Multicast Email (MULE) over ACP 142
draft-melnikov-email-over-pmul-05

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Network Working Group                                          D. Wilson
Internet-Draft                                          A. Melnikov, Ed.
Intended status: Informational                                 Isode Ltd
Expires: December 3, 2018                                   June 1, 2018

                  Multicast Email (MULE) over ACP 142
                   draft-melnikov-email-over-pmul-05

Abstract

   ACP 142 defines P_MUL, which is a protocol for reliable multicast
   suitable for bandwidth constrained and delayed acknowledgement
   (Emissions Control or "EMCON") environments running over UDP.  This
   document is a specification of the basic protocol for electronic mail
   transfer over ACP 142 to enable MTA to MTA transfer.  It explains how
   MULE can be used in conjunction with Simple Mail Transfer Protocol
   (RFC 5321), including some common SMTP extensions, to provide an
   alternate MTA to MTA transfer mechanism.

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 December 3, 2018.

Copyright Notice

   Copyright (c) 2018 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
   (https://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

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Internet-Draft             Email over ACP 142                  June 2018

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  MULE  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  BSMTP-like Payload construction . . . . . . . . . . . . .   5
     3.2.  Payload compression . . . . . . . . . . . . . . . . . . .   6
     3.3.  Error handling  . . . . . . . . . . . . . . . . . . . . .   8
   4.  Gatewaying from Internet Mail to MULE . . . . . . . . . . . .   8
     4.1.  Use of BDAT . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Gatewaying from MULE to Internet Mail . . . . . . . . . . . .   9
     5.1.  Handling of ESMTP extensions and Error handling . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  SMTP Extension Support in MULE  . . . . . . . . . . . . .  10
     6.2.  SMTP Extension Support in MULE  . . . . . . . . . . . . .  12
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   P_MUL [ACP142A] is a transport protocol for reliable multicast in
   bandwidth constrained and delayed acknowledgement environments
   running on top of UDP.  The objectives of this protocol are first to
   take advantage of the bandwidth saving feature of using the multicast
   service as supported by modern computer networks and second to allow
   message transfer under EMCON conditions.  EMCON (Emission Control) or
   "Radio Silence" means that, although receiving nodes are able to
   receive messages, they are not able to acknowledge the receipt of
   messages.

   The objective of this protocol is to take advantage of multicast
   communication for the transfer of messages between MTAs (Message
   Transfer Agents) on a single multicast network under normal - which
   means dialogue oriented - communication condition and under EMCON
   condition.  EMCON condition means that a receiving node is able to
   receive messages, but it cannot - for a relatively long time (hours
   or even days) - acknowledge the received messages.

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