Tunneling of SMTP Message Transfer Priorities
draft-melnikov-smtp-priority-tunneling-01

The information below is for an old version of the document
Document Type Active Internet-Draft (individual in app area)
Last updated 2012-05-31 (latest revision 2012-05-02)
Stream IETF
Intended RFC status Experimental
Formats plain text pdf html
Stream WG state (None)
Document shepherd None
IESG IESG state Publication Requested
Telechat date
Responsible AD Pete Resnick
Send notices to alexey.melnikov@isode.com, carlberg@g11.org.uk, draft-melnikov-smtp-priority-tunneling@tools.ietf.org
Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Experimental                                K. Carlberg
Expires: November 3, 2012                                            G11
                                                             May 2, 2012

             Tunneling of SMTP Message Transfer Priorities
               draft-melnikov-smtp-priority-tunneling-01

Abstract

   This memo defines a mechanism for tunneling of SMTP (Simple Mail
   Transfer Protocol) Message Transfer Priority values through MTAs
   (Message Transfer Agents) that don't support the MT-PRIORITY SMTP
   extension.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on November 3, 2012.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Melnikov & Carlberg     Expires November 3, 2012                [Page 1]
Internet-Draft  Tunneling of Message Transfer Priorities        May 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  4
   3.  Handling of messages received via SMTP . . . . . . . . . . . .  4
     3.1.  Handling of the MT-PRIORITY parameter by the receiving
           SMTP server  . . . . . . . . . . . . . . . . . . . . . . .  4
     3.2.  Relay of messages to other conforming SMTP servers . . . .  6
     3.3.  Relay of messages to non-conforming SMTP servers . . . . .  6
     3.4.  Mailing lists and Aliases  . . . . . . . . . . . . . . . .  7
     3.5.  Gatewaying a message into a foreign environment  . . . . .  7
     3.6.  Interaction with DSN SMTP Extension  . . . . . . . . . . .  7
   4.  Header field: MT-Priority  . . . . . . . . . . . . . . . . . .  7
   5.  Example  . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
     7.1.  Modification of MT-Priority header field and DKIM  . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Acknowledgements  . . . . . . . . . . . . . . . . . . 12

Melnikov & Carlberg     Expires November 3, 2012                [Page 2]
Internet-Draft  Tunneling of Message Transfer Priorities        May 2012

1.  Introduction

   This document is an experimental extension to the SMTP Message
   Transfer Priorities extension [SMTP-PRIORITY].  It specifies
   application layer tunneling of message priority, to convey the
   priority of the messages through Message Transfer Agents (MTAs) that
   do not support the Message Transfer Priorities extension.  The
   tunneling is done by adding a new message header field to Internet
   message format specified in [RFC5322].

   A number of other header fields are already in use, mostly in Mail
   User Agents (MUAs), to convey meanings related to importance or
   priority of messages.  Example of such header fields are Importance
   [RFC2156], Priority [RFC2156] and X-Priority (undocumented).
   Considering sometimes subtle and sometimes significant differences in
   the meaning of these header fields and widely different syntax, this
   document defines a new header field.
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