perl -E 'use open qw(:std :utf8);
           use Encode;
           say Encode::decode("MIME-Header", "Subject: Re: =?gbk?Q?=C3=C9=B9=C5=CF=EE=C4=BF=D0=CD=D6=C6=D7=F7=B7=BD=B0=B8?=");'