Is there a way to track an email that has been sent via Books with an invoice?

Is there a way to track an email that has been sent via Books with an invoice?

Is there a way to track an email that has been sent via Books with an invoice?
We have a client who claims they have never received an invoice from us but we know it was created and sent, we just can't prove it. We have since turned on the tracking function in Books but this doesn't help with the email we are trying to chase.

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