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RFC 1123 – Requirements for Internet Hosts—Application and Support (STD 3)

RFC 1870 – SMTP Service Extension for Message Size Declaration (îbsoletes: RFC 1653)

RFC 2505 – Anti-Spam Recommendations for SMTP MTAs (BCP 30)

RFC 2920 – SMTP Service Extension for Command Pipelining (STD 60)

RFC 3030 – SMTP Service Extensions for Transmission of Large and Binary MIME Messages

RFC 3207 – SMTP Service Extension for Secure SMTP over Transport Layer Security (obsoletes RFC 2487)

RFC 3461 – SMTP Service Extension for Delivery Status Notifications (obsoletes RFC 1891)

RFC 3462 – The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages (obsoletes RFC 1892)

RFC 3463 – Enhanced Status Codes for SMTP (obsoletes RFC 1893 )

RFC 3464 – An Extensible Message Format for Delivery Status Notifications (obsoletes RFC 1894)

RFC 3834 – Recommendations for Automatic Responses to Electronic Mail

RFC 4409 – Message Submission for Mail (obsoletes RFC 2476)

RFC 4952 – Overview and Framework for Internationalized E-mail

RFC 4954 – SMTP Service Extension for Authentication (obsoletes RFC 2554)

RFC 5068 – E-mail Submission Operations: Access and Accountability Requirements (BCP 134)

RFC 5321 – The Simple Mail Transfer Protocol (obsoletes RFC 821 aka STD 10, RFC 974, RFC 1869, RFC 2821)

RFC 5322 – Internet Message Format (obsoletes RFC 822 aka STD 11, and RFC 2822)

RFC 5336 - SMTP Extension for Internationalized Email Addresses (updates RFC 2821, RFC 2822, and RFC 4952)

RFC 5504 - Downgrading Mechanism for Email Address Internationalization