| 9036 | Changing the Location-to-Service Translation (LoST) Location Profiles Registry PolicyR. Gellens | Proposed Standard | June 2021 |
| 8917 | The LoST-Validation Straightforward-Naming Authority PoinTeR (S-NAPTR) Application Service TagR. Gellens, B. Rosen | Proposed Standard | October 2020 |
| 8876 | Non-interactive Emergency CallsB. Rosen, H. Schulzrinne, H. Tschofenig, R. Gellens | Proposed Standard | September 2020 |
| 8373 | Negotiating Human Language in Real-Time CommunicationsR. Gellens | Proposed Standard | May 2018 |
| 8148 | Next-Generation Vehicle-Initiated Emergency CallsR. Gellens, B. Rosen, H. Tschofenig | Proposed Standard | May 2017 |
| 8147 | Next-Generation Pan-European eCallR. Gellens, H. Tschofenig | Proposed Standard | May 2017 |
| 7852 | Additional Data Related to an Emergency CallR. Gellens, B. Rosen, H. Tschofenig, R. Marshall, J. Winterbottom | Proposed Standard | July 2016 |
| 6856 | Post Office Protocol Version 3 (POP3) Support for UTF-8R. Gellens, C. Newman, J. Yao, K. Fujiwara | Proposed Standard | March 2013 |
| 6783 | Mailing Lists and Non-ASCII AddressesJ. Levine, R. Gellens | Informational | November 2012 |
| 6409 | Message Submission for MailR. Gellens, J. Klensin | Internet Standard | November 2011 |
| 6381 | The 'Codecs' and 'Profiles' Parameters for "Bucket" Media TypesR. Gellens, D. Singer, P. Frojdh | Proposed Standard | August 2011 |
| 5983 | Mailing Lists and Internationalized Email AddressesR. Gellens · obsoleted by RFC 6783 | Experimental | October 2010 |
| 5721 | POP3 Support for UTF-8R. Gellens, C. Newman · obsoleted by RFC 6856 | Experimental | February 2010 |
| 5551 | Lemonade Notifications ArchitectureR. Gellens, Ed. | Informational | August 2009 |
| 5423 | Internet Message Store EventsR. Gellens, C. Newman | Proposed Standard | March 2009 |
| 5383 | Deployment Considerations for Lemonade-Compliant Mobile EmailR. Gellens | Best Current Practice | October 2008 |
| 5257 | Internet Message Access Protocol - ANNOTATE ExtensionC. Daboo, R. Gellens | Experimental | June 2008 |
| 4409 | Message Submission for MailR. Gellens, J. Klensin · obsoleted by RFC 6409 | Draft Standard | April 2006 |
| 4356 | Mapping Between the Multimedia Messaging Service (MMS) and Internet MailR. Gellens | Proposed Standard | January 2006 |
| 4281 | The Codecs Parameter for "Bucket" Media TypesR. Gellens, D. Singer, P. Frojdh · obsoleted by RFC 6381 | Proposed Standard | December 2005 |
| 4146 | Simple New Mail NotificationR. Gellens | Informational | August 2005 |
| 3676 | The Text/Plain Format and DelSp ParametersR. Gellens | Proposed Standard | February 2004 |
| 3625 | The QCP File Format and Media Types for Speech DataR. Gellens, H. Garudadri | Informational | October 2003 |
| 3206 | The SYS and AUTH POP Response CodesR. Gellens | Proposed Standard | February 2002 |
| 2646 | The Text/Plain Format ParameterR. Gellens, Ed. · obsoleted by RFC 3676 | Proposed Standard | August 1999 |
| 2645 | ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP AddressesR. Gellens | Proposed Standard | August 1999 |
| 2636 | Wireless Device Configuration (OTASP/OTAPA) via ACAPR. Gellens | Informational | July 1999 |
| 2604 | Wireless Device Configuration (OTASP/OTAPA) via ACAPR. Gellens · obsoleted by RFC 2636 | Informational | June 1999 |
| 2476 | Message SubmissionR. Gellens, J. Klensin · obsoleted by RFC 4409 | Proposed Standard | December 1998 |
| 2449 | POP3 Extension MechanismR. Gellens, C. Newman, L. Lundblade | Proposed Standard | November 1998 |
| 2384 | POP URL SchemeR. Gellens | Proposed Standard | August 1998 |
| 2066 | TELNET CHARSET OptionR. Gellens | Experimental | January 1997 |