Welcome to the Community, -wwcairns-com-au.
Let me guide you on how to remove the other email address in getting the invoice copy sent from your QuickBooks Online account. Here's how to:
Once done, let's try sending a dummy invoice and verify if the other email address no longer shows or receive the invoice sent from QBO.
If you have more questions about QuickBooks Online, feel free to post a comment below. I'll get back to you as soon as I can.
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