Hello, @Anonymous.

Thanks for the prompt response. Allow me to add to this discussion and share some information about emailed invoices. 

For now, you can only see if someone viewed the invoice you sent. The option for the system to indicate a specific person is currently unavailable. I’ll personally update the thread for any information or changes related to this.

In the meantime, you can visit our QuickBooks Online Blog to know more about our latest happenings. From there, you’ll get the recent news, features, and updates about QBO and what our Product Team is working on.

I'm also adding our help link for future reference: QBO Self-help.

That should do it. Reach out to me if you have any other concerns, I’m always here to assist you. Wishing you and your business continued success!