Html email being encoded as quoted-printable

[eluser]StlTemplar[/eluser]
G'day, im using the following code to send email

Code:

$html = "&lt;html&gt;&lt;body class='something'&gt;<p id='test'>Testing 123</p>&lt;/body&gt;&lt;html&gt;";

$this->load->library('email');
$this->email->initialize(array(
    'protocol' => 'sendmail',
    'mailtype' => 'html',
    'charset' =>'utf-8',
    'wordwrap' => FALSE,
));
$this->email->from('[email protected]');
$this->email->to($email_address);
$this->email->subject('Test subject');
$this->email->message($html);
$this->email->set_alt_message('Alternate Text');
$this->email->send();

The output of the email debugger is

User-Agent: CodeIgniter
Date: Tue, 31 Jul 2007 22:10:42 -0700
From: "XXX"
Return-Path:
To: XXX
Cc: XXX
Subject: XXX
Reply-To: "XXX"
X-Sender: XXX
X-Mailer: CodeIgniter
X-Priority: 3 (Normal)
Message-ID: <[email protected]>
Mime-Version: 1.0


Content-Type: multipart/alternative; boundary="B_ALT_46b015d2830f7"
This is a multi-part message in MIME format.
Your email application may not support this format.

--B_ALT_46b015d2830f7
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

Alternate text


--B_ALT_46b015d2830f7
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable

&lt;html&gt;&lt;body class=3D'something'&gt;<p id=3D'test'>Testing 123</p>&lt;/body&gt;&lt;html&gt;

--B_ALT_46b015d2830f7--

The problem is the html is being encoded as quoted-printable, which is messing up the html, is this an issue with Codeigniter, or with PHP ?

I have tried using mail, sendmail, and smtp to send email, with the same results.

Is there a way to force the encoding to not be quoted-printable ?

Thanks