Hello there, @homeworks.
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.