CentOS 7.0 - man page for encode::mime::header (centos section 3)
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Encode::MIME::Header(3) User Contributed Perl Documentation Encode::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
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
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 enough.
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, <http://www.faqs.org/rfcs/rfc2047.html> and many other locations.
perl v5.16.3 2013-04-29 Encode::MIME::Header(3)
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