Thanks for joining us here, @Michelle52.

We're unable to print customer's address directly on an envelope. I highly recommend checking third party apps that integrate with QuickBooks.

Also, you may want to consider creating custom fields in QuickBooks. This way, you'll be able to capture specific customer, vendor, employee, product, and service details. 

You're always welcome to drop by if you have any other QuickBooks questions. I'll be around to help.