At the University of Durham, one of the e-mail products we support is called IMP. This product is accessed using a WWW browser. It provides the visitor with a login screen and, once he/she has authenticated, IMP uses IMAP to contact the machine containing their e-mail. So the product enables a member of the University to handle their e-mail, e.g., to look at their messages, store messages, reply to messages, and compose messages. And they can do this on any machine anywhere in the world provided it has a WWW browser. All the code of IMP is written in PHP.

For more details about IMP, go to: http://www.horde.org/imp/