controller.php

// CONTROLLER

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Controllername extends CI_Controller {


    public function index()
    {
        if (!empty($_POST)) {
            $this->load->helper('emailsender');
            if (contact_email($this->input->post())) {
                die('your email was sent');
            } else {
                die('there was a problem sending your email');
            }
        }
    }

}

emailsender_helper.php

// HELPER

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

if ( ! function_exists('contact_email')) {

    function contact_email( $data = array()) {
        //Load the ci instance
        $CI =& get_instance();
        $CI->load->library('email');

        $CI->email->from('[email protected]', 'Name');
        $CI->email->to($data['email']);

        $CI->email->subject($data['subject']);
        $CI->email->message($data['message']);
        
        if ($CI->email->send()) {
            return TRUE;
        } else {
            return FALSE;
        }
        
    }

}