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From: kyle_jones@wonderworks.com (Kyle Jones)
Newsgroups: gnu.emacs.vm.info
Subject: Re: mail-extract-address-components doesn't handle MIME-encoded full names
Date: Fri, 9 May 2003 02:21:24 +0000 (UTC)
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Kevin Rodgers  <ihs_4664@yahoo.com> wrote:
 > After I submitted a report to gnu.emacs.bug with the same subject, I
 > realized that it's probably better for VM to to decode the From: header
 > contents before calling mail-extract-address-components.

RFC 2047 advises against this because RFC 822 parsing rules are
no longer applicable to headers containing the decoded text.  If
mail-extract-address-components expects RFC 822 syntax (and I
think it does), then it could be broken by direct exposure to
decoded text.  The paragraph in the RFC 2046 I'm referring to is:

   NOTE: Decoding and display of encoded-words occurs *after* a
   structured field body is parsed into tokens.  It is therefore
   possible to hide 'special' characters in encoded-words which, when
   displayed, will be indistinguishable from 'special' characters in the
   surrounding text.  For this and other reasons, it is NOT generally
   possible to translate a message header containing 'encoded-word's to
   an unencoded form which can be parsed by an RFC 822 mail reader.

This is just for your information.  In practice the worse thing
that will happen is that someday mail-extract-address-components
might throw an error unexpectedly.

-- 
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