Yes, there is, sunshine0259,

You can simply set up the email address on the customer profile. This way, the information will automatically populate when sending invoices to customers.

Let me show you how:

1. Go to Sales from the left menu, then choose Customers.
2. Locate the customer and click the name to open the profile.
3. Click Edit to open the Customer information window.
4. Enter the address in the Email field, then click Save. 
   
5. When sending an invoice, you'll see the address in the To field.
   

Check out the Send multiple invoices in case you need this process. Also, you can send reminders to customers when their invoices are to be overdue.

Stay in touch with me if there's anything else you need about emailing invoices. I'm always glad to help.