我有：
mb_send_mail(): Unsupported transfer encoding "quoted-printable" - will be regarded as 8bit
我该怎么办？
完整的标题：
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=utf-8
MIME-Version: 1.0
Date: Thu, 17 Mar 2011 19:17:48 +0200
Message-ID: <1300382268.4d82423c6c409@mydomain.com>
From: noreply@mydomain.com
Subject: =?utf-8?Q?=D0=9D=D0=BE=D0=B2=D1=8B=D0=B9_=D0=BA=D0=BE?=
=?utf-8?Q?=D0=BC=D0=BC=D0=B5=D0=BD=D1=82=D0=B0=D1=80?=
=?utf-8?Q?=D0=B8=D0=B9_=D0=BA_=D0=B2=D0=B0=D1=88?=
=?utf-8?Q?=D0=B5=D0=B9_=D1=84=D0=BE=D1=82=D0=BE=D0=B3?=
=?utf-8?Q?=D1=80=D0=B0=D1=84=D0=B8=D0=B8?=
To: some@email.com