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Submission + - Stopping Spam by Authenticating all Email

Michael G. Kaplan writes: Preventing spam would be much easier if all email were authenticated – currently an impossibility because at a minimum this would require the perfect ongoing manual participation of every domain administrator in the world. Universal email authentication will only become a reality by obviating the need for this manual participation. This might be possible via a method that allows the email sending computers to autonomously apply authenticating digital signatures.
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Stopping Spam by Authenticating all Email

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If A = B and B = C, then A = C, except where void or prohibited by law. -- Roy Santoro