Simple Mail Transfer Protocol Extension for Message Transfer Priorities
RFC 6710
| Document | Type |
RFC - Proposed Standard
(August 2012; Errata)
Was draft-melnikov-smtp-priority (individual in app area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6710 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Pete Resnick | ||
| Send notices to | barryleiba@computer.org | ||
Internet Engineering Task Force (IETF) A. Melnikov
Request for Comments: 6710 Isode Ltd
Category: Standards Track K. Carlberg
ISSN: 2070-1721 G11
August 2012
Simple Mail Transfer Protocol Extension for Message Transfer Priorities
Abstract
This memo defines an extension to the SMTP (Simple Mail Transfer
Protocol) service whereby messages are given a label to indicate
preferential handling, to enable mail handling nodes to take this
information into account for onward processing.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6710.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Melnikov & Carlberg Standards Track [Page 1]
RFC 6710 Message Transfer Priority SMTP Extension August 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 4
3. Definition of the Priority SMTP Extension . . . . . . . . . . 4
4. Handling of Messages Received via SMTP . . . . . . . . . . . . 5
4.1. Handling of the MT-PRIORITY Parameter by the Receiving
SMTP Server . . . . . . . . . . . . . . . . . . . . . . . 5
4.2. Relay of Messages to Other Conforming SMTP/LMTP Servers . 6
4.3. Relay of Messages to Non-Conforming SMTP/LMTP Servers . . 7
4.4. Mailing Lists and Aliases . . . . . . . . . . . . . . . . 7
4.5. Gatewaying a Message into a Foreign Environment . . . . . 7
4.6. Interaction with the DSN SMTP Extension . . . . . . . . . 7
5. The Priority Service Extension . . . . . . . . . . . . . . . . 8
5.1. Expedited Transfer . . . . . . . . . . . . . . . . . . . . 9
5.2. Timely Delivery . . . . . . . . . . . . . . . . . . . . . 10
6. Use of MT-PRIORITY with LMTP . . . . . . . . . . . . . . . . . 10
7. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9. Deployment Considerations . . . . . . . . . . . . . . . . . . 14
9.1. Multiple MX Records . . . . . . . . . . . . . . . . . . . 14
9.2. Priority Assignment Policies . . . . . . . . . . . . . . . 15
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
10.1. Requirements on Priority Assignment Policy
Registrations . . . . . . . . . . . . . . . . . . . . . . 17
10.2. Initial Priority Assignment Policy Registrations . . . . . 18
11. Security Considerations . . . . . . . . . . . . . . . . . . . 18
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12.1. Normative References . . . . . . . . . . . . . . . . . . . 19
12.2. Informative References . . . . . . . . . . . . . . . . . . 20
Appendix A. Priority Assignment Policy for Military Messaging . . 22
Appendix B. Priority Assignment Policy for MIXER . . . . . . . . 23
Appendix C. Priority Assignment Policy for National Security
/ Emergency Preparedness (NS/EP) . . . . . . . . . . 24
Appendix D. Possible Implementation Strategies . . . . . . . . . 25
D.1. Probability . . . . . . . . . . . . . . . . . . . . . . . 25
D.2. Preemption of Sessions or Transactions . . . . . . . . . . 25
D.3. Resource Allocation Models . . . . . . . . . . . . . . . . 26
Appendix E. Background on Design Choices . . . . . . . . . . . . 26
Appendix F. Acknowledgements . . . . . . . . . . . . . . . . . . 27
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