Mailing Lists and UTF-8 Addresses
draft-ietf-eai-mailinglistbis-02

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Document Type Active Internet-Draft (eai WG)
Last updated 2012-06-29 (latest revision 2012-06-23)
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EAI                                                            J. Levine
Internet-Draft                                      Taughannock Networks
Intended status: Informational                                R. Gellens
Expires: December 01, 2012                         Qualcomm Incorporated
                                                               June 2012

                   Mailing Lists and UTF-8 Addresses
                    draft-ietf-eai-mailinglistbis-02

Abstract

   This document describes considerations for mailing lists with the
   introduction of internationalized email addresses.  It outlines some
   possible scenarios for handling lists with mixtures of
   internationalized and traditional addresses, but does not offer
   implementation or deployment advice.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on December 01, 2012.

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
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Table of Contents

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

Levine & Gellens       Expires December 01, 2012                [Page 1]
Internet-Draft     Mailing Lists and UTF-8 Addresses           June 2012

     1.1.  Mailing list header additions and modifications  . . . . .  3
     1.2.  Internationalized email addresses  . . . . . . . . . . . .  3
   2.  Scenarios Involving Mailing Lists  . . . . . . . . . . . . . .  4
     2.1.  Fully EAI lists  . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Mixed EAI and ASCII lists  . . . . . . . . . . . . . . . .  4
     2.3.  SMTP issues  . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  List headers . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  EAI list headers . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  Downgrading list headers . . . . . . . . . . . . . . . . .  7
     3.3.  Subscribers' addresses in downgraded headers . . . . . . .  7
   4.  Security considerations  . . . . . . . . . . . . . . . . . . .  8
   5.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
   Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . .  8
     Appendix A.1.  Changes up to -02 . . . . . . . . . . . . . . . .  8
     Appendix A.2.  Changes up to -00 . . . . . . . . . . . . . . . .  8
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  9

1.  Introduction

   This document describes considerations for mailing lists with the
   introduction of internationalized email addresses.

   Mailing lists are an important part of email usage and collaborative
   communications.  The introduction of internationalized email
   addresses affects mailing lists in three main areas: (1) transport
   (receiving and sending messages); (2) message headers of received and
   retransmitted messages; and (3) mailing list operational policies.

   A mailing list is a mechanism that distributes a message to multiple
   recipients when the originator sends it to a single address.  An
   agent (typically not a human being) at that single address receives
   the message and then causes the message to be redistributed to a list
   of recipients.  This agent sets the envelope return address of the
   redistributed message to a different address from that of the
   original message.  Using a different envelope return address
   (reverse-path) directs error and other automatically generated
   messages to an error handling address associated with the mailing
   list.  This sends error and other automatic messages to the list
   agent, which can often do something useful with them, rathern than to
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