INTERNET-DRAFT Charles H. Lindsey Usenet Format Working Group University of Manchester April 2001
6. Optional Headers The headers appearing in this section have established meanings and MUST be interpreted according to the definitions given here. None of them is required to appear in every article but some of them are required in certain types of article, such as followups. Any header defined in this (or any other) standard MUST NOT appear more than once in an article unless specifically stated otherwise. Experimental headers (4.2.2.1) and headers defined by cooperating subnets are exempt from this requirement. See section 8 "Duties of Various Agents" for the full picture. 6.1. Reply-To 6.1.1. Examples 6.2. Sender 6.3. Organization 6.4. Keywords 6.5. Summary 6.6. Distribution 6.7. Followup-To 6.8. Mail-Copies-To 6.9. Posted-And-Mailed 6.10. References 6.10.1. Examples 6.11. Expires 6.12. Archive 6.13. Control 6.14. Approved 6.15. Replaces / Supersedes 6.15.1. Syntax and Semantics 6.15.2. Message-ID version procedure 6.15.2.1. Message version numbers 6.15.2.2. Implementation and Use Note 6.15.2.3. The Message-Version NNTP extension 6.15.2.4. Examples 6.16. Xref 6.17. Lines 6.18. User-Agent 6.18.1. Examples 6.19. Injector-Info 6.19.1. Usage of Injector-Info-header-parameters 6.19.1.1. The posting-host-parameter 6.19.1.2. The posting-account-parameter 6.19.1.3. The posting-sender-parameter 6.19.1.4. The posting-logging-parameter 6.19.1.5. The posting-date-parameter 6.19.2. Example 6.20. Complaints-To 6.21. MIME headers 6.21.1. Syntax 6.21.2. Content-Transfer-Encoding 6.21.3. Content-Type 6.21.3.1. Message/partial 6.21.3.2. Message/rfc822 6.21.3.3. Message/external-body 6.21.3.4. Multipart types 6.21.4. Character Sets 6.21.5. Content Disposition 6.21.6. Definition of some new Content-Types 6.21.6.1. Application/news-transmission 6.21.6.2. Message/news withdrawn 6.22. Obsolete Headers[Previous Up to Table of Contents Next]
See also previous draft (03): 6. Optional Headers
See also previous draft (02): 6. Optional Headers
See also previous draft (son-of-1036): 6__Optional_Headers
See also previous draft (rfc-1036): RFC1036_2_2__Optional_Headers