Overview and Framework for Internationalized Email
RFC 6530
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RFC - Proposed Standard
(February 2012; No errata)
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2015-10-14
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IETF
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RFC 6530 (Proposed Standard)
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Pete Resnick
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Internet Engineering Task Force (IETF) J. Klensin
Request for Comments: 6530 Y. Ko
Obsoletes: 4952, 5504, 5825 February 2012
Category: Standards Track
ISSN: 2070-1721
Overview and Framework for Internationalized Email
Abstract
Full use of electronic mail throughout the world requires that
(subject to other constraints) people be able to use close variations
on their own names (written correctly in their own languages and
scripts) as mailbox names in email addresses. This document
introduces a series of specifications that define mechanisms and
protocol extensions needed to fully support internationalized email
addresses. These changes include an SMTP extension and extension of
email header syntax to accommodate UTF-8 data. The document set also
includes discussion of key assumptions and issues in deploying fully
internationalized email. This document is a replacement for RFC
4952; it reflects additional issues identified since that document
was published.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on
Internet Standards is available in 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/rfc6530.
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
Klensin & Ko Standards Track [Page 1]
RFC 6530 Internationalized Email Framework February 2012
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.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Klensin & Ko Standards Track [Page 2]
RFC 6530 Internationalized Email Framework February 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Role of This Specification . . . . . . . . . . . . . . . . . . 4
3. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 5
4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. Mail User and Mail Transfer Agents . . . . . . . . . . . . 6
4.2. Address Character Sets . . . . . . . . . . . . . . . . . . 7
4.3. User Types . . . . . . . . . . . . . . . . . . . . . . . . 7
4.4. Messages . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5. Mailing Lists . . . . . . . . . . . . . . . . . . . . . . 8
4.6. Conventional Message and Internationalized Message . . . . 8
4.7. Undeliverable Messages, Notification, and Delivery
Receipts . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Overview of the Approach and Document Plan . . . . . . . . . . 9
6. Review of Experimental Results . . . . . . . . . . . . . . . . 9
7. Overview of Protocol Extensions and Changes . . . . . . . . . 10
7.1. SMTP Extension for Internationalized Email Address . . . . 10
7.2. Transmission of Email Header Fields in UTF-8 Encoding . . 11
7.3. SMTP Service Extension for DSNs . . . . . . . . . . . . . 12
8. Downgrading before and after SMTP Transactions . . . . . . . . 12
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