created several invoices, QuickBooks has a print and email features which helps you to print or send the documents your customer via mail.
To Print an multiple invoice:
Click on the file menu, select print forms and click invoice
Use this window to select the customers' invoice you want to print
Preview the multiple customers' invoice and click OK
To Email an Invoice
When you create an invoice, on the invoice window, click Email
Enter the customer's email address - if they are more than one, separate by comma
Click Ok to send the invoice by email.