DragonFly On-Line Manual Pages

FIX-MIME-CHARSET(1)                                        FIX-MIME-CHARSET(1)

NAME
       fix-mime-charset - fix incorrect charset specifications in MIME
       messages

SYNOPSIS
       fix-mime-charset [-BfLm?V] [-c charset] [-I charset,...] [-l language]
       [-O charset,...] [--break-signature] [--charset=charset]
       [--force-override] [--ignore-charsets=charset,...] [--lang=language]
       [--mailbox] [--only-charsets=charset,...] [--show-langs] [--help]
       [--usage] [--version] [file...]

DESCRIPTION
       In non-English mailing lists (particularly in Russian) there is a big
       problem with messages, where charset parameter of Content-Type header
       is set incorrectly.  Sometimes software is buggy, sometimes people
       cannot set up their software properly, sometimes web-based email
       clients do not implement charsets.  While reading such a mail, one
       should manually switch encoding in MUA back and forth.  Incorrectly
       encoded or plain 8-bit Subject field is another big problem.  Such
       fields often get corrupted while passing e-mail gateways.

       This program can be used to solve these problems while used as mail
       filter (in MTA, procmail(1) or similar program).  It tries to detect
       correct charset automatically (currently only Russian language KOI8-R,
       Windows-1251 and UTF-8 charsets are detected) and fixes Content-Type
       and Subject headers of the message or message subpart.  fix-mime-
       charset interprets multipart messages correctly and processes
       text/plain subparts only.  Attachments, other headers and body of the
       message are not touched.  fix-mime-charset correctly interprets quoted-
       printable and base64 transfer-encodings.  Program is written to be very
       fast and use minimal amount of memory.

       When no files are given in command line, the program reads input from
       stdin.  When several files are given, they are concatenated in the
       order of appearance.

OPTIONS
       -B, --break-signature
             Enable fixing charset information in multipart/signed messages.
             Modication of Content-Type field in this case will result in
             broken signature.  You may enable this option if you prefer
             readable text to verifyable signatures.  In any case fix-mime-
             charset will not modify the message if everything is correct.

             By default, multipart/signed messages are leaved untouched.

       -c, --charset=charset
             Charset to be used when it cannot be determined automatically.
             By default, in this case Content-Type field is leaved untouched.
             If Content-Type field is absent, charset given in this option is
             used (us-ascii by default).  This behavior may be overriden by -f
             switch.

       -f, --force-override
             Always override charset of Content-Type field.  By default,
             Content-Type field is leaved untouched if charset cannot be
             determined automatically.  When this option is used, charset
             given by -c option overrides Content-Type field.

       -I, --ignore-charsets=charset,...
             Ignore messages with given charsets. us-ascii charset is assumed
             when charset is not set in Content-Type field. Charsets in list
             may be separated by space, comma, colon or semicolon. This option
             can be repeated several times and lists are joined in this case.

       -l, --lang=language
             Set language for autodetection. language is two-letter ISO
             639:1989 language code. fix-mime-charset -L gives list of all
             available languages and language codes.

             Default language is "ru" (Russian).

       -L, --show-langs
             Gives list of all available languages and language codes.

       -m, --mailbox
             Process input as Unix mailbox ("From " lines are used as message
             delimiters).  Without this option, input is considered to be an
             individual message and messages should be passed to the filter
             one-by-one.

       -O, --only-charsets=charset,...
             Process messages with given charsets only. us-ascii charset is
             assumed when charset is not set in Content-Type field. Charsets
             in list may be separated by space, comma, colon or semicolon.
             This option can be repeated several times and lists are joined in
             this case.

       -?, --help
             Print help message and exit.

       --usage
             Give a short usage message and exit.

       -V, --version
             Print version information and exit.

USAGE WITH PROCMAIL
       Some people asked me for examples of using fix-mime-charset with
       procmail(1). It is very easy - simply insert the following rule into
       .procmailrc:

         :0 f
         | fix-mime-charset

       Filtering rule is non-delivering in terms of procmail(1) and filtered
       mail will be transferred to following rules.

       It is equally easy to filter limited subset of messages:

         :0
         * <your filter here>
           {
           :0 f
           | fix-mime-charset

           <delivering rules here>
           }

AUTHOR
       Dmitry E. Melamud <balu@migdal.ru>

COPYRIGHT
       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2 of the License, or any later
       version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.

SEE ALSO
       procmail(1)

v.0.5.3                           2003-12-13               FIX-MIME-CHARSET(1)