Thank you for reaching out to the QuickBooks Community! Glad to see you here. Currently, in QuickBooks Desktop, you can add multiple emails, but you can only use one default when sending transactions like invoices, as you mentioned. An alternative would be to use a third-party application that integrates with QuickBooks for a situation like this. You can use the link below to check out our App Store:
Feel free to look at ratings and reviews to find one that suits your needs. I hope you enjoy the rest of your afternoon. Don't hesitate to connect with us if you have further questions.
