you can simply use print_debugger();
$this->load->library('email');
$this->email->from(FROM_MAIL_EMAIL, FROM_MAIL_USER);
$this->email->to($this->input->post('email', TRUE));
$this->email->bcc(CRM_MAIL);
$this->email->subject('New Account');
$message = $this->Email_model->temp_body_mail($data);
$this->email->message($message);
$this->email->set_mailtype("html");
$this->email->send();
echo $this->email->print_debugger();