As a free, open-source solution, IMP Webmail has been around since 1998, giving ISPs an enormous amount of flexibility in maintaining a webmail offering.
There are currently three branches of IMP. IMP 4.0 is the current production version of the stable branch . It requires PHP 4.3.0 and version 3.x of the Horde framework. It adds new features like crypting support, flexible charset handling, virtual folders for saved searches, a WYSIWYG editor for creating HTML messages, improved MIME message handling, and many more.
IMP 3.2.8 is the current production version of the previous stable branch . It requires PHP 4.1.0 and version 2.0 of the Horde framework. It adds advanced features such as searching multiple mailboxes, identities, and a hierarchical mailbox navigator, as well as a cleaner, redesigned user interface. As with IMP 2.2 before it, it passes the "MIME Torture Test" that UW makes available .
IMP is the Internet Messaging Program, one of the Horde applications. It provides webmail access to IMAP and POP3 accounts. The Horde Project writes web applications in PHP and releases them under Open Source licenses. For more information (including help with IMP) please visit http://www.horde.org/. This application can only be installed into VE of Unlimited class, as Light class VE resources are not sufficient. Note that PHP and uw-imap application templates are required. This release includes Turba - Horde address book. Please note that Turba requires MySQL template to be installed into the Virtual Environment. If MySQL is not installed, address book functionality will not be available. [ more info ]