Simple Mail Transfer Protocol extension for Message Transfer Priorities
draft-melnikov-smtp-priority-20
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2012-07-03
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alexey.melnikov@isode.com, carlberg@g11.org.uk, draft-melnikov-smtp-priority@tools.ietf.org, barryleiba@computer.org
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Network Working Group A. Melnikov
Internet-Draft Isode Ltd
Intended status: Standards Track K. Carlberg
Expires: January 4, 2013 G11
July 3, 2012
Simple Mail Transfer Protocol extension for Message Transfer Priorities
draft-melnikov-smtp-priority-20
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
into account for onward processing.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 4, 2013.
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
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Melnikov & Carlberg Expires January 4, 2013 [Page 1]
Internet-Draft Message Transfer Priority SMTP Extension July 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 servers . . . . 6
4.3. Relay of messages to non-conforming SMTP servers . . . . . 7
4.4. Mailing lists and Aliases . . . . . . . . . . . . . . . . 7
4.5. Gatewaying a message into a foreign environment . . . . . 7
4.6. Interaction with 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9. Deployment Considerations . . . . . . . . . . . . . . . . . . 14
9.1. Multiple MX records . . . . . . . . . . . . . . . . . . . 14
9.2. Priority Assignment Policies . . . . . . . . . . . . . . . 14
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
10.1. Requirements on Priority Assignment Policy
registrations . . . . . . . . . . . . . . . . . . . . . . 17
10.2. Initial Priority Assignment Policy registrations . . . . . 18
11. Security Considerations . . . . . . . . . . . . . . . . . . . 19
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12.1. Normative References . . . . . . . . . . . . . . . . . . . 19
12.2. Informative References . . . . . . . . . . . . . . . . . . 20
Appendix A. Priority Assignment Policy for Military Messaging . . 21
Appendix B. Priority Assignment Policy for MIXER . . . . . . . . 22
Appendix C. Priority Assignment Policy for National Security
/ Emergency Preparedness (NS/EP) . . . . . . . . . . 23
Appendix D. Possible implementation strategies . . . . . . . . . 24
D.1. Probability . . . . . . . . . . . . . . . . . . . . . . . 25
D.2. Preemption of sessions or transactions . . . . . . . . . . 25
D.3. Resource Allocation Models . . . . . . . . . . . . . . . . 25
Appendix E. Background on Design Choices . . . . . . . . . . . . 26
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