draft-ietf-eai-smtpext-07.txt   draft-ietf-eai-smtpext-08.txt 
Network Working Group J. Yao, Ed. Network Working Group J. Yao, Ed.
Internet-Draft W. Mao, Ed. Internet-Draft W. Mao, Ed.
Intended status: Experimental CNNIC Intended status: Experimental CNNIC
Expires: January 1, 2008 June 30, 2007 Expires: March 6, 2008 September 3, 2007
SMTP extension for internationalized email address SMTP extension for internationalized email address
draft-ietf-eai-smtpext-07.txt draft-ietf-eai-smtpext-08.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
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This Internet-Draft will expire on January 1, 2008. This Internet-Draft will expire on March 6, 2008.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2007).
Abstract Abstract
This document specifies the use of SMTP extension for This document specifies the use of SMTP extension for
internationalized email address delivery. Communication with systems internationalized email address delivery. Communication with systems
that do not implement this specification is specified in another that do not implement this specification is specified in another
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8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
9. Change History . . . . . . . . . . . . . . . . . . . . . . . . 15 9. Change History . . . . . . . . . . . . . . . . . . . . . . . . 15
9.1. draft-ietf-eai-smtpext: Version 00 . . . . . . . . . . . . 15 9.1. draft-ietf-eai-smtpext: Version 00 . . . . . . . . . . . . 15
9.2. draft-ietf-eai-smtpext: Version 01 . . . . . . . . . . . . 15 9.2. draft-ietf-eai-smtpext: Version 01 . . . . . . . . . . . . 15
9.3. draft-ietf-eai-smtpext: Version 02 . . . . . . . . . . . . 16 9.3. draft-ietf-eai-smtpext: Version 02 . . . . . . . . . . . . 16
9.4. draft-ietf-eai-smtpext: Version 03 . . . . . . . . . . . . 16 9.4. draft-ietf-eai-smtpext: Version 03 . . . . . . . . . . . . 16
9.5. draft-ietf-eai-smtpext: Version 04 . . . . . . . . . . . . 16 9.5. draft-ietf-eai-smtpext: Version 04 . . . . . . . . . . . . 16
9.6. draft-ietf-eai-smtpext: Version 05 . . . . . . . . . . . . 16 9.6. draft-ietf-eai-smtpext: Version 05 . . . . . . . . . . . . 16
9.7. draft-ietf-eai-smtpext: Version 06 . . . . . . . . . . . . 16 9.7. draft-ietf-eai-smtpext: Version 06 . . . . . . . . . . . . 16
9.8. draft-ietf-eai-smtpext: Version 07 . . . . . . . . . . . . 16 9.8. draft-ietf-eai-smtpext: Version 07 . . . . . . . . . . . . 16
9.9. draft-ietf-eai-smtpext: Version 08 . . . . . . . . . . . . 17
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10.1. Normative References . . . . . . . . . . . . . . . . . . . 17 10.1. Normative References . . . . . . . . . . . . . . . . . . . 17
10.2. Informative References . . . . . . . . . . . . . . . . . . 18 10.2. Informative References . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
Intellectual Property and Copyright Statements . . . . . . . . . . 20 Intellectual Property and Copyright Statements . . . . . . . . . . 20
1. Introduction 1. Introduction
Internationalized email address includes two parts, the local part Internationalized email address includes two parts, the local part
and the domain part. The ways email addresses are used by protocols and the domain part. The ways email addresses are used by protocols
are different from the ways domain names are used. The most critical are different from the ways domain names are used. The most critical
difference is that emails are delivered through a chain of peering difference is that emails are delivered through a chain of peering
clients and servers while domain names are resolved by name servers clients and servers while domain names are resolved by name servers
by looking up their own tables. In addition to this, email transport by looking up their own tables. In addition to this, email transport
protocol ESMTP[RFC1869] provide a negotiation mechanism through which protocol ESMTP[RFC1869] provides a negotiation mechanism through
clients can make decisions for further processing; please see more in which clients can make decisions for further processing; please see
[EAI-framework]. Email addresses can exploit the SMTP extension more in [EAI-framework]. Email addresses can exploit the SMTP
negotiation mechanism while Internationalized Domain Name(IDN) does extension negotiation mechanism while Internationalized Domain
not have such a facility. This is also more desirable Name(IDN) does not have such a facility. This is also more
architecturally. This document specifies an SMTP extension to permit architecturally desirable approach. This document specifies an SMTP
internationalized email addresses in envelopes, and UTF-8 in headers. extension to permit internationalized email addresses in envelopes,
The protocol described here is an MTA solution which is feasible, and UTF-8 in headers. The protocol described here is an MTA solution
architecturally elegant, and not difficult to deploy. which is feasible, architecturally elegant, and not difficult to
deploy.
1.1. Role of this specification 1.1. Role of this specification
The framework document [EAI-framework] specifies the requirements The framework document [EAI-framework] specifies the requirements
for, and components of, full internationalization of electronic mail. for, and components of, full internationalization of electronic mail.
To understand and implement this specification, understanding the To understand and implement this specification, understanding the
context presented in [EAI-framework] is necessary. context presented in [EAI-framework] is necessary.
This document specifies an element of that work, specifically the This document specifies an element of that work, specifically the
definition of an SMTP extension [RFC1869] for the internationalized definition of an SMTP extension [RFC1869] for the internationalized
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See the extended security considerations discussion in See the extended security considerations discussion in
[EAI-framework] [EAI-framework]
8. Acknowledgements 8. Acknowledgements
Much of the text in the initial version of this document was derived Much of the text in the initial version of this document was derived
or copied from [Klensin-emailaddr] with the permission of the author. or copied from [Klensin-emailaddr] with the permission of the author.
Significant comments and suggestions were received from Xiaodong LEE, Significant comments and suggestions were received from Xiaodong LEE,
Nai-Wen Hsu, Yangwoo KO, Yoshiro YONEYA, and other members of the JET Nai-Wen Hsu, Yangwoo KO, Yoshiro YONEYA, and other members of the JET
team and were incorporated into the document. Special thanks to team and were incorporated into the document. Special thanks to
those contributors for this version of document, those includes (but those contributors for this version of the document, those include
not limited to) John C Klensin, Charles Lindsey, Dave Crocker, Harald (but not limited to) John C Klensin, Charles Lindsey, Dave Crocker,
Tveit Alvestrand, Marcos Sanz, Chris Newman, Martin Duerst, Edmon Harald Tveit Alvestrand, Marcos Sanz, Chris Newman, Martin Duerst,
Chung, Tony Finch, Kari Hurtta, Randall Gellens, Frank Ellermann, Edmon Chung, Tony Finch, Kari Hurtta, Randall Gellens, Frank
Alexey Melnikov. Of course, none of the individuals are necessarily Ellermann, Alexey Melnikov. Of course, none of the individuals are
responsible for the combination of ideas represented here. necessarily responsible for the combination of ideas represented
here.
9. Change History 9. Change History
[[anchor25: REMOVE THIS: This section is used for tracking the update [[anchor25: REMOVE THIS: This section is used for tracking the update
of this document. It may be useful to retain parts of it to of this document. It may be useful to retain parts of it to
facilitate establishing dates and documents for the history of this facilitate establishing dates and documents for the history of this
work.]] work.]]
9.1. draft-ietf-eai-smtpext: Version 00 9.1. draft-ietf-eai-smtpext: Version 00
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9.7. draft-ietf-eai-smtpext: Version 06 9.7. draft-ietf-eai-smtpext: Version 06
o Delete the section about message retry. o Delete the section about message retry.
o Add the new subsection about Mail eXchangers o Add the new subsection about Mail eXchangers
o Add the new section about "UTF-8 Reply" o Add the new section about "UTF-8 Reply"
o Refine some response code for the section "Using the ALT-ADDRESS o Refine some response code for the section "Using the ALT-ADDRESS
parameter" parameter"
9.8. draft-ietf-eai-smtpext: Version 07 9.8. draft-ietf-eai-smtpext: Version 07
o Rename the section 2.5 o Rename the section 2.5
o Refine sthe section 2.7 o Refine sthe section 2.7
9.9. draft-ietf-eai-smtpext: Version 08
o Refine some texts and update some references
10. References 10. References
10.1. Normative References 10.1. Normative References
[ASCII] Cerf, V., "ASCII format for network interchange", RFC 20, [ASCII] Cerf, V., "ASCII format for network interchange", RFC 20,
October 1969. October 1969.
[EAI-framework] [EAI-framework]
Klensin, J. and Y. Ko, "Overview and Framework for Klensin, J. and Y. Ko, "Overview and Framework for
Internationalized Email", draft-ietf-eai-framework-05.txt Internationalized Email", RFC 4952, July 2007.
(work in progress), 2 2007.
[EAI-utf8header] [EAI-utf8header]
Yeh, J., "Transmission of Email Headers in UTF-8 Abel, Y., "Transmission of Email Headers in UTF-8
Encoding", draft-ietf-eai-utf8headers-05.txt (work in Encoding", draft-ietf-eai-utf8headers-07.txt (work in
progress), April 2007. progress), September 2007.
[RFC1652] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D. [RFC1652] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D.
Crocker, "SMTP Service Extension for 8bit-MIMEtransport", Crocker, "SMTP Service Extension for 8bit-MIMEtransport",
RFC 1652, July 1994. RFC 1652, July 1994.
[RFC1869] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D. [RFC1869] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D.
Crocker, "SMTP Service Extensions", STD 10, RFC 1869, Crocker, "SMTP Service Extensions", STD 10, RFC 1869,
November 1995. November 1995.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
skipping to change at page 18, line 13 skipping to change at page 18, line 23
[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO [RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO
10646", RFC 3629, November 2003. 10646", RFC 3629, November 2003.
[RFC4234] Crocker, D. and P. Overell, "Augmented BNF for Syntax [RFC4234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005. Specifications: ABNF", RFC 4234, October 2005.
10.2. Informative References 10.2. Informative References
[EAI-downgrading] [EAI-downgrading]
YONEYA, Y., Ed. and K. Fujiwara, Ed., "Downgrading YONEYA, Y., Ed. and K. Fujiwara, Ed., "Downgrading
mechanism for Internationalized eMail Address (IMA)", mechanism for Internationalized eMail Address",
draft-ietf-eai-downgrade-02 (work in progress), draft-ietf-eai-downgrade-04 (work in progress), 7 2007.
August 2006.
[EAI-dsn] Newman, C., "SMTP extensions for DSNs", [EAI-dsn] Newman, C. and A. Melnikov, "SMTP extensions for DSNs",
draft-ietf-eai-dsn-00.txt (work in progress), 1 2007. draft-ietf-eai-dsn-03.txt (work in progress), 9 2007.
[EAI-imap] [EAI-imap]
Resnick, P. and C. Newman, "Considerations for IMAP in Resnick, P. and C. Newman, "Considerations for IMAP in
Conjunction with Email Address Internationalization", Conjunction with Email Address Internationalization",
draft-ietf-eai-imap-utf8-01 (work in progress), draft-ietf-eai-imap-utf8-01 (work in progress),
March 2007. March 2007.
[EAI-mailing list] [EAI-mailing list]
Gellens, R. and E. Chung, "Mailing Lists and Gellens, R. and E. Chung, "Mailing Lists and
Internationalized Email Addresses", Internationalized Email Addresses",
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