quoted printable decode

Not installed:

=?ISO-8859-1?Q

broken,

Gagosian Gallery : DîâCRé 1999.2000
Subject: : =?UTF-8?Q?Gagosian=20Gallery=20?==?UTF-8?Q?:=20D=C3=83?= =?UTF-8?Q?=C2=AE=C3=83=C2=A2CR=C3=83=C2=A9=201999.200?==?UTF-8?Q?0?=

FIX

$preferences = array(
                "input-charset" => "UTF-8",
                "output-charset" => "ISO-8859-1",
                "line-length" => 76,
                "line-break-chars" => "\n"
            );
            $preferences["scheme"] = "Q";
            $encoded = iconv_mime_encode("Subject", $email->subject, $preferences);

Reference:

• iconv-mime-encode
• Quoted-printable
• Stack Overflow