Internet Messaging Program
The Internet Messaging Program or IMP is a webmail client. It can be used to access e-mail stored on an IMAP server. IMP is written in PHP and a component of the collaborative software suite Horde.
It is included with cPanel and Plesk installations as a webmail client. It often integrates email, calendar, address book, notes, tasks, filters and a newsreader with cPanel.
Internet Messaging Program is free and open-source software subject to the terms of the GNU General Public License (GPL).
Current features
Dynamic (AJAX) view
Mobile smartphone view
Minimal (text-only) view
HTML message composition with a cross-browser WYSIWYG editor
Drag/drop attachment support into WYSIWYG editor
HTML signatures
High performance
Robust IMAP support, utilizing advanced server features
Flexible message search
Address autocompletion
Spell checking
Sending of attachments via download link, instead of embedding in message
Thread view
Message previews in mailbox view