The steps are fairly straight forward:
1) Setup the database (scripts are included in the code download).
2) Customize the settings for your needs in config.inc.php.
3) Upload to the server.
4) Hit
www.yourdomain.com/AjaxMail
Nicholas C. Zakas
Author, Professional JavaScript for Web Developers (ISBN 0764579088)
http://www.nczonline.net/