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List:       ietf
Subject:    Re: [idn] Re: 7 bits forever!
From:       claus () faerber ! muc ! de (=?ISO-8859-1?Q?Claus_F=E4rber?=)
Date:       2002-04-11 0:15:00
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Dan Kohn <dan@dankohn.com> schrieb/wrote:
> I believe that Einar could be most easily satisfied with something along
> the lines of a UTF8HEADERS ESMTP extension, which would specify both
> that 8 bit character are permitted in the header and that those
> characters MUST be interpreted as UTF-8.  It would be expected that this
> extension would normally be used in conjunction with 8BITMIME [1] or
> BINARYMIME [2].  The challenge is that any mail relay implementing this
> extension MUST be able to downconvert headers to 7-bit RFC 2047 [3]
> compliant encoded words if the next hop does not support UTF8HEADERS.

To encode headers using the methods described in RFC 2047, you
need to know the exact structure of the header. This is impossible  
for future headers.

Claus
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