Mail.php

<?php
namespace App;

use Mailgun\Mailgun;

/* Mail class */
class Mail {

    /**
     * METHOD, send
     * @param string     : $to = recipient
     * @param string     : $subject
     * @param string     : $text (core msg)
     * @param string     : $html HTML content of the message
     * @return mixed     :
     */
    public static function send($to,$subject,$text,$html) {
        
        $mailgun = Mailgun::create(Config::MAILGUN_API_KEY);//private API key
        $domain = Config::MAILGUN_DOMAIN;

        if (\App\Config::MAILGUN_TEST_STATUS===true) {
            $to = \App\Config::MAILGUN_TEST_EMAIL;
        }

        //Compose and send message
        $mailgun->messages()->send($domain,array(
            'from'=>'bob@example.com',
            'to'=>$to,
            'subject'=>$subject,
            'text'=>$text,
            'html'=>$html
        ));
    }
}
?>