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rfcs

resource summary
RFC 5321 Simple Mail Transfer Protocol
RFC 5322 Internet Message Format
RFC 6854 Update to Internet Message Format
RFC 7208 Sender Policy Framework (SPF)
RFC 7372 Email Authentication Status Codes
RFC 6376 Domain Keys Identified Mail (DKIM) Signatures
RFC 7489 Domain-based Message Authentication, Reporting, and Conformance (DMARC)
RFC 6854 Email Authentication for Internationalized Mail

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