Headers and Trust Relationships

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We mentioned how headers should never be trusted or treated as a reliable source of information. This gives rise to a big need for how to effectively filter out or deny unauthorized email, because, as we stated earlier, you should only relay email from local or trusted sources.

Two protocols have been recently introduced for validating external emails: Sender Policy Framework (SPF) and DomainKeys. The two systems involve different parts of the email message and can be used simultaneously.

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