When a customer places an order via your online store, they receive a copy of the invoice and you can receive a copy as a notification email.
To configure these email addresses, go to Settings > Commerce > Invoicing.
Under "Notifications", two options exist:
Admin Notification E-mails
You can enter your email address to receive notifications in this field.
'From Address' for E-mails Sent to Customers
This is the address that recipients see as the sender / reply address.