Downgrading mechanism for Internationalized eMail Address (IMA)

Document Type Expired Internet-Draft (individual)
Authors Yoshiro Yoneya  , Kazunori Fujiwara 
Last updated 2006-03-09
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Traditional mail system handles only US-ASCII characters in SMTP envelope and mail headers. The Internationalized eMail Address (IMA) is implemented by allowing UTF-8 characters in SMTP envelope and mail headers. To deliver IMA through IMA incompliant environment, some sort of converting mechanism (i.e. downgrading) is required. This document describes requirements for downgrading, SMTP session downgrade, header downgrade and implementation consideration.


Yoshiro Yoneya (
Kazunori Fujiwara (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)