This is an email server in a box. Using ldap authentication for imap, pop3, smtp, and SSL/TLS versions of each. Includes web user-interface, web administration, web filters. Installs on top of RedHat in under 20 minutes by running one script.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.