Clean_mail is a series of shell and Perl scripts that help a system administrator maintain mail spool files on a large system. They offer deleting of old mails, backup, deleting of spam, automatic mails to users, etc.
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.