In order to achieve this, just follow the steps below through Drupal's User Interface:
1. Clone the enabled checkout completion rule "Send an order notification e-mail" through Home » Administration » Store » Configuration » Checkout settings » Checkout rules (admin/commerce/config/checkout/rules)
2. Set the name "Send an order notification e-mail to site admin" to your new checkout rule and save your changes
3. Edit the new "Send mail" Action
4. Change the e-mail address where the message will be sent to, with the Data selector "site:mail" and save your changes
Note that in this step, you have always the option to change also the Subject and Message body of this email with any text or replacement pattern for Site information or Completed order.
5. Finally, you will be able to see your new checkout rule
In case this article leaves any of your questions or concerns unanswered, please feel welcome to email us or post a public question.
More than (just) Themes
http://www.morethanthemes.com/