Sending Email Not Working

[eluser]renga[/eluser]
if ($this->form_validation->run() == FALSE) {

$this->load->view('register.tpl', $data);
}
else {
$this->load->model('registration_model');
$chk_register = $this->registration_model->register($_POST);
if($chk_register == true) {

$this->load->library('email');
$config['protocol'] = 'sendmail';
$config['mailpath'] = '/usr/sbin/sendmail';
$config['charset'] = 'iso-8859-1';
$config['wordwrap'] = TRUE;
$this->email->initialize($config);

$this->email->from('[email protected]', 'Enexions');
$this->email->to('E_mail');
$this->email->subject('Email Test');
$this->email->message('Testing the email class.');
$this->email->send();
echo $this->email->print_debugger();
$data['Success'] = "Account Activated Successfully !";
$this->load->view('register.tpl', $data);
}
else {
redirect('/register','refresh');
}
}