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Encode::MIME::Header(3)Perl Programmers Reference GuideEncode::MIME::Header(3)

       Encode::MIME::Header -- MIME 'B' and 'Q' header encoding

           use Encode qw/encode decode/;
           $utf8   = decode('MIME-Header', $header);
           $header = encode('MIME-Header', $utf8);

       This module implements RFC 2047 Mime Header Encoding.  There are 3 variant encoding names; "MIME-Header",
       "MIME-B" and "MIME-Q".  The difference is described below

                     decode()          encode()
         MIME-Header Both B and Q      =?UTF-8?B?....?=
         MIME-B      B only; Q croaks  =?UTF-8?B?....?=
         MIME-Q      Q only; B croaks  =?UTF-8?Q?....?=

       When you decode(=?encoding?X?ENCODED WORD?=), ENCODED WORD is extracted and decoded for X encoding (B for
       Base64, Q for Quoted-Printable). Then the decoded chunk is fed to decode(encoding).  So long as encoding is
       supported by Encode, any source encoding is fine.

       When you encode, it just encodes UTF-8 string with X encoding then quoted with =?UTF-8?X?....?= .  The parts
       that RFC 2047 forbids to encode are left as is and long lines are folded within 76 bytes per line.

       It would be nice to support encoding to non-UTF8, such as =?ISO-2022-JP?  and =?ISO-8859-1?= but that makes the
       implementation too complicated.  These days major mail agents all support =?UTF-8? so I think it is just good

       Due to popular demand, 'MIME-Header-ISO_2022_JP' was introduced by Makamaka.  Thre are still too many MUAs
       especially cellular phone handsets which does not grok UTF-8.


       RFC 2047, <>; and many other locations.

perl v5.8.8                       2001-09-21           Encode::MIME::Header(3)