| 9051 | Internet Message Access Protocol (IMAP) - Version 4rev2A. Melnikov, Ed., B. Leiba, Ed. | Proposed Standard | August 2021 |
| 8823 | Extensions to Automatic Certificate Management Environment for End-User S/MIME CertificatesA. Melnikov | Informational | April 2021 |
| 8621 | The JSON Meta Application Protocol (JMAP) for MailN. Jenkins, C. Newman | Proposed Standard | August 2019 |
| 8580 | Sieve Extension: File Carbon Copy (FCC)K. Murchison, B. Gondwana | Proposed Standard | May 2019 |
| 8187 | Indicating Character Encoding and Language for HTTP Header Field ParametersJ. Reschke | Proposed Standard | September 2017 |
| 7763 | The text/markdown Media TypeS. Leonard | Informational | March 2016 |
| 7578 | Returning Values from Forms: multipart/form-dataL. Masinter | Proposed Standard | July 2015 |
| 7444 | Security Labels in Internet EmailK. Zeilenga, A. Melnikov | Informational | February 2015 |
| 6857 | Post-Delivery Message Downgrading for Internationalized Email MessagesK. Fujiwara | Proposed Standard | March 2013 |
| 6856 | Post Office Protocol Version 3 (POP3) Support for UTF-8R. Gellens, C. Newman, J. Yao, K. Fujiwara | Proposed Standard | March 2013 |
| 6838 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin, T. Hansen | Best Current Practice | January 2013 |
| 6690 | Constrained RESTful Environments (CoRE) Link FormatZ. Shelby | Proposed Standard | August 2012 |
| 6530 | Overview and Framework for Internationalized EmailJ. Klensin, Y. Ko | Proposed Standard | February 2012 |
| 6381 | The 'Codecs' and 'Profiles' Parameters for "Bucket" Media TypesR. Gellens, D. Singer, P. Frojdh | Proposed Standard | August 2011 |
| 6266 | Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)J. Reschke | Proposed Standard | June 2011 |
| 6210 | Experiment: Hash Functions with Parameters in the Cryptographic Message Syntax (CMS) and S/MIMEJ. Schaad | Experimental | April 2011 |
| 5988 | Web LinkingM. Nottingham · obsoleted by RFC 8288 | Proposed Standard | October 2010 |
| 5987 | Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field ParametersJ. Reschke · obsoleted by RFC 8187 | Historic | August 2010 |
| 5825 | Displaying Downgraded Messages for Email Address InternationalizationK. Fujiwara, B. Leiba · obsoleted by RFC 6530 | Experimental | April 2010 |
| 5738 | IMAP Support for UTF-8P. Resnick, C. Newman · obsoleted by RFC 6855 | Experimental | March 2010 |
| 5721 | POP3 Support for UTF-8R. Gellens, C. Newman · obsoleted by RFC 6856 | Experimental | February 2010 |
| 5703 | Sieve Email Filtering: MIME Part Tests, Iteration, Extraction, Replacement, and EnclosureT. Hansen, C. Daboo | Proposed Standard | October 2009 |
| 5646 | Tags for Identifying LanguagesA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2009 |
| 5536 | Netnews Article FormatK. Murchison, Ed., C. Lindsey, D. Kohn | Proposed Standard | November 2009 |
| 5504 | Downgrading Mechanism for Email Address InternationalizationK. Fujiwara, Ed., Y. Yoneya, Ed. · obsoleted by RFC 6530 | Experimental | March 2009 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5293 | Sieve Email Filtering: Editheader ExtensionJ. Degener, P. Guenther | Proposed Standard | August 2008 |
| 5259 | Internet Message Access Protocol - CONVERT ExtensionA. Melnikov, Ed., P. Coates, Ed. | Proposed Standard | July 2008 |
| 5255 | Internet Message Access Protocol InternationalizationC. Newman, A. Gulbrandsen, A. Melnikov | Proposed Standard | June 2008 |
| 4952 | Overview and Framework for Internationalized EmailJ. Klensin, Y. Ko · obsoleted by RFC 6530 | Informational | July 2007 |
| 4646 | Tags for Identifying LanguagesA. Phillips, M. Davis · obsoleted by RFC 5646 | Best Current Practice | September 2006 |
| 4288 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin · obsoleted by RFC 6838 | Best Current Practice | December 2005 |
| 4281 | The Codecs Parameter for "Bucket" Media TypesR. Gellens, D. Singer, P. Frojdh · obsoleted by RFC 6381 | Proposed Standard | December 2005 |
| 4263 | Media Subtype Registration for Media Type text/troffB. Lilly | Informational | January 2006 |
| 4249 | Implementer-Friendly Specification of Message and MIME-Part Header Fields and Field ComponentsB. Lilly | Informational | January 2006 |
| 4096 | Policy-Mandated Labels Such as "Adv:" in Email Subject Headers Considered Ineffective At BestC. Malamud | Informational | May 2005 |
| 3864 | Registration Procedures for Message Header FieldsG. Klyne, M. Nottingham, J. Mogul | Best Current Practice | September 2004 |
| 3834 | Recommendations for Automatic Responses to Electronic MailK. Moore | Proposed Standard | August 2004 |
| 3795 | Survey of IPv4 Addresses in Currently Deployed IETF Application Area Standards Track and Experimental DocumentsR. Sofia, P. Nesser, II | Informational | June 2004 |
| 2440 | OpenPGP Message FormatJ. Callas, L. Donnerhacke, H. Finney, R. Thayer · obsoleted by RFC 4880 | Proposed Standard | November 1998 |
| 2388 | Returning Values from Forms: multipart/form-dataL. Masinter · obsoleted by RFC 7578 | Proposed Standard | August 1998 |