Summary
People can receive Invoice or Work Order emails based on where their email address in the customer's account.
Key Points
The email address in the customer's Billing page receives invoice emails
The email address in the customer's Location page receives work order emails
To have a customer receive both invoice and work order emails, put the same email address in both locations.
Note An email address in the location page will not receive invoice emails, and an email address in the billing page will not receive work order emails.
To add additional email addresses see Contacts - Adding from Customer/Location pages