Mailing Lists and Non-ASCII Addresses
RFC 6783
Document | Type |
RFC - Informational
(November 2012; No errata)
Obsoletes RFC 5983
|
|
---|---|---|---|
Authors | John Levine , Randall Gellens | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | Joseph Yee | ||
IESG | IESG state | RFC 6783 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Pete Resnick | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) J. Levine Request for Comments: 6783 Taughannock Networks Obsoletes: 5983 R. Gellens Category: Informational Qualcomm Incorporated ISSN: 2070-1721 November 2012 Mailing Lists and Non-ASCII Addresses Abstract This document describes considerations for mailing lists with the introduction of non-ASCII UTF-8 email addresses. It outlines some possible scenarios for handling lists with mixtures of non-ASCII and traditional addresses but does not specify protocol changes or offer implementation or deployment advice. 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 http://www.rfc-editor.org/info/rfc6783. 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 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. Levine & Gellens Informational [Page 1] RFC 6783 Mailing Lists and Non-ASCII Addresses November 2012 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Mailing List Header Additions and Modifications . . . . . . 3 1.2. Non-ASCII Email Addresses . . . . . . . . . . . . . . . . . 3 2. Scenarios Involving Mailing Lists . . . . . . . . . . . . . . . 4 2.1. Fully SMTPUTF8 Lists . . . . . . . . . . . . . . . . . . . 4 2.2. Mixed SMTPUTF8 and ASCII Lists . . . . . . . . . . . . . . 5 2.3. SMTP Issues . . . . . . . . . . . . . . . . . . . . . . . . 5 3. List Headers . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1. SMTPUTF8 List Headers . . . . . . . . . . . . . . . . . . . 6 3.2. Downgrading List Headers . . . . . . . . . . . . . . . . . 7 3.3. Subscribers' Addresses in Downgraded Headers . . . . . . . 8 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 8 5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1. Normative References . . . . . . . . . . . . . . . . . . . 8 5.2. Informative References . . . . . . . . . . . . . . . . . . 9 1. Introduction This document describes considerations for mailing lists with the introduction of non-ASCII UTF-8 email addresses. The usage of such addresses is described in [RFC6530]. 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, usually software rather than a person, at that single address receives the message and then causes the message to be redistributed to a list of recipients. This agent usually sets the envelope return address (henceforth called the "bounce address") of the redistributed message to a different address from that of the original message. Using a different bounce address 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, rather than to the original sender, who typically doesn't control the list and hence can't do anything about them. In most cases, the mailing list agent redistributes a received message to its subscribers as a new message, that is, conceptually itShow full document text