Cited in: RFC 7293
12 RFCs mentioned in the text of RFC 7293 (The Require-Recipient-Valid-Since Header Field and SMTP Service Extension)
| RFC | Title | Status | Date |
|---|---|---|---|
| 2119 | Key words for use in RFCs to Indicate Requirement Levels | Best Current Practice | March 1997 |
| 2142 | Mailbox Names for Common Services, Roles and Functions | Proposed Standard | May 1997 |
| 3339 | Date and Time on the Internet: Timestamps | Proposed Standard | July 2002 |
| 3464 | An Extensible Message Format for Delivery Status Notifications | Draft Standard | January 2003 |
| 3864 | Registration Procedures for Message Header Fields | Best Current Practice | September 2004 |
| 5234 | Augmented BNF for Syntax Specifications: ABNF | Internet Standard | January 2008 |
| 5321 | Simple Mail Transfer Protocol | Draft Standard | October 2008 |
| 5322 | Internet Message Format | Draft Standard | October 2008 |
| 5598 | Internet Mail Architecture | Informational | July 2009 |
| 5741 | RFC Streams, Headers, and Boilerplates | Informational | December 2009 |
| 5905 | Network Time Protocol Version 4: Protocol and Algorithms Specification | Proposed Standard | June 2010 |
| 7001 | Message Header Field for Indicating Message Authentication Status | Proposed Standard | September 2013 |