Is there a way to see if an email I sent actually went through?

Hi there, @aspenmerk.

You can check the history of your invoice to verify if it was sent to your customer. Let me guide you how.

In your QuickBooks Desktop (QBDT):

1. Go to the Customers menu.
2. Click the Customer Center.
3. Select the appropriate customer.
4. Double click the invoice to open it.
5. Click the See History link to see the status of the invoice.

    

I got you this article for more details: Verify that an invoice was emailed and read by recipient.

You can also contact your customer and verify if they receive the invoice you sent to them. Also, I encourage you to check this resource if you want to give a unique look to your invoice: Use and customize form templates.

Do leave a comment below if there's anything I can help you with. I'd be ready to help you anytime.