LIMeTool (pronounced like the fruit), is intended to be a simple and easy interface for managing accounts on an integrated Sendmail/LDAP/Cyrus IMAP installation. It's written in PHP and is realitively easy to configure and expand.
This is a set of programs that allows you to create your own WebMail with sendmail & procmail & imapd & webmail with dynamic sql users and mailbox limitations. You can control your users through web, view statistic, and other.