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This is a reference implementation of Identified Internet Mail (IIM) - 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.
Please note that Identified Internet Mail is an obsolete specification -- it was merged with Yahoo! DomainKeys to form the basis for DomainKeys Identified Mail (DKIM), an IETF standard described in RFC 6376. The IIM specification and implementation are primarily for historical interest.