If this plugin is useful, could You please help me rate it? it will be a big encouragement to improve for me 
Introduction
- Jigoshop Ajax Private Message (JAPM) is a WordPress plugin, Jigoshop’s addon, which can be used for communication, JAPMallow the Members or the Guest on your site send private messages to product’s author, whom post the products, and The Author can reply the Message to the Users/Guest, The User will receive the notification via email.
- All features handle by Ajax to increase the processing speed and improve efficiency, create a smooth feeling for user.
Demo:
Test as the Member/Guest:
http://jigoshop.wpoffice.net/product/maecenas-in-ligula-tristique-dapibus-augue-a-auctor-nulla/
Test as products’ Author/Shop Manager
Login URL: http://jigoshop.wpoffice.net/wp-login.php
User: author
Password: 1234
Features:
- Allow Guest send messages
- Messages thread.
- Recaptcha support.
- Wp Editor Composer.
- Email template notifications.
- Enable/Disable Sending Message per post.
- Ajax handling.
- Easy Installation and Management.
- API support
Screenshots
Changelog
09/30/2013
Initial Release