This audit log has the same problem that the warnings I would get sometimes in my QBO dashboard. I would send an invoice to two or three addressees (one or two for the client and a cc or bcc to myself) and I would get an notice that is "Undelivered" but it didn't tell me which addressee was undelivered. Then I would see that the customer had viewed the invoice, and then PAID the invoice, so I had assumed that the warning was a false alarm. This went on for a few months and I even submitted a ticket about these "false alarms" in my dashboard, until I realized around May or June that I had not been receiving my copies coming back to a special mailbox that I had set up for my copies since January? Only the special test messages I had sent to my fictitious customer or times that I had manually inserted my personal email in place of the customer's email address did I receive a copy in my Smart mailbox set up to receive my invoice copies.