Re: [EAI] "7. Upgrading downgraded header" (Re: I-D ACTION:draft-ietf-eai-downgrade-03.txt)

["Charles Lindsey" <chl at clerew.man.ac.uk>]

On Fri, 09 Mar 2007 05:18:25 -0000, Kari Hurtta  
<hurtta+gmane at siilo.fmi.fi> wrote:

> Internet-Drafts at ietf.org writes in gmane.ietf.ima:
>
> > A New Internet-Draft is available from the on-line Internet-Drafts
> > directories.
> > This draft is a work item of the Email Address Internationalization  
> > Working Group of the IETF.
> >
> > 	Title		: Downgrading mechanism for Email Address Internationalization
> > 	Author(s)	: Y. Yoneya, K. Fujiwara
> > 	Filename	: draft-ietf-eai-downgrade-03.txt
> > 	Pages		: 18
> > 	Date		: 2007-3-8
> > 	
> > Traditional mail systems handle only US-ASCII characters in SMTP
> >    envelope and mail header fields.  The Email Address
> >    Internationalization is implemented by allowing UTF-8 characters in
> >    SMTP envelope and mail header fields (UTF8SMTP).  To deliver Non-
> >    ASCII mail address via UTF8SMTP non-compliant environment, some sort
> >    of converting mechanism (i.e. downgrading) is required.  This
> >    document describes requirements for downgrading, SMTP downgrading,
> >    Email header downgrading and implementation consideration.
>
> | o  If each mail header has [RFC2047] encoded part and which encoding
> |      is "UTF-8", it may be a downgraded header, so decode it.
>
> That algorithm not necessary produce original result.

What differences can arise? I can see that folding may get changed, and  
whitespace may get mucked about, but is there anything else?

Changes of folding should be acceptable (and will even lead to correct  
DKIM signature interpretation is the 'relaxed' canonicalization is used).

--
Charles H. Lindsey ---------At Home, doing my own thing------------------------
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   Web: http://www.cs.man.ac.uk/~chl
Email: chl at clerew.man.ac.uk      Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K.
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