Network Working Group G. Klyne Internet-Draft Nine by Nine Expires: August 17, 2004 J. Palme Stockholm University/KTH February 17, 2004 Registration of mail header fields draft-klyne-hdrreg-mail-02 Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http:// www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 17, 2004. Copyright Notice Copyright (C) The Internet Society (2004). All Rights Reserved. Abstract This document defines the initial IANA registration for permanent mail message header fields, per RFC XXXX [1]. Discussion of this document Please send comments to . To subscribe to this list, send a message with the body 'subscribe' to . Klyne & Palme Expires August 17, 2004 [Page 1] Internet-Draft Mail header registration February 2004 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 Structure of this document . . . . . . . . . . . . . . . . 4 1.2 Document terminology and conventions . . . . . . . . . . . 4 2. Registration templates . . . . . . . . . . . . . . . . . . 4 2.1 Permanent header registrations . . . . . . . . . . . . . . 4 2.1.1 Date: header . . . . . . . . . . . . . . . . . . . . . . . 7 2.1.2 From: header . . . . . . . . . . . . . . . . . . . . . . . 7 2.1.3 Sender: header . . . . . . . . . . . . . . . . . . . . . . 8 2.1.4 Reply-To: header . . . . . . . . . . . . . . . . . . . . . 8 2.1.5 To: header . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.6 Cc: header . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.7 Bcc: header . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.8 Message-ID: header . . . . . . . . . . . . . . . . . . . . 10 2.1.9 In-Reply-To: header . . . . . . . . . . . . . . . . . . . 11 2.1.10 References: header . . . . . . . . . . . . . . . . . . . . 12 2.1.11 Subject: header . . . . . . . . . . . . . . . . . . . . . 12 2.1.12 Comments: header . . . . . . . . . . . . . . . . . . . . . 13 2.1.13 Keywords: header . . . . . . . . . . . . . . . . . . . . . 13 2.1.14 Resent-Date: header . . . . . . . . . . . . . . . . . . . 14 2.1.15 Resent-From: header . . . . . . . . . . . . . . . . . . . 14 2.1.16 Resent-Sender: header . . . . . . . . . . . . . . . . . . 15 2.1.17 Resent-To: header . . . . . . . . . . . . . . . . . . . . 15 2.1.18 Resent-Cc: header . . . . . . . . . . . . . . . . . . . . 16 2.1.19 Resent-Bcc: header . . . . . . . . . . . . . . . . . . . . 16 2.1.20 Resent-Message-ID: header . . . . . . . . . . . . . . . . 17 2.1.21 Return-Path: header . . . . . . . . . . . . . . . . . . . 17 2.1.22 Received: header . . . . . . . . . . . . . . . . . . . . . 18 2.1.23 Content-features: header . . . . . . . . . . . . . . . . . 19 2.1.24 Content-Disposition: header . . . . . . . . . . . . . . . 19 2.1.25 Disclose-Recipients: header . . . . . . . . . . . . . . . 20 2.1.26 Originator: header . . . . . . . . . . . . . . . . . . . . 20 2.1.27 PICS-Label: header . . . . . . . . . . . . . . . . . . . . 21 2.1.28 Content-Language: header . . . . . . . . . . . . . . . . . 21 2.1.29 Content-Alternative: header . . . . . . . . . . . . . . . 22 2.1.30 Encoding: header . . . . . . . . . . . . . . . . . . . . . 23 2.1.31 Content-MD5: header . . . . . . . . . . . . . . . . . . . 23 2.1.32 List-Archive: header . . . . . . . . . . . . . . . . . . . 24 2.1.33 List-Help: header . . . . . . . . . . . . . . . . . . . . 24 2.1.34 List-ID: header . . . . . . . . . . . . . . . . . . . . . 25 2.1.35 List-Owner: header . . . . . . . . . . . . . . . . . . . . 25 2.1.36 List-Post: header . . . . . . . . . . . . . . . . . . . . 26 2.1.37 List-Subscribe: header . . . . . . . . . . . . . . . . . . 27 2.1.38 List-Unsubscribe: header . . . . . . . . . . . . . . . . . 27 2.1.39 MIME-Version: header . . . . . . . . . . . . . . . . . . . 28 2.1.40 Content-ID: header . . . . . . . . . . . . . . . . . . . . 28 2.1.41 Content-Description: header . . . . . . . . . . . . . . . 29 Klyne & Palme Expires August 17, 2004 [Page 2] Internet-Draft Mail header registration February 2004 2.1.42 Content-Transfer-Encoding: header . . . . . . . . . . . . 29 2.1.43 Content-Type: header . . . . . . . . . . . . . . . . . . . 30 2.1.44 Disposition-Notification-To: header . . . . . . . . . . . 31 2.1.45 Disposition-Notification-Options: header . . . . . . . . . 31 2.1.46 Original-Recipient: header . . . . . . . . . . . . . . . . 32 2.1.47 Content-Base: header . . . . . . . . . . . . . . . . . . . 32 2.1.48 Content-Location: header . . . . . . . . . . . . . . . . . 33 2.1.49 DL-Expansion-History: header . . . . . . . . . . . . . . . 33 2.1.50 Alternate-Recipient: header . . . . . . . . . . . . . . . 34 2.1.51 Original-Encoded-Information-Types: header . . . . . . . . 34 2.1.52 Content-Return: header . . . . . . . . . . . . . . . . . . 35 2.1.53 X400-Content-Return: header . . . . . . . . . . . . . . . 35 2.1.54 Generate-Delivery-Report: header . . . . . . . . . . . . . 36 2.1.55 Prevent-NonDelivery-Report: header . . . . . . . . . . . . 37 2.1.56 Obsoletes: header . . . . . . . . . . . . . . . . . . . . 37 2.1.57 Content-Identifier: header . . . . . . . . . . . . . . . . 38 2.1.58 Delivery-Date: header . . . . . . . . . . . . . . . . . . 38 2.1.59 Expiry-Date: header . . . . . . . . . . . . . . . . . . . 39 2.1.60 Reply-By: header . . . . . . . . . . . . . . . . . . . . . 39 2.1.61 Importance: header . . . . . . . . . . . . . . . . . . . . 40 2.1.62 Incomplete-Copy: header . . . . . . . . . . . . . . . . . 41 2.1.63 Priority: header . . . . . . . . . . . . . . . . . . . . . 41 2.1.64 Sensitivity: header . . . . . . . . . . . . . . . . . . . 42 2.1.65 Language: header . . . . . . . . . . . . . . . . . . . . . 42 2.1.66 Conversion: header . . . . . . . . . . . . . . . . . . . . 43 2.1.67 Conversion-With-Loss: header . . . . . . . . . . . . . . . 43 2.1.68 Message-Type: header . . . . . . . . . . . . . . . . . . . 44 2.1.69 Autoforwarded: header . . . . . . . . . . . . . . . . . . 45 2.1.70 Discarded-X400-IPMS-Extensions: header . . . . . . . . . . 45 2.1.71 Discarded-X400-MTS-Extensions: header . . . . . . . . . . 46 3. IANA considerations . . . . . . . . . . . . . . . . . . . 46 4. Security considerations . . . . . . . . . . . . . . . . . 46 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . 46 References . . . . . . . . . . . . . . . . . . . . . . . . 47 Authors' Addresses . . . . . . . . . . . . . . . . . . . . 48 A. Revision history . . . . . . . . . . . . . . . . . . . . . 49 A.1 draft-klyne-hdrreg-mail-02 . . . . . . . . . . . . . . . . 49 A.2 draft-klyne-hdrreg-mail-01 . . . . . . . . . . . . . . . . 49 A.3 draft-klyne-hdrreg-mail-00 . . . . . . . . . . . . . . . . 49 B. TODO: . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Intellectual Property and Copyright Statements . . . . . . 51 Klyne & Palme Expires August 17, 2004 [Page 3] Internet-Draft Mail header registration February 2004 1. Introduction This document defines IANA registration for a number of mail message header fields, per Registration procedures for message header fields [1]. [[[The main body of this document is automatically generated. Some sample HTML registry pages have been prepared from the same data, and can be found at [21].]]] 1.1 Structure of this document Section Section 2 contains the submission for initial registration of mail related message headers fields. 1.2 Document terminology and conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [10]. NOTE: indented comments like this provide additional nonessential information about the rationale behind this document. [[[Editorial comments and questions about outstanding issues are provided in triple brackets like this. These working comments should be resolved and removed prior to final publication.]]] 2. Registration templates Header registry entries are summarized in tabular form for convenience of reference, and presented in full in the following sections. 2.1 Permanent header registrations Header name Protocol ----------- -------- Date mail Message date and time From mail Mailbox of message author Sender mail Mailbox of message sender Reply-To mail Mailbox for replies to message To mail Primary recipient mailbox Cc mail Carbon-copy recipient mailbox Bcc mail Blind-carbon-copy recipient mailbox Message-ID mail Message identifier Klyne & Palme Expires August 17, 2004 [Page 4] Internet-Draft Mail header registration February 2004 In-Reply-To mail Original message identifier(s) References mail Related message identifier(s) Subject mail Topic of message Comments mail Additional comments about the message Keywords mail Message key words and/or phrases Resent-Date mail Date and time message is resent Resent-From mail Mailbox of person for whom message is resent Resent-Sender mail Mailbox of person who actually resends the message Resent-To mail Mailbox to which message is resent Resent-Cc mail Mailbox(es) to which message is cc'ed on resend Resent-Bcc mail Mailbox(es) to which message is bcc'ed on resend Resent-Message-ID mail Message identifier for resent message Return-Path mail Message return path Received mail Mail transfer trace information Content-features mail Indicates content features of a MIME body part Content-Disposition mail Intended content disposition and file name Disclose-Recipients mail Disclose names of other recipients? Originator mail Similar to 'Sender:' PICS-Label mail PICS rating label Content-Language mail Language of message content Content-Alternative mail Alternative content available Encoding mail Message encoding and other information Content-MD5 mail MD5 checksum of content List-Archive mail URL of mailing list archive List-Help mail URL for mailing list information List-ID mail Mailing list identifier List-Owner mail URL for mailing list owner's mailbox List-Post mail URL for mailing list posting List-Subscribe mail URL for mailing list subscription List-Unsubscribe mail URL for mailing list unsubscription MIME-Version mail MIME version number Content-ID mail Identify content body part Content-Description mail Description of message body part Content-Transfer-Encoding mail Content transfer encoding applied Content-Type mail MIME content type Klyne & Palme Expires August 17, 2004 [Page 5] Internet-Draft Mail header registration February 2004 Disposition-Notification-To mail Mailbox for sending disposition notification Disposition-Notification-Options mail Disposition notification options Original-Recipient mail MDN original recipient information Content-Base mail Base to be used for resolving relative URIs within this content part. Content-Location mail URI for retrieving a body part DL-Expansion-History mail Trace of distribution lists passed Alternate-Recipient mail Controls forwarding to alternate recipients Original-Encoded-Information-Types mail Body part types in message Content-Return mail Return content on non-delivery? X400-Content-Return mail Possible future name for 'Content-Return:' Generate-Delivery-Report mail Request delivery report generation Prevent-NonDelivery-Report mail Non-delivery report required? Obsoletes mail Reference message to be replaced Content-Identifier mail Message content identifier Delivery-Date mail Message delivery time Expiry-Date mail Message expiry time Reply-By mail Time by which a reply is requested Importance mail Message importance Incomplete-Copy mail Body parts are missing. Priority mail Message priority Sensitivity mail Message content sensitivity Language mail X.400 message content lenguage Conversion mail Conversion allowed? Conversion-With-Loss mail Lossy conversion allowed? Message-Type mail Message type: delivery report? Autoforwarded mail Automatically forwarded indicator Discarded-X400-IPMS-Extensions mail X.400 IPM extensions discarded Discarded-X400-MTS-Extensions mail X.400 MTS extensions discarded Figure 1: MailHeaderPermanentRegistry.xml Klyne & Palme Expires August 17, 2004 [Page 6] Internet-Draft Mail header registration February 2004 2.1.1 Date: header Header name: Date Description: Message date and time Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.1) Related information: Specifies the date and time at which the creator of the message indicated that the message was complete and ready to enter the mail delivery system. 2.1.2 From: header Header name: From Description: Mailbox of message author Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.2) Klyne & Palme Expires August 17, 2004 [Page 7] Internet-Draft Mail header registration February 2004 Related information: Specifies the author(s) of the message, that is, the mailbox(es) of the person(s) or system(s) responsible for the writing of the message. 2.1.3 Sender: header Header name: Sender Description: Mailbox of message sender Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.2) Related information: Specifies the mailbox of the agent responsible for the actual transmission of the message. 2.1.4 Reply-To: header Header name: Reply-To Description: Mailbox for replies to message Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 8] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.2) Related information: When the R"eply-To: "field is present, it indicates the mailbox(es) to which the author of the message suggests that replies be sent. 2.1.5 To: header Header name: To Description: Primary recipient mailbox Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.3) Related information: Contains the address(es) of the primary recipient(s) of the message. 2.1.6 Cc: header Header name: Cc Description: Carbon-copy recipient mailbox Klyne & Palme Expires August 17, 2004 [Page 9] Internet-Draft Mail header registration February 2004 Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.3) Related information: Bontains the addresses of others who are to receive the message, though the content of the message may not be directed at them. 2.1.7 Bcc: header Header name: Bcc Description: Blind-carbon-copy recipient mailbox Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.3) Related information: Contains addresses of recipients of the message whose addresses are not to be revealed to other recipients of the message. 2.1.8 Message-ID: header Klyne & Palme Expires August 17, 2004 [Page 10] Internet-Draft Mail header registration February 2004 Header name: Message-ID Description: Message identifier Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.4) Related information: Contains a single unique message identifier that refers to a particular version of a particular message. 2.1.9 In-Reply-To: header Header name: In-Reply-To Description: Original message identifier(s) Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.4) Related information: The message identifier(s) of the original message(s) to which the current message is a reply. Klyne & Palme Expires August 17, 2004 [Page 11] Internet-Draft Mail header registration February 2004 2.1.10 References: header Header name: References Description: Related message identifier(s) Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.4) Related information: The message identifier(s) of other message(s) to which the current message may be related. 2.1.11 Subject: header Header name: Subject Description: Topic of message Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.5) Klyne & Palme Expires August 17, 2004 [Page 12] Internet-Draft Mail header registration February 2004 Related information: Contains a short string identifying the topic of the message. 2.1.12 Comments: header Header name: Comments Description: Additional comments about the message Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.5) Related information: Contains any additional comments on the text of the body of the message. 2.1.13 Keywords: header Header name: Keywords Description: Message key words and/or phrases Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Klyne & Palme Expires August 17, 2004 [Page 13] Internet-Draft Mail header registration February 2004 Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.5) Related information: Contains a comma-separated list of important words and phrases that might be useful for the recipient. 2.1.14 Resent-Date: header Header name: Resent-Date Description: Date and time message is resent Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Contains the date and time that a message is reintroduced into the message transfer system. 2.1.15 Resent-From: header Header name: Resent-From Description: Mailbox of person for whom message is resent Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 14] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Contains the mailbox of the agent who has reintroduced the message into the message transfer system, or on whose behanlf the message has been resent. 2.1.16 Resent-Sender: header Header name: Resent-Sender Description: Mailbox of person who actually resends the message Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Contains the mailbox of the agent who has reintroduced the message into the message transfer system, if this is different from the Resent-from value. 2.1.17 Resent-To: header Header name: Resent-To Description: Mailbox to which message is resent Klyne & Palme Expires August 17, 2004 [Page 15] Internet-Draft Mail header registration February 2004 Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Contains the mailbox(es) to which the message has been resent. 2.1.18 Resent-Cc: header Header name: Resent-Cc Description: Mailbox(es) to which message is cc'ed on resend Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Containes the mailbox(es) to which message is cc'ed on resend 2.1.19 Resent-Bcc: header Header name: Resent-Bcc Klyne & Palme Expires August 17, 2004 [Page 16] Internet-Draft Mail header registration February 2004 Description: Mailbox(es) to which message is bcc'ed on resend Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Containes the mailbox(es) to which message is bcc'ed on resend 2.1.20 Resent-Message-ID: header Header name: Resent-Message-ID Description: Message identifier for resent message Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.6) Related information: Contains a message identifier for a resent message 2.1.21 Return-Path: header Klyne & Palme Expires August 17, 2004 [Page 17] Internet-Draft Mail header registration February 2004 Header name: Return-Path Description: Message return path Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.7) Related information: Return path for message response diagnostics. See also, RFC 2821. 2.1.22 Received: header Header name: Received Description: Mail transfer trace information Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt (section 3.6.7) Related information: Contains information about receipt of the current message by a mail transfer agent on the transfer path. See also, RFC 2821. Klyne & Palme Expires August 17, 2004 [Page 18] Internet-Draft Mail header registration February 2004 2.1.23 Content-features: header Header name: Content-features Description: Indicates content features of a MIME body part Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2912.txt (section 3) Related information: The 'Content-features:' header can be used to annotate a MIME body part with a media feature expression, to indicate features of the body part content. See also: RFC 2533, RFC 2506, RFC 2045. 2.1.24 Content-Disposition: header Header name: Content-Disposition Description: Intended content disposition and file name Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: experimental Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2183.txt Klyne & Palme Expires August 17, 2004 [Page 19] Internet-Draft Mail header registration February 2004 Related information: Whether a MIME body part is to be shown inline or is an attachment; can also indicate a suggested filename for use when saving an attachment to a file. 2.1.25 Disclose-Recipients: header Header name: Disclose-Recipients Description: Disclose names of other recipients? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Tells whether recipients are to be told the names of other recipients of the same message. This is primarily an X.400 facility. In X.400, this is an envelope attribute and refers to disclosure of the envelope recipient list. Disclosure of other recipients is in Internet mail done via the To:, cc: and bcc: header fields. Not for general use. 2.1.26 Originator: header Header name: Originator Description: Similar to 'Sender:' Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Klyne & Palme Expires August 17, 2004 [Page 20] Internet-Draft Mail header registration February 2004 Status: experimental Author/change controller: Carl Malamud (mailto:carl@malamud.com) Internet Multicasting Service. Specification document(s): http://www.rfc-editor.org/rfc/rfc1528.txt Related information: Sometimes used in Usenet News in similar ways to 'Sender:' Also used in printing protocols. Non-standard in Usenet News, Experimental in RFC 1528 (tcp.int). 2.1.27 PICS-Label: header Header name: PICS-Label Description: PICS rating label Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standard Author/change controller: W3C (mailto:web-human@w3.org) World Wide Web Consortium. Specification document(s): http://www.w3.org/TR/REC-PICS-labels Related information: Ratings label to control selection (filtering) of messages according to the PICS protocol. Specified for general use with RFC822 message format, with HTTP-specific extensions 2.1.28 Content-Language: header Header name: Content-Language Klyne & Palme Expires August 17, 2004 [Page 21] Internet-Draft Mail header registration February 2004 Description: Language of message content Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc1766.txt Related information: Can include a code for the natural language used in a message, e.g. 'en' for English. 2.1.29 Content-Alternative: header Header name: Content-Alternative Description: Alternative content available Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: work-in-progress Author/change controller: Graham Klyne (mailto:GK-headers@ninebynine.org) Clearswift Corporation, 1310 Waterside, Arlington Business Park, Theale, Reading, RG7 4SA, UK. Tel: 011 8903 8903 Fax: 011 8903 9000 URL: http://www.mimesweeper.com/ Specification document(s): http://www.ietf.org/internet-drafts/ draft-ietf-fax-content-negotiation-05.txt Klyne & Palme Expires August 17, 2004 [Page 22] Internet-Draft Mail header registration February 2004 Related information: Information about the media features of alternative content formats available for the current message. 2.1.30 Encoding: header Header name: Encoding Description: Message encoding and other information Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: experimental Author/change controller: Albert K. Costanzo (mailto:AL@AKC.COM) AKC Consulting Inc.. Specification document(s): http://www.rfc-editor.org/rfc/rfc1505.txt Related information: Used in several different ways by different mail systems. Some use it for a kind of content-type information, some for encoding and length information, some for a kind of boundary information, some in other ways. 2.1.31 Content-MD5: header Header name: Content-MD5 Description: MD5 checksum of content Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 23] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc1864.txt Related information: Checksum of content to ensure that it has not been modified. 2.1.32 List-Archive: header Header name: List-Archive Description: URL of mailing list archive Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Related information: Contains URL to use to browse the archives of the mailing list from which this message was relayed. 2.1.33 List-Help: header Header name: List-Help Description: URL for mailing list information Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Klyne & Palme Expires August 17, 2004 [Page 24] Internet-Draft Mail header registration February 2004 Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Related information: Contains URL to use to get a information about the mailing list from which this message was relayed. 2.1.34 List-ID: header Header name: List-ID Description: Mailing list identifier Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc1919.txt Related information: Stores an identification of the mailing list, through which this message was distributed. 2.1.35 List-Owner: header Header name: List-Owner Klyne & Palme Expires August 17, 2004 [Page 25] Internet-Draft Mail header registration February 2004 Description: URL for mailing list owner's mailbox Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Related information: Contains URL to send e-mail to the owner of the mailing list from which this message was relayed. 2.1.36 List-Post: header Header name: List-Post Description: URL for mailing list posting Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Related information: Contains URL to use to send contributions to the mailing list from which this message was relayed. Klyne & Palme Expires August 17, 2004 [Page 26] Internet-Draft Mail header registration February 2004 2.1.37 List-Subscribe: header Header name: List-Subscribe Description: URL for mailing list subscription Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Related information: Contains URL to use to get a subscription to the mailing list from which this message was relayed. 2.1.38 List-Unsubscribe: header Header name: List-Unsubscribe Description: URL for mailing list unsubscription Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2369.txt Klyne & Palme Expires August 17, 2004 [Page 27] Internet-Draft Mail header registration February 2004 Related information: Contains URL to use to unsubscribe the mailing list from which this message was relayed. 2.1.39 MIME-Version: header Header name: MIME-Version Description: MIME version number Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2045.txt (section 4) Related information: An indicator that this message is formatted according to the MIME standard, and an indication of which version of MIME is utilized. 2.1.40 Content-ID: header Header name: Content-ID Description: Identify content body part Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Klyne & Palme Expires August 17, 2004 [Page 28] Internet-Draft Mail header registration February 2004 Specification document(s): http://www.rfc-editor.org/rfc/rfc2045.txt (section 7) Related information: Specifies a Unique ID for one MIME body part of the content of a message. 2.1.41 Content-Description: header Header name: Content-Description Description: Description of message body part Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2045.txt (section 8) Related information: Description of a particular body part of a message, for example a caption for an image body part. 2.1.42 Content-Transfer-Encoding: header Header name: Content-Transfer-Encoding Description: Content transfer encoding applied Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 29] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2045.txt (section 6) Related information: Coding method used in a MIME message body part. 2.1.43 Content-Type: header Header name: Content-Type Description: MIME content type Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2045.txt (section 5) Related information: Format of content (character set etc.) Note that the values for this header field are defined in different ways in RFC 1049 and in MIME (RFC 2045), look for the 'MIME-version' header field to understand if Content-Type is to be interpreted according to RFC 1049 or according to MIME. The MIME definition should be used in generating mail. RFC 1049 has 'historic' status. RFC 1766 defines a parameter 'difference' to this header field. Various other Content-Type define various additional parameters. For example, the parameter 'charset' is mandatory for all textual Content-Types. See also: RFC 1049, RFC 1123: 5.2.13, RFC 1766: 4.1. Klyne & Palme Expires August 17, 2004 [Page 30] Internet-Draft Mail header registration February 2004 2.1.44 Disposition-Notification-To: header Header name: Disposition-Notification-To Description: Mailbox for sending disposition notification Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2298.txt Related information: Indicates that the sender wants a disposition notification when this message is received (read, processed, etc.) by its recipients. 2.1.45 Disposition-Notification-Options: header Header name: Disposition-Notification-Options Description: Disposition notification options Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2298.txt Klyne & Palme Expires August 17, 2004 [Page 31] Internet-Draft Mail header registration February 2004 Related information: For optional modifiers on disposition notification requests. 2.1.46 Original-Recipient: header Header name: Original-Recipient Description: MDN original recipient information Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2298.txt Related information: Original Recipient information for inclusion in disposition notifications. 2.1.47 Content-Base: header Header name: Content-Base Description: Base to be used for resolving relative URIs within this content part. Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Klyne & Palme Expires August 17, 2004 [Page 32] Internet-Draft Mail header registration February 2004 Specification document(s): http://www.rfc-editor.org/rfc/rfc2110.txt Related information: Base to be used for resolving relative URIs within this content part. 2.1.48 Content-Location: header Header name: Content-Location Description: URI for retrieving a body part Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2110.txt Related information: URI with which the content of this content part might be retrievable. 2.1.49 DL-Expansion-History: header Header name: DL-Expansion-History Description: Trace of distribution lists passed Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 33] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Trace of distribution lists passed. (MIXER X.400 mapping, not for general use.) 2.1.50 Alternate-Recipient: header Header name: Alternate-Recipient Description: Controls forwarding to alternate recipients Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Controls whether this message may be forwarded to alternate recipients such as a postmaster if delivery is not possible to the intended recipient. Default: Allowed. RFC 2156 (MIXER), not for general usage. 2.1.51 Original-Encoded-Information-Types: header Header name: Original-Encoded-Information-Types Description: Body part types in message Klyne & Palme Expires August 17, 2004 [Page 34] Internet-Draft Mail header registration February 2004 Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Which body part types occur in this message. RFC 2156 (MIXER), not for general use. 2.1.52 Content-Return: header Header name: Content-Return Description: Return content on non-delivery? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Indicates whether the content of a message is to be returned with non-delivery notifications. RFC 2156 (MIXER), not for general use. 2.1.53 X400-Content-Return: header Klyne & Palme Expires August 17, 2004 [Page 35] Internet-Draft Mail header registration February 2004 Header name: X400-Content-Return Description: Possible future name for 'Content-Return:' Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: non-standard Author/change controller: Unknown (mailto:xxxx@ietf.org) Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Possible future change of name for 'Content-Return:'. 2.1.54 Generate-Delivery-Report: header Header name: Generate-Delivery-Report Description: Request delivery report generation Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Indicates whether a delivery report is wanted at successful delivery. Default is not to generate such a report. RFC 2156 (MIXER), not for general usage. Klyne & Palme Expires August 17, 2004 [Page 36] Internet-Draft Mail header registration February 2004 2.1.55 Prevent-NonDelivery-Report: header Header name: Prevent-NonDelivery-Report Description: Non-delivery report required? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Indicates whether non-delivery report is wanted on delivery error. Default is to generate such a report. RFC 2156 (MIXER), not for general usage. 2.1.56 Obsoletes: header Header name: Obsoletes Description: Reference message to be replaced Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Klyne & Palme Expires August 17, 2004 [Page 37] Internet-Draft Mail header registration February 2004 Related information: Reference to a previous message being corrected and replaced. Compare to 'Supersedes:'. This field may in the future be replaced with 'Supersedes:'. RFC 2156, not for general use. 2.1.57 Content-Identifier: header Header name: Content-Identifier Description: Message content identifier Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: A text string which identifies the content of a message. RFC 2156, not for general usage. 2.1.58 Delivery-Date: header Header name: Delivery-Date Description: Message delivery time Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Klyne & Palme Expires August 17, 2004 [Page 38] Internet-Draft Mail header registration February 2004 Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: The time when a message was delivered to its recipient. RFC 2156 (MIXER), not for general use. 2.1.59 Expiry-Date: header Header name: Expiry-Date Description: Message expiry time Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Time at which a message loses its validity. This field may in the future be replaced by 'Expires:'. RFC 2156 (MIXER), not for general use. 2.1.60 Reply-By: header Header name: Reply-By Description: Time by which a reply is requested Klyne & Palme Expires August 17, 2004 [Page 39] Internet-Draft Mail header registration February 2004 Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Latest time at which a reply is requested (not demanded). RFC 2156 (MIXER), not for general usage. 2.1.61 Importance: header Header name: Importance Description: Message importance Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: A hint from the originator to the recipients about how important a message is. Values: High, normal or low. Not used to control transmission speed. Proposed for use with RFC 2156 (MIXER) and RFC 2421 (VPIM). Klyne & Palme Expires August 17, 2004 [Page 40] Internet-Draft Mail header registration February 2004 2.1.62 Incomplete-Copy: header Header name: Incomplete-Copy Description: Body parts are missing. Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Body parts are missing. RFC 2156 (MIXER), not for general usage. 2.1.63 Priority: header Header name: Priority Description: Message priority Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Klyne & Palme Expires August 17, 2004 [Page 41] Internet-Draft Mail header registration February 2004 Related information: Can be 'normal', 'urgent' or 'non-urgent' and can influence transmission speed and delivery. RFC 2156 (MIXER), not for general use. 2.1.64 Sensitivity: header Header name: Sensitivity Description: Message content sensitivity Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: How sensitive it is to disclose this message to other people than the specified recipients. Values: Personal, private, company confidential. The absence of this header field in messages gatewayed from X.400 indicates that the message is not sensitive. Proposed for use with RFC 2156 (MIXER) and RFC 2421 (VPIM). 2.1.65 Language: header Header name: Language Description: X.400 message content lenguage Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Klyne & Palme Expires August 17, 2004 [Page 42] Internet-Draft Mail header registration February 2004 Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Can include a code for the natural language used in a message, e.g. 'en' for English. RFC 2156 (MIXER), not for general usage. 2.1.66 Conversion: header Header name: Conversion Description: Conversion allowed? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: The body of this message may not be converted from one character set to another. Values: Prohibited and allowed. RFC 2156 (MIXER), not for general use. 2.1.67 Conversion-With-Loss: header Header name: Conversion-With-Loss Klyne & Palme Expires August 17, 2004 [Page 43] Internet-Draft Mail header registration February 2004 Description: Lossy conversion allowed? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: The body of this message may not be converted from one character set to another if information will be lost. Values: Prohibited and allowed. RFC 2156 (MIXER), not for general use. 2.1.68 Message-Type: header Header name: Message-Type Description: Message type: delivery report? Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Only used with the value 'Delivery Report' to indicates that this is a delivery report gatewayed from X.400. RFC 2156 (MIXER), not for general use. Klyne & Palme Expires August 17, 2004 [Page 44] Internet-Draft Mail header registration February 2004 2.1.69 Autoforwarded: header Header name: Autoforwarded Description: Automatically forwarded indicator Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Has been automatically forwarded. RFC 2156 (MIXER), not for general usage. 2.1.70 Discarded-X400-IPMS-Extensions: header Header name: Discarded-X400-IPMS-Extensions Description: X.400 IPM extensions discarded Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Klyne & Palme Expires August 17, 2004 [Page 45] Internet-Draft Mail header registration February 2004 Related information: Can be used in Internet mail to indicate X.400 IPM extensions which could not be mapped to Internet mail format. RFC 2156 (MIXER), not for general usage. 2.1.71 Discarded-X400-MTS-Extensions: header Header name: Discarded-X400-MTS-Extensions Description: X.400 MTS extensions discarded Applicable protocol: mail (http://www.rfc-editor.org/rfc/rfc2822.txt) Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force. Specification document(s): http://www.rfc-editor.org/rfc/rfc2822.txt Related information: Can be used in Internet mail to indicate X.400 MTS extensions which could not be mapped to Internet mail format. RFC 2156 (MIXER), not for general usage. 3. IANA considerations This specification provides an initial registration of mail headers in the "IANA registry for normative message headers", defined by Registration procedures for message headers [1]. 4. Security considerations No security considerations are introduced by this specification beyond those already inherent in the use of message headers. 5. Acknowledgements Most of the information in this document has been derived from Jacob Palme's work in RFC 2076 [8] and subsequent updates [20]. Klyne & Palme Expires August 17, 2004 [Page 46] Internet-Draft Mail header registration February 2004 The author also gratefully acknowledges the contributions of: Mark Nottingham, [[[...]]] References [1] Klyne, G., Nottingham, M. and J. Mogul, "Registration procedures for message headers", Oct 2003, . [2] Alvestrand, H., Jordan, K. and J. Romaguera, "Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages", RFC 1496, August 1993. [3] Costanzo, A., Robinson, D. and R. Ullmann, "Encoding Header Field for Internet Messages", RFC 1505, August 1993. [4] Alvestrand, H., "Tags for the Identification of Languages", RFC 1766, March 1995. [5] Myers, J. and M. Rose, "The Content-MD5 Header Field", RFC 1864, October 1995. [6] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996. [7] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types", RFC 2046, November 1996. [8] Palme, J., "Common Internet Message Headers", RFC 2076, February 1997. [9] Palme, J. and A. Hopmann, "MIME E-mail Encapsulation of Aggregate Documents, such as HTML (MHTML)", RFC 2110, March 1997. [10] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [11] Kille, S., "MIXER (Mime Internet X.400 Enhanced Relay): Mapping between X.400 and RFC 822/MIME", RFC 2156, January 1998. [12] Troost, R., Dorner, S. and K. Moore, "Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field", RFC 2183, August 1997. Klyne & Palme Expires August 17, 2004 [Page 47] Internet-Draft Mail header registration February 2004 [13] Fajman, R., "An Extensible Message Format for Message Disposition Notifications", RFC 2298, March 1998. [14] Neufeld, G. and J. Baer, "The Use of URLs as Meta-Syntax for Core Mail List Commands and their Transport through Message Header Fields", RFC 2369, July 1998. [15] Vaudreuil, G. and G. Parsons, "Voice Profile for Internet Mail - version 2", RFC 2421, September 1998. [16] Klensin, J., "Simple Mail Transfer Protocol", RFC 2821, April 2001. [17] Resnick, P., "Internet Message Format", RFC 2822, April 2001. [18] Klyne, G., "Indicating Media Features for MIME Content", RFC 2912, September 2000. [19] Chandhok, R. and G. Wenger, "List-Id: A Structured Field and Namespace for the Identification of Mailing Lists", RFC 2919, March 2001. [20] Palme, J., "Common Internet Message Header Fields", Internet draft draft-palme-mailext-headers-06, November 2001, . [21] Authors' Addresses Graham Klyne Nine by Nine UK EMail: GK-IETF@ninebynine.org URI: http://www.ninebynine.net/ Klyne & Palme Expires August 17, 2004 [Page 48] Internet-Draft Mail header registration February 2004 Jacob Palme Stockholm University/KTH Forum 100 Kista S-164 40 Sweden Phone: +46-8-16 16 67 EMail: jpalme@dsv.su.se Appendix A. Revision history [[[Please remove this section on final publication]]] A.1 draft-klyne-hdrreg-mail-02 02b 17-Feb-2004: * Removed provisional mail header registrations from this document. 02a 05-Aug-2002: * Added Jacob Palme as co-editor. A.2 draft-klyne-hdrreg-mail-01 01c 05-Jun-2002: * Minor editorial. 01b 10-May-2002: * Updated some contact information. * Regenerated registry tables with revised software. 01a 08-May-2002: * Revised change controller information in line with registry specification. * Cleaned up some table layout. A.3 draft-klyne-hdrreg-mail-00 Klyne & Palme Expires August 17, 2004 [Page 49] Internet-Draft Mail header registration February 2004 00c 05-May-2002: * Added data for permanent and provisional registries. 00b 01-May-2002: * Revised form of registry entry content. (Auto-generated from RDF data.) 00a 22-Jan-2002: * Document initially created. Appendix B. TODO: [[[Please remove this section on final publication]]] o Review source document information for provisional registry entries. o Select appropriate email address for provisional entries with unknown change controller. (Use mailing list for announcing new proposals?) Klyne & Palme Expires August 17, 2004 [Page 50] Internet-Draft Mail header registration February 2004 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat. 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