WP-Internal-Mail is a web-based mail system similar to gmail, yahoo, etc, without a pop interface. It will transform your site into a mailbox using p
Have your site have it's own users ability to send mail to other users on the site. They can keep mail, label, and send it all while within the site. This can speed up not only workflows for editors and contributers but also work to increase the social apsects of your site. It's functionality is similar to that of many sites that use internal mail like facebook, gmail.