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.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release conforms to RFC3834 in that it will never reply
to msgs containing owner-*, request-*, or MAILER-DAEMON,
and prepends "Auto:" to the subject of probe messages.