Hi there, sportscarshop,

Thanks for joining the thread. Let me help share addtional information about emailing invoices in QuickBooks Online (QBO).

Once an invoice is sent, the system will recognize that it has been viewed by the customer. The statuses are changed automatically once the customer received and opened the said invoices. You'll see it under the Invoices page. It will show as Viewed in the STATUS column .

To check the status of invoices sent via email on your QBO account, here’s what you'll need to do:

1. Click Sales in the left navigation panel.
2. Select Customers.
3. Choose the name of the customer you want to view.
4. Open the invoice and go to the Activities section found at the lower part of the invoice.

Moreover, you can also use the Audit log to check the activity history of all transactions.

For additional information I'm attaching some helpful articles you can check:

• Use e-Invoice
• How to view transaction changes in the audit history
• The Audit Log: What it is, how to use it

If you have any other questions about invoices, please let me know. I'm always here to help. Have a great day!