| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 1939 | Post Office Protocol - Version 3J. Myers, M. Rose | Internet Standard | May 1996 |
| 2045 | Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message BodiesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 3464 | An Extensible Message Format for Delivery Status NotificationsK. Moore, G. Vaudreuil | Draft Standard | January 2003 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 3552 | Guidelines for Writing RFC Text on Security ConsiderationsE. Rescorla, B. Korver | Best Current Practice | July 2003 |
| 3596 | DNS Extensions to Support IP Version 6S. Thomson, C. Huitema, V. Ksinant, M. Souissi | Internet Standard | October 2003 |
| 3864 | Registration Procedures for Message Header FieldsG. Klyne, M. Nottingham, J. Mogul | Best Current Practice | September 2004 |
| 4406 | Sender ID: Authenticating E-MailJ. Lyon, M. Wong | Historic | April 2006 |
| 4407 | Purported Responsible Address in E-Mail MessagesJ. Lyon | Historic | April 2006 |
| 4408 | Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1M. Wong, W. Schlitt · obsoleted by RFC 7208 | Experimental | April 2006 |
| 4870 | Domain-Based Email Authentication Using Public Keys Advertised in the DNS (DomainKeys)M. Delany · obsoleted by RFC 4871 | Historic | May 2007 |
| 4954 | SMTP Service Extension for AuthenticationR. Siemborski, Ed., A. Melnikov, Ed. | Proposed Standard | July 2007 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |
| 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 |
| 5451 | Message Header Field for Indicating Message Authentication StatusM. Kucherawy · obsoleted by RFC 7001 | Proposed Standard | April 2009 |
| 5518 | Vouch By ReferenceP. Hoffman, J. Levine, A. Hathcock | Proposed Standard | April 2009 |
| 5598 | Internet Mail ArchitectureD. Crocker | Informational | July 2009 |
| 5617 | DomainKeys Identified Mail (DKIM) Author Domain Signing Practices (ADSP)E. Allman, J. Fenton, M. Delany, J. Levine | Historic | August 2009 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 6008 | Authentication-Results Registration for Differentiating among Cryptographic ResultsM. Kucherawy | Proposed Standard | September 2010 |
| 6212 | Authentication-Results Registration for Vouch by Reference ResultsM. Kucherawy | Proposed Standard | April 2011 |
| 6376 | DomainKeys Identified Mail (DKIM) SignaturesD. Crocker, Ed., T. Hansen, Ed., M. Kucherawy, Ed. | Internet Standard | September 2011 |
| 6541 | DomainKeys Identified Mail (DKIM) Authorized Third-Party SignaturesM. Kucherawy | Experimental | February 2012 |
| 6577 | Authentication-Results Registration Update for Sender Policy Framework (SPF) ResultsM. Kucherawy · obsoleted by RFC 7001 | Proposed Standard | March 2012 |
| 7001 | Message Header Field for Indicating Message Authentication StatusM. Kucherawy · obsoleted by RFC 7601 | Proposed Standard | September 2013 |
| 7208 | Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1S. Kitterman | Proposed Standard | April 2014 |
| 7281 | Authentication-Results Registration for S/MIME Signature VerificationA. Melnikov | Informational | June 2014 |
| 7293 | The Require-Recipient-Valid-Since Header Field and SMTP Service ExtensionW. Mills, M. Kucherawy | Proposed Standard | July 2014 |
| 7328 | Writing I-Ds and RFCs Using Pandoc and a Bit of XMLR. Gieben | Informational | August 2014 |
| 7372 | Email Authentication Status CodesM. Kucherawy | Proposed Standard | September 2014 |
| 7410 | A Property Types Registry for the Authentication-Results Header FieldM. Kucherawy · obsoleted by RFC 7601 | 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 |