We can set up a unique email address for forwarding receipts in the Manage settings, located under the Receipts tab.
Here's how:
Head to the Accounting tab, then Receipts.
Go to Manage settings.
Click Edit email.
Put your customized name with unique characters.
Click Confirm once done.
To automatically send bills and receipts in QuickBooks, follow the steps in this article on how to set up Gmail auto-forwarding to your created QuickBooks email address: Email receipts and bills.
If you need further assistance, please don't hesitate to ask.