Hi there, @sheppan.
I can see how convenient it is to scan and email your QBO receipts directly from your printer to a destination.
From what I've learned, you'll need to configure a Simple Mail Transfer Protocol (SMTP) authentication on your printer to set up your name as an authorized user.
Since this type of concern is beyond my scope of support, I'd recommend contacting RICOH customer service for further assistance. They can guide you with this procedure.
I've got you some pointers that you can bookmark for your future references:
Feel free to post again if you have more questions about sending the QBO receipts feature. I'm always around to be your guide.