails to registered users. Depending on the capabilities they have, users can:<br>
<br>
    * Send a mail to a single user<br>
    * Send a mail to multiple users<br>
    * Send a mail to a selection of user groups (based on the user roles)<br>
    * Notify other users of a post or a page<br>
<br>
Visit <a href="http://www.vincentprat.info/dev/email-users/" target="new">Plugin Homepage</a>