Internet Messaging Program

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Internet Messaging Program (IMP)

Developer(s)	The Horde Core Team
Initial release	1998; 26 years ago (1998)
Stable release	6.2.27[1]  / 27 August 2020
Written in	PHP
Operating system	Cross-platform
Available in	English, German and many others (multilingual)[2]
Type	Webmail
License	GPL-2.0-only
Website	www.horde.org/apps/imp

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 GPL-2.0-only license.