If you have subscribed to receive extra order email for quick and easy referencing of purchases made, you would have certainly missed the customer's contact info. This recipe adds your customers' email addresses and phone numbers under their billing address. The data used is pulled from the customers table where some of the information that your customers enter during registration is saved.
Your Order Confirmation email will look like this:
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$email_order .= "\n" . EMAIL_TEXT_BILLING_ADDRESS . "\n" .
EMAIL_SEPARATOR . "\n" .
tep_address_label($customer_id, $billto, 0, '', "\n") . "\n\n";
Replace it with the following code, adding your customer...