dracMail Webmail Script is a webmail interface built using PHP, ExtJS (JavaScript framework), MySQL and IMAP. Features include: Rich UI, WYSIWYG editor, HTML mail composing and message caching. The developer’s original purpose for this project was to learn more about ExtJS, however it turned out to be a very reliable webmail interface so they are making it open source for everyone. So if you have always wanted to create a Hotmail or Gmail clone, dracMail webmail script may be a good place to start in a simplified manner.