SquirrelMail is a web-based email application started by Nathan and Luke Ehresman. and written in the PHP scripting language. It can be installed on almost all web servers as long as PHP is present and the web server has access to an IMAP and SMTP server.
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It is a fast IMAP client which has a browser-based AJAX client so you can access it from anywhere to read your email.
It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking. RoundCube Webmail is written in PHP and requires a MySQL or Postgres database. The user interface is fully skinnable using XHTML and CSS 2.
It supports SMTP authentication. It can handle both protocols (POP3/IMAP) and the defaul protocol can be changed from a single configuration file. Postaci is platform independent. It can work on any operating system which supports PHP.