Subject: Re: [EAI] Re: "6. Email header Downgrading"

From: [email-masked]
Date: Tue, 03 Apr 2007 16:17:57 +0900 (JST)

Sorry for my too late responses.

> From: Kari Hurtta <[email-masked]>
> > > |   other headers:
> > > |      All other headers which contains UTF-8 characters are preserved in
> > > |      Downgraded: header and removed.
> > >
> > > Removing of MIME's  Content-Type -header field produces incorrect result.
> > >
> > > Basically mime-type part (type/subtype) of that header-field must be
> > > preserved.
> > > Also following mime paramaters need to be preserved: charset and boundary
> > > These parameter values should be ASCII -only.  Also type/subtype value
> > > should be ASCII -only.
> > 
> > Which just leaves possible <parameter>s with UTF-8 in theor
> > <value>s. We  should define that these are to be downgraded using RFC
> > 2231.

I'll fix this part after utf8header document fix.

If all MIME headers are allowed to contain raw UTF-8 string, all MIME
headers in both mail header fields and MIME bory part headers (at
least outer-most MIME structure) MUST be downgraded using RFC 2231.
Downgrading process MUST parse whole body part if the mail has the
multipart MIME structure.

> And do not forget comments.
> 
> draft-ietf-eai-utf8headers-03.txt:
> 
> |   comment = "(" *([FWS] utf8-ccontent) [FWS] ")"
> |
> |   word    = utf8-atom / utf8-quoted-string
> |
> |   This means that all the RFC 2822 constructs that build upon these
> |   will permit UTF-8 characters, including comments and quoted strings.

It is written in section 6 and 6.1.
But it needs detailed description.

--
Kazunori Fujiwara, JPRS

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