The amazing deluge of spam and Internet scams using forged headers has spurred interest in a "better mousetrap." One such project is AMTP at http://amtp.bw.org/, an enhancement for SMTP. This specification calls for mail servers needing a signed security certificate and using TLS (Transport Layer Security, RFC 2246). An AMTP mail server will not relay mail from an "untrusted source"in other words, a mail server lacking the proper authentication. Although not eradicating spam, AMTP does provide a mechanism to identify the source.
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