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What is IMP?


IMP, the Internet Mail Program, is one of the most popular and widely deployed open source webmail applications in the world. It allows universal, web-based access to IMAP and POP3 mail servers and provides Ajax, mobile and basic interfaces with a rich range of features normally found only in desktop email clients, including attachments, spell-check, address books, multiple mailboxes, and multiple-language support.

This software is OSI Certified Open Source Software. OSI Certified is a certification mark of the Open Source Initiative.

1   Obtaining IMP

Further information on IMP and the latest version can be obtained at:

2   Documentation

The following documentation is available in the IMP distribution:

README:This file
LICENSE:Copyright and license information
doc/CHANGES:Changes by release
doc/CREDITS:Project developers
doc/INSTALL:Installation instructions and notes
doc/UPGRADING:Pointers on upgrading from previous IMP versions

3   Installation

Instructions for installing IMP can be found in the file INSTALL in the doc/ directory of the IMP distribution.

4   Assistance

If you encounter problems with IMP, help is available!

The Horde Frequently Asked Questions List (FAQ), available on the Web at

Horde LLC runs a number of mailing lists, for individual applications and for issues relating to the project as a whole. Information, archives, and subscription information can be found at

Lastly, Horde developers, contributors and users also make occasional appearances on IRC, on the channel #horde on the Freenode Network (

5   Licensing

For licensing and copyright information, please see the file LICENSE in the IMP distribution.


The IMP team