Email Class

[eluser]gedev2006[/eluser]
hI

This is in the CI documents for the email class
$this->load->library('email');

$this->email->from('[email protected]', 'Your Name');
$this->email->to('[email protected]');
$this->email->cc('[email protected]');
$this->email->bcc('[email protected]');

$this->email->subject('Email Test');
$this->email->message('Testing the email class.');

$this->email->send();

how do i actually add custom headers to the email?