How do I see all emails sent to clients? How do I know if my invoice has been sent?

You can go to the All Sales page to see the status of the invoice, msperformance01.

You'll want to customize this page to filter transactions to invoices. I'll guide you how.

1. From the Sales menu, choose the All Sales tab.
2. Click on the Filter drop-down arrow, choose Invoices as the Type and select All statuses under Status.
3. Select Apply.

Please see attached screenshot.

In case you want to learn how to receive and categorise invoice payments in QuickBooks Online (QBO), check out this article: Record invoice payments in QuickBooks Online.

We'll be around to help if you need anything else. Have a good one.