Mailgun for WP Multisite

wp-config.php

<?php
// Ref: https://guides.wp-bullet.com/how-to-use-mailgun-with-wordpress-multisite-http-api-or-smtp/

//Mailgun multisite stuff
define('MAILGUN_USEAPI', true);
define('MAILGUN_APIKEY', 'key-YourAPIKeyHere');
define('MAILGUN_DOMAIN', 'mg.youdomain.com' );
define('MAILGUN_SECURE', true);

// Set the from name and from address
define('MAILGUN_FROM_NAME', 'No-Reply');
define('MAILGUN_FROM_ADDRESS', 'noreply@webtodlong.com');