Good day, cfk3.

Let me share some details about this invoice delivery issue in QuickBooks Online (QBO).

To remove it from the spam list, I suggest contacting an IT expert. They can guide you further to ensure you can successfully unblocked POS and Invoices in QuickBooks. 

You'll also want to personalize the appearance by adding specific info to your sales forms in QBO. Check out this article for more information: Customize invoices, estimates, and sales receipts in QuickBooks Online.

I'm here whenever you need help with managing your invoices in QuickBooks. Take care always!