| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2142 | Mailbox Names for Common Services, Roles and FunctionsD. Crocker | Proposed Standard | May 1997 |
| 2308 | Negative Caching of DNS Queries (DNS NCACHE)M. Andrews | Proposed Standard | March 1998 |
| 3464 | An Extensible Message Format for Delivery Status NotificationsK. Moore, G. Vaudreuil | Draft Standard | January 2003 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4343 | Domain Name System (DNS) Case Insensitivity ClarificationD. Eastlake 3rd | Proposed Standard | January 2006 |
| 4870 | Domain-Based Email Authentication Using Public Keys Advertised in the DNS (DomainKeys)M. Delany · obsoleted by RFC 4871 | Historic | May 2007 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5322 | Internet Message FormatP. Resnick, Ed. | Draft Standard | October 2008 |
| 5598 | Internet Mail ArchitectureD. Crocker | Informational | July 2009 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 6376 | DomainKeys Identified Mail (DKIM) SignaturesD. Crocker, Ed., T. Hansen, Ed., M. Kucherawy, Ed. | Internet Standard | September 2011 |
| 6377 | DomainKeys Identified Mail (DKIM) and Mailing ListsM. Kucherawy | Best Current Practice | September 2011 |
| 6591 | Authentication Failure Reporting Using the Abuse Reporting FormatH. Fontana | Proposed Standard | April 2012 |
| 6651 | Extensions to DomainKeys Identified Mail (DKIM) for Failure ReportingM. Kucherawy | Proposed Standard | June 2012 |
| 6652 | Sender Policy Framework (SPF) Authentication Failure Reporting Using the Abuse Reporting FormatS. Kitterman | Proposed Standard | June 2012 |
| 7208 | Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1S. Kitterman | Proposed Standard | April 2014 |
| 7405 | Case-Sensitive String Support in ABNFP. Kyzivat | Proposed Standard | December 2014 |
| 7489 | Domain-based Message Authentication, Reporting, and Conformance (DMARC)M. Kucherawy, Ed., E. Zwicky, Ed. · obsoleted by RFC 9989, RFC 9990, RFC 9991 | Informational | March 2015 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 7858 | Specification for DNS over Transport Layer Security (TLS)Z. Hu, L. Zhu, J. Heidemann, A. Mankin, D. Wessels, P. Hoffman | Proposed Standard | May 2016 |
| 7960 | Interoperability Issues between Domain-based Message Authentication, Reporting, and Conformance (DMARC) and Indirect Email FlowsF. Martin, Ed., E. Lear, Ed., T. Draegen, Ed., E. Zwicky, Ed., K. Andersen, Ed. | Informational | September 2016 |
| 8020 | NXDOMAIN: There Really Is Nothing UnderneathS. Bortzmeyer, S. Huque | Proposed Standard | November 2016 |
| 8126 | Guidelines for Writing an IANA Considerations Section in RFCsM. Cotton, B. Leiba, T. Narten | Best Current Practice | June 2017 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8484 | DNS Queries over HTTPS (DoH)P. Hoffman, P. McManus | Proposed Standard | October 2018 |
| 8551 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message SpecificationJ. Schaad, B. Ramsdell, S. Turner | Proposed Standard | April 2019 |
| 8552 | Scoped Interpretation of DNS Resource Records through "Underscored" Naming of Attribute LeavesD. Crocker | Best Current Practice | March 2019 |
| 8601 | Message Header Field for Indicating Message Authentication StatusM. Kucherawy | Proposed Standard | May 2019 |
| 8617 | The Authenticated Received Chain (ARC) ProtocolK. Andersen, B. Long, Ed., S. Blank, Ed., M. Kucherawy, Ed. | Experimental | July 2019 |
| 9091 | Experimental Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Extension for Public Suffix DomainsS. Kitterman, T. Wicinski, Ed. · obsoleted by RFC 9989 | Experimental | July 2021 |
| 9364 | DNS Security Extensions (DNSSEC)P. Hoffman | Best Current Practice | February 2023 |
| 9990 | Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Aggregate ReportingA. Brotman, Ed. | Proposed Standard | May 2026 |
| 9991 | Domain-Based Message Authentication, Reporting, and Conformance (DMARC) Failure ReportingS. Jones, Ed., A. Vesely, Ed. | Proposed Standard | May 2026 |