imp4 binary package in Ubuntu Precise i386

 IMP is the Internet Messaging Program (formerly, among other things, the IMAP
 webMail Program), a PHP-based webmail system and a component of the Horde
 project. IMP, once installed, accesses mail over IMAP thus requiring little
 to no special preparations on the server on which mail is stored.
 .
 IMP offers most of the features users have come to expect from their
 conventional mail programs, including attachments, spell-check, address books,
 multiple folders, and multiple-language support.

Source package