Can you send the payment notification to a different email address and not the email from the customer record?

If a customer record in Sage has an email address saved, then receipts will go to that email address, and the one entered in the checkout. If both email addresses are the same, ensure that the receipt isn’t sent twice to the same email address. If no email address is saved on the customer record, the receipt will only go to the email address entered in the checkout.