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ObsoletedEXPERIMENTALIETF stream

RFC 5504: Downgrading Mechanism for Email Address Internationalization

This RFC has been replaced. Do not implement against it for new work — it was formally obsoleted by RFC 6530.

Current document in this lineage: RFC 6530 — Overview and Framework for Internationalized Email

In plain English — editorial summary, not part of the RFC

Traditional mail systems handle only ASCII characters in SMTP envelope and mail header fields. The Email Address Internationalization (UTF8SMTP) extension allows UTF-8 characters in SMTP envelope and mail header fields. To avoid rejecting internationalized email messages when a server in the delivery path does not support the UTF8SMTP extension, some sort of converting mechanism is required. This document describes a downgrading mechanism for Email Address Internationalization. Note that this is a way to downgrade, not tunnel. There is no associated up-conversion mechanism, although internationalized email clients might use original internationalized addresses or other data when displaying or replying to downgraded messages. This memo defines an Experimental Protocol for the Internet community.

Document record

Document ID
RFC5504
Published
March 2009
Authors
K. Fujiwara; Y. Yoneya
Status
EXPERIMENTAL
Stream
IETF
Area
app
Pages
24
Also known as
—
Obsoleted by:
RFC 6530

Topics

Standards lineage

This document is one revision in a chain of 4 RFCs, each formally replacing the one before it.

  1. RFC 4952 (2007)
  2. RFC 5504 (2009)
  3. RFC 5825 (2010)
  4. RFC 6530 (2012) ✓

Read the full history of Overview and Framework for Internationalized Email →

Referenced by

One later RFC formally updates or obsoletes part of this document.

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

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canonical URL: /rfc/5504-downgrading-mechanism-for-email-address-internationalization