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Penny Post is a system to combat spam emails by making the sender "pay for email" by spending a few seconds of computing time. Outgoing mail is marked with postage stamps that convince the receiver that the sender is genuine.
This is a reference implementation of Identified Internet Mail - a signature based message authentication mechanism that can be used to combat phishing and spam.
The package includes a sendmail milter and a key registration server.
This project is obsolete andhas been superseded by DomainKeys Identified Mail (DKIM). It is primarily of historical interest.