RFC 4021
Registration of Mail and MIME Header Fields
Network Working Group G. Klyne Request for Comments: 4021 University of Oxford Category: Standards Track J. Palme Stockholm University/KT March 2005 Registration of Mail and MIME Header Fields Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2005).Abstract
This document defines the initial IANA registration for permanent mail and MIME message header fields, per RFC 3864.Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Structure of This Document . . . . . . . . . . . . . . . 3 1.2. Document Terminology and Conventions . . . . . . . . . . 4 2. Registration Templates . . . . . . . . . . . . . . . . . . . . 4 2.1. Permanent Mail Header Field Registrations . . . . . . . 4 2.1.1. Header Field: Date . . . . . . . . . . . . . . . 6 2.1.2. Header Field: From . . . . . . . . . . . . . . . 7 2.1.3. Header Field: Sender . . . . . . . . . . . . . . 7 2.1.4. Header Field: Reply-To . . . . . . . . . . . . . 8 2.1.5. Header Field: To . . . . . . . . . . . . . . . . 8 2.1.6. Header Field: Cc . . . . . . . . . . . . . . . . 9 2.1.7. Header Field: Bcc . . . . . . . . . . . . . . . 9 2.1.8. Header Field: Message-ID . . . . . . . . . . . . 10 2.1.9. Header Field: In-Reply-To . . . . . . . . . . . 10 2.1.10. Header Field: References . . . . . . . . . . . . 11 2.1.11. Header Field: Subject . . . . . . . . . . . . . 11 2.1.12. Header Field: Comments . . . . . . . . . . . . . 12 2.1.13. Header Field: Keywords . . . . . . . . . . . . . 12 2.1.14. Header Field: Resent-Date . . . . . . . . . . . 13 2.1.15. Header Field: Resent-From . . . . . . . . . . . 13 2.1.16. Header Field: Resent-Sender . . . . . . . . . . 14
2.1.17. Header Field: Resent-To . . . . . . . . . . . . 14
2.1.18. Header Field: Resent-Cc . . . . . . . . . . . . 15
2.1.19. Header Field: Resent-Bcc . . . . . . . . . . . . 15
2.1.20. Header Field: Resent-Reply-To . . . . . . . . . 16
2.1.21. Header Field: Resent-Message-ID . . . . . . . . 16
2.1.22. Header Field: Return-Path . . . . . . . . . . . 17
2.1.23. Header Field: Received . . . . . . . . . . . . . 17
2.1.24. Header Field: Encrypted . . . . . . . . . . . . 18
2.1.25. Header Field: Disposition-Notification-To . . . 18
2.1.26. Header Field: Disposition-Notification-Options . 19
2.1.27. Header Field: Accept-Language . . . . . . . . . 19
2.1.28. Header Field: Original-Message-ID . . . . . . . 20
2.1.29. Header Field: PICS-Label . . . . . . . . . . . . 20
2.1.30. Header Field: Encoding . . . . . . . . . . . . . 21
2.1.31. Header Field: List-Archive . . . . . . . . . . . 21
2.1.32. Header Field: List-Help . . . . . . . . . . . . 22
2.1.33. Header Field: List-ID . . . . . . . . . . . . . 22
2.1.34. Header Field: List-Owner . . . . . . . . . . . . 23
2.1.35. Header Field: List-Post . . . . . . . . . . . . 23
2.1.36. Header Field: List-Subscribe . . . . . . . . . . 24
2.1.37. Header Field: List-Unsubscribe . . . . . . . . . 24
2.1.38. Header Field: Message-Context . . . . . . . . . 25
2.1.39. Header Field: DL-Expansion-History . . . . . . . 25
2.1.40. Header Field: Alternate-Recipient . . . . . . . 26
2.1.41. Header Field: Original-Encoded-Information-Types 26
2.1.42. Header Field: Content-Return . . . . . . . . . . 27
2.1.43. Header Field: Generate-Delivery-Report . . . . . 27
2.1.44. Header Field: Prevent-NonDelivery-Report . . . . 28
2.1.45. Header Field: Obsoletes . . . . . . . . . . . . 28
2.1.46. Header Field: Supersedes . . . . . . . . . . . . 29
2.1.47. Header Field: Content-Identifier . . . . . . . . 29
2.1.48. Header Field: Delivery-Date . . . . . . . . . . 30
2.1.49. Header Field: Expiry-Date . . . . . . . . . . . 30
2.1.50. Header Field: Expires . . . . . . . . . . . . . 31
2.1.51. Header Field: Reply-By . . . . . . . . . . . . . 31
2.1.52. Header Field: Importance . . . . . . . . . . . . 32
2.1.53. Header Field: Incomplete-Copy . . . . . . . . . 32
2.1.54. Header Field: Priority . . . . . . . . . . . . . 33
2.1.55. Header Field: Sensitivity . . . . . . . . . . . 33
2.1.56. Header Field: Language . . . . . . . . . . . . . 34
2.1.57. Header Field: Conversion . . . . . . . . . . . . 34
2.1.58. Header Field: Conversion-With-Loss . . . . . . . 35
2.1.59. Header Field: Message-Type . . . . . . . . . . . 35
2.1.60. Header Field: Autosubmitted . . . . . . . . . . 36
2.1.61. Header Field: Autoforwarded . . . . . . . . . . 36
2.1.62. Header Field: Discarded-X400-IPMS-Extensions . . 37
2.1.63. Header Field: Discarded-X400-MTS-Extensions . . 37
2.1.64. Header Field: Disclose-Recipients . . . . . . . 38
2.1.65. Header Field: Deferred-Delivery . . . . . . . . 38
2.1.66. Header Field: Latest-Delivery-Time . . . . . . . 39
2.1.67. Header Field: Originator-Return-Address . . . . 39
2.1.68. Header Field: X400-Content-Identifier . . . . . 40
2.1.69. Header Field: X400-Content-Return . . . . . . . 40
2.1.70. Header Field: X400-Content-Type . . . . . . . . 41
2.1.71. Header Field: X400-MTS-Identifier . . . . . . . 41
2.1.72. Header Field: X400-Originator . . . . . . . . . 42
2.1.73. Header Field: X400-Received . . . . . . . . . . 42
2.1.74. Header Field: X400-Recipients . . . . . . . . . 43
2.1.75. Header Field: X400-Trace . . . . . . . . . . . . 43
2.2. Permanent MIME Header Field Registrations . . . . . . . 44
2.2.1. Header Field: MIME-Version . . . . . . . . . . . 44
2.2.2. Header Field: Content-ID . . . . . . . . . . . . 45
2.2.3. Header Field: Content-Description . . . . . . . 45
2.2.4. Header Field: Content-Transfer-Encoding . . . . 46
2.2.5. Header Field: Content-Type . . . . . . . . . . . 46
2.2.6. Header Field: Content-Base . . . . . . . . . . . 47
2.2.7. Header Field: Content-Location . . . . . . . . . 47
2.2.8. Header Field: Content-features . . . . . . . . . 48
2.2.9. Header Field: Content-Disposition . . . . . . . 48
2.2.10. Header Field: Content-Language . . . . . . . . . 49
2.2.11. Header Field: Content-Alternative . . . . . . . 49
2.2.12. Header Field: Content-MD5 . . . . . . . . . . . 50
2.2.13. Header Field: Content-Duration . . . . . . . . . 50
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 50
4. Security Considerations . . . . . . . . . . . . . . . . . . . 51
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 51
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.1. Normative References . . . . . . . . . . . . . . . . . . 51
6.2. Informative References . . . . . . . . . . . . . . . . . 53
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 53
Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 54
1. Introduction
This document defines IANA registration for a number of mail message
and MIME header fields, per registration procedures for message
header fields [1].
The main body of this document is automatically generated from RDF/N3
data. Some experimental HTML registry pages have been prepared from
the same data and can be found at [27].
1.1. Structure of This Document
Section 2.1 contains the templates for initial registration of mail
message header fields.
Section 2.2 contains templates for initial registration of MIME header 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 BCP 14, RFC 2119 [9].2. Registration Templates
Header field registry entries are summarized in tabular form for convenience of reference and presented in full in the following sections.2.1. Permanent Mail Header Field 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 In-Reply-To Mail Identify replied-to message(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-Reply-To Mail Resent reply-to Resent-Message-ID Mail Message identifier for resent message
Return-Path Mail Message return path
Received Mail Mail transfer trace information
Encrypted Mail Message encryption information
Disposition-Notification-To
Mail Mailbox for sending disposition
notification
Disposition-Notification-Options
Mail Disposition notification options
Accept-Language Mail Language(s) for auto-responses
Original-Message-ID Mail Original message identifier
PICS-Label Mail PICS rating label
Encoding Mail Message encoding and other
information
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
Message-Context Mail Type or context of message
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?
Generate-Delivery-Report
Mail Request delivery report generation
Prevent-NonDelivery-Report
Mail Non-delivery report required?
Obsoletes Mail Reference message to be replaced
Supersedes Mail Reference message to be replaced
Content-Identifier Mail Message content identifier
Delivery-Date Mail Message delivery time
Expiry-Date Mail Message expiry time
Expires 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 language
Conversion Mail Conversion allowed?
Conversion-With-Loss
Mail Lossy conversion allowed?
Message-Type Mail Message type: delivery report?
Autosubmitted Mail Automatically submitted indicator
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
Disclose-Recipients Mail Disclose names of other
recipients?
Deferred-Delivery Mail Deferred delivery information
Latest-Delivery-Time
Mail Latest delivery time requested
Originator-Return-Address
Mail Originator return address
X400-Content-Identifier
Mail Message content identifier
X400-Content-Return Mail Return content on non-delivery?
X400-Content-Type Mail X400 content type
X400-MTS-Identifier Mail X400 MTS-Identifier
X400-Originator Mail X400 Originator
X400-Received Mail X400 Received
X400-Recipients Mail X400 Recipients
X400-Trace Mail X400 Trace
2.1.1. Header Field: Date
Description:
Message date and time
Applicable protocol: Mail [18]
Status: standard
Author/change controller:
IETF (mailto:iesg@ietf.org)
Internet Engineering Task Force
Specification document(s):
RFC 2822 [18] (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. Defined as standard by RFC 822.
2.1.2. Header Field: From
Description: Mailbox of message author Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.2) 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. Defined as standard by RFC 822.2.1.3. Header Field: Sender
Description: Mailbox of message sender Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.2) Related information: Specifies the mailbox of the agent responsible for the actual transmission of the message. Defined as standard by RFC 822.
2.1.4. Header Field: Reply-To
Description: Mailbox for replies to message Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.2) Related information: When the "Reply-To:" field is present, it indicates the mailbox(es) to which the author of the message suggests that replies be sent. Defined as standard by RFC 822.2.1.5. Header Field: To
Description: Primary recipient mailbox Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.3) Related information: Contains the address(es) of the primary recipient(s) of the message. Defined as standard by RFC 822.
2.1.6. Header Field: Cc
Description: Carbon-copy recipient mailbox Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.3) Related information: Contains the addresses of others who are to receive the message, though the content of the message may not be directed at them. Defined as standard by RFC 822.2.1.7. Header Field: Bcc
Description: Blind-carbon-copy recipient mailbox Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (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. Defined as standard by RFC 822.
2.1.8. Header Field: Message-ID
Description: Message identifier Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.4) Related information: Contains a single unique message identifier that refers to a particular version of a particular message. If the message is resent without changes, the original Message-ID is retained. Defined as standard by RFC 822.2.1.9. Header Field: In-Reply-To
Description: Identify replied-to message(s) Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.4) Related information: The message identifier(s) of the original message(s) to which the current message is a reply. Defined as standard by RFC 822.
2.1.10. Header Field: References
Description: Related message identifier(s) Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.4) Related information: The message identifier(s) of other message(s) to which the current message may be related. In RFC 2822, the definition was changed to say that this header field contains a list of all Message-IDs of messages in the preceding reply chain. Defined as standard by RFC 822.2.1.11. Header Field: Subject
Description: Topic of message Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.5) Related information: Contains a short string identifying the topic of the message. Defined as standard by RFC 822.
2.1.12. Header Field: Comments
Description: Additional comments about the message Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.5) Related information: Contains any additional comments on the text of the body of the message. Warning: Some mailers will not show this field to recipients. Defined as standard by RFC 822.2.1.13. Header Field: Keywords
Description: Message key words and/or phrases Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.5) Related information: Contains a comma-separated list of important words and phrases that might be useful for the recipient. Defined as standard by RFC 822.
2.1.14. Header Field: Resent-Date
Description: Date and time message is resent Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.6) Related information: Contains the date and time that a message is reintroduced into the message transfer system. Defined as standard by RFC 822.2.1.15. Header Field: Resent-From
Description: Mailbox of person for whom message is resent Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (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 behalf the message has been resent. Defined as standard by RFC 822.
2.1.16. Header Field: Resent-Sender
Description: Mailbox of person who actually resends the message Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (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. Defined as standard by RFC 822.2.1.17. Header Field: Resent-To
Description: Mailbox to which message is resent Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.6) Related information: Contains the mailbox(es) to which the message has been resent. Defined as standard by RFC 822.
2.1.18. Header Field: Resent-Cc
Description: Mailbox(es) to which message is cc'ed on resend Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.6) Related information: Contains the mailbox(es) to which message is cc'ed on resend. Defined as standard by RFC 822.2.1.19. Header Field: Resent-Bcc
Description: Mailbox(es) to which message is bcc'ed on resend Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.6) Related information: Contains the mailbox(es) to which message is bcc'ed on resend. Defined as standard by RFC 822.
2.1.20. Header Field: Resent-Reply-To
Description: Resent reply-to Applicable protocol: Mail [18] Status: obsolete Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] Related information: Resent Reply-to. Defined by RFC 822, obsoleted by RFC 2822.2.1.21. Header Field: Resent-Message-ID
Description: Message identifier for resent message Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.6) Related information: Contains a message identifier for a resent message. Defined as standard by RFC 822.
2.1.22. Header Field: Return-Path
Description: Message return path Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (section 3.6.7) Related information: Return path for message response diagnostics. See also RFC 2821 [17]. Defined as standard by RFC 822.2.1.23. Header Field: Received
Description: Mail transfer trace information Applicable protocol: Mail [18] Status: standard Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2822 [18] (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 [17]. Defined as standard by RFC 822.
2.1.24. Header Field: Encrypted
Description: Message encryption information Applicable protocol: Mail [18] Status: obsolete Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 822 [2] Related information: Defined by RFC 822, but was found to be inadequately specified, was not widely implemented, and was removed in RFC 2822. Current practice is to use separate encryption, such as S/MIME or OpenPGP, possibly in conjunction with RFC 1847 MIME security multiparts.2.1.25. Header Field: Disposition-Notification-To
Description: Mailbox for sending disposition notification Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2298 [12] Related information: Indicates that the sender wants a disposition notification when this message is received (read, processed, etc.) by its recipients.
2.1.26. Header Field: Disposition-Notification-Options
Description: Disposition notification options Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2298 [12] Related information: For optional modifiers on disposition notification requests.2.1.27. Header Field: Accept-Language
Description: Language(s) for auto-responses Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 3282 [21] Related information: Indicates a language that the message sender requests to be used for responses. Accept-language was not designed for email but has been considered useful as input to the generation of automatic replies. Some problems have been noted concerning its use with email, including but not limited to determination of the email address to which it refers; cost and lack of effective internationalization of email responses; interpretation of language subtags; and determining what character set encoding should be used.
2.1.28. Header Field: Original-Message-ID
Description: Original message identifier Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 3297 [22] Related information: Original message identifier used with resend of message with alternative content format; identifies the original message data to which it corresponds.2.1.29. Header Field: PICS-Label
Description: PICS rating label Applicable protocol: Mail [18] Status: standard Author/change controller: W3C (mailto:web-human@w3.org) World Wide Web Consortium Specification document(s): PICS-labels [24] Related information: Ratings label to control selection (filtering) of messages according to the PICS protocol. Specified for general use with RFC 822 message format, with HTTP-specific extensions.
2.1.30. Header Field: Encoding
Description: Message encoding and other information Applicable protocol: Mail [18] Status: experimental Author/change controller: Albert K. Costanzo (mailto:AL@AKC.COM) AKC Consulting Inc. Specification document(s): RFC 1505 [4] 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, and some in other ways.2.1.31. Header Field: List-Archive
Description: URL of mailing list archive Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to use to browse the archives of the mailing list from which this message was relayed.
2.1.32. Header Field: List-Help
Description: URL for mailing list information Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to use to get information about the mailing list from which this message was relayed.2.1.33. Header Field: List-ID
Description: Mailing list identifier Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2919 [20] Related information: Stores an identification of the mailing list through which this message was distributed.
2.1.34. Header Field: List-Owner
Description: URL for mailing list owner's mailbox Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to send e-mail to the owner of the mailing list from which this message was relayed.2.1.35. Header Field: List-Post
Description: URL for mailing list posting Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to use to send contributions to the mailing list from which this message was relayed.
2.1.36. Header Field: List-Subscribe
Description: URL for mailing list subscription Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to use to get a subscription to the mailing list from which this message was relayed.2.1.37. Header Field: List-Unsubscribe
Description: URL for mailing list unsubscription Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2369 [13] Related information: Contains the URL to use to unsubscribe the mailing list from which this message was relayed.
2.1.38. Header Field: Message-Context
Description: Type or context of message Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 3458 [23] Related information: Provides information about the context and presentation characteristics of a message. Can have the values 'voice- message', 'fax-message', 'pager-message', 'multimedia-message', 'text-message', or 'none'.2.1.39. Header Field: DL-Expansion-History
Description: Trace of distribution lists passed Applicable protocol: Mail [18] Status: standards-track Author/change controller: IETF (mailto:iesg@ietf.org) Internet Engineering Task Force Specification document(s): RFC 2156 [10] Related information: Trace of distribution lists passed. (MIXER X.400 mapping; not for general use.)