Email Authentication

Email authentication is the effort to equip messages of the email transport system with enough verifiable information that recipients can recognize the nature of each incoming message automatically. It differs from content filtering.

Read more about Email Authentication:  Rationale, Sender's IP Verification, Blacklisting, Controlling Users, Authenticating Senders, Difficulties With Email Forwarding, Criticism

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Email Authentication - Criticism
... “Authentication cannot stop spam, unless the cop/Reputation Service/Certificate Authority in charge revokes certificates for spamming ... ISPs would do that, then there would be no spam to need authentication to stop spam and so need for a CA playing cop ... Authentication involving TLS, SMTP-AUTH, or S/MIME cannot stop backscatter for the same reasons SPF, DKIM, and the rest were, are, and always will be powerless against it ...
... Domain-based Message Authentication, Reporting and Conformance or DMARC is a technical specification created by a group of organizations to help reduce the ... DMARC standardizes how email receivers perform email authentication using the well-known Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) mechanisms ... This means that senders will experience consistent authentication results for their messages at AOL, Gmail, Hotmail, Yahoo! and any other email receiver implementing DMARC ...