I've requested this several times before, but I'm not seeing this listed as an idea or bug. The history needs to show on the invoice to show 1. what date/who the invoice was emailed to, 2. what date/who the invoice was sent a 2nd, 3rd, etc time. 3. if the email does not go through, that should show on the history with an email to the merchant that the email address was invalid. The history on invoices used to show so that a merchant could know who/when they sent the invoice to if there has been a problem in collecting. Without this history, the merchant does not know if it was sent multiple times and who it was sent to.