html email still sending as text/plain

[eluser]doubleplusgood[/eluser]
Hi there,

I have a controller that sends an email. But the email received always comes through as Content-Type: text/plain; charset=utf-8, even though I have the controller and config set to send html email as follows;

Code:

$this->load->library('email');
$config['mailtype'] = 'html';
$config['charset'] = 'utf-8';
$config['newline'] = "\r\n";

$this->email->initialize($config);

Anyone else had this problem? :S