easyappointments/src/application/config/email.php

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

// Add custom values by settings them to the $config array.
// Example: $config['smtp_host'] = 'smtp.gmail.com'; 
// @link https://codeigniter.com/user_guide/libraries/email.html

$config['useragent'] = 'Easy!Appointments'; 
$config['protocol'] = 'smtp'; 
$config['mailtype'] = 'html';
$config['smtp_host'] = 'smtp.gmail.com';
$config['smtp_user'] = 'johndoe.atdev@gmail.com'; 
$config['smtp_pass'] = 'aPCiALxAgrpwG9RgcqxN';
$config['smtp_crypto'] = 'ssl';
$config['smtp_port'] = 465;