Yes they can. When you create a new customer or edit an existing customer's details, you will see a field to add a secondary email address.
Secondary email addresses are sent a copy of the same information sent to the primary email address such as order updates and payment requests.
Please see Can I set up a company or organisation as a customer? for more information. It can be very useful for teams that need to share booking information with a number of different people e.g. club secretary and team manager.