Hello, @DomCuch.
I can provide you with the correct email about where to forward receipts to QuickBooks.
If you're referring to sending receipts to QuickBooks Online, this option is currently unavailable. However, if you're referring to the receipt forwarding feature in QuickBooks Desktop Self-Employed you can send it through this email: receipts@quickbooks.com.
For more insights about the receipt forwarding feature, please visit this article: Receipt forwarding feature Overview.
I'd also encourage you to submit feedback on how we can improve your QuickBooks Online experience. This will be sent to the Product Development Team for review when determining features to be added in updates. You can do this from within QuickBooks Online by selecting the Gear icon and clicking Feedback or by going to the following link: QuickBooks Online Feature Requests.
This should get you on track.
Please know that the Community has your back if there's anything else you need. Have a great day!