Email Secretary is a Challenge/Response system designed to deter spam.
Written entirely in Perl, it is highly configurable and easy to modify.
It has a Web GUI to manage your whitelists, blacklists, and pending
messages.
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.
