Yes, an email address of a second/superuser can be set, and be included as a carbon copy of all outbound Purchase Orders.
Please follow the below steps to enable this feature:
From [Dashboard], go to [System] [Purchasers].
On the right-hand side of the screen, click on the [Business Settings] tab.
In the field that says 'PO copy email(s)', type in the email address that is required to receive a copy of the Purchase Order, and press 'Enter' on the keyboard. The changes are now saved.
Please note, if this field is left blank, the requestor of the Purchase Order and the Supplier will receive a copy of the document.