Download SquirrelMail Script

SquirrelMail is a standards based webmail package written in PHP4. It includes built-in pure PHP support for the IMAP and SMTP protocols.
Price: free
Demo (Sanp Shoot)
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Publisher Website

Download Secure Messaging Script

Secure Messaging is a simple method of sending and receiving messages across the web using alternative web-based mail system. Only an optional message notice is sent to the recepient, the user needs to visit the site in order to read the message.
Price: free
Demo (Snap Shoot)
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Publisher Website

Download T-dah Email Script

T-dah is an Open Sourced  Webmail  developed by Aldoir Ventura. It is free and can be installed on any PHP.serve.
Price: free
Demo
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Publisher Website

Download Roundcube Webmail Script

Roundcube is a open source webmail which is easy to install/configure and that runs on a standard LAMPP server. Roundcube includes other open-source projects such as PEAR, IMAP, TinyMCE, Googiespell, WasHTM.
Price: free
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Publisher Website

Download DracMail Email Script

DracMail is a webmail interface built using PHP, ExtJS, IAMP and MySQL.
Features include: WYSIWYG editor, HTML mail composing and message caching.

Price: free
Demo Username: demo [at] dracmail.net and Password: demo
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Publisher Website

Download Conjoon Webmail Script

Conjoon is a web based personal information manager with strong webmail capabilities. Its ambition is to become a web based groupware, but conjoon rather takes two small steps one after another instead of five at once.
Price: free
Demo
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Publisher Website

Download RainLoop WebMmail Script

You are free to use RainLoop for your personal or non-profit projects. Modest system requirements, decent performance, simple installation and upgrade, no database required - all these make RainLoop Webmai.
Price: free
Demo
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Publisher Website

Working:
Login with any yahoo, gmail, outlook ids for other config them into admin panel
Configuration:
visit http://yourdomain.com/?admin Login in with username admin and password 12345