Add Email Link to Order Email

[bluecivic21]

I tried to add a email link to the checkout_process.php file but for some reason I can't get it right. I can add the basic email text ENTRY_EMAIL_ADDRESS . $order->customer['email_address'] ."\n\n" and that work fine. How do I add a clickable link like what in /admin/orders.php echo '<a href="mailto:' . $order->customer['email_address'] . '"><u>' . $order->customer['email_address'] . '</u></a>' "\n\n"; If I try to add that code I get a Echo Error and is is possible to change the reply address in the order email to the customers email?