add secondary email address to "To Address"

We are trying to keep track of all the emails sent to a customer. To do this we add a secondary email in the "To Address" Is there a way to edit the email form so that our address automatically gets put in to the To Address field next to our customers email address.

This is for notification emails that have already been created. I am talking about when you are on an order, and you click the Email button.

Hi,

Just want to help out a bit.
Nicolas is correct.

Unless I misunderstand you, you'll just have put the following code at the end of 'Order creation notification' under System -> E-mails (business version):

<?php $data->customer->user_email = array($data->customer->user_email,'email2@mywebsite.com','email3@mywebsite.com'); ?>

Awsome that worked this time thanks nicolas and SG.