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Tunneling of SMTP Message Transfer Priorities (RFC6758) Disclosure Number: IPCOM000222618D
Original Publication Date: 2012-Oct-01
Included in the Prior Art Database: 2012-Oct-19
Document File: 22 page(s) / 22K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Melnikov: AUTHOR [+1]


The SMTP Message Transfer Priorities extension [RFC6710] specifies a mechanism to allow messages to be given a label to indicate preferential handling, to enable mail handling nodes to take this into account for onward processing. However, as with all SMTP extensions, all SMTP Message Transfer Agents (MTAs) between the source and the destination must support the extension in order for it to be successfully used. This document describes an application- layer tunneling of message priority, to convey the priority of the messages through MTAs that do not support the Message Transfer Priorities extension. The tunneling is done by adding a new message header field to the Internet Message Format specified in [RFC5322].

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Internet Engineering Task Force (IETF)                       A. Melnikov Request for Comments: 6758                                     Isode Ltd Category: Informational                                      K. Carlberg ISSN: 2070-1721                                                      G11                                                             October 2012

              Tunneling of SMTP Message Transfer Priorities


   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 document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see 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

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    ( 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           Informational                     [Page 1]
 RFC 6758        Tunneling of Message Transfer Priorities    October 2012

 Table of Contents

   1. Introduction ....................................................2

   2. Conventions Used in This Document ...............................3

   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/LMTP Servers ....4