Got one that even I'm a little stumped on (software engineer). Wife noted that she can't see all of her e-mails in Gmail, was missing an important e-mail from stepson's school. Finally found the missing e-mail by searching for the sender, saw what date it was sent and it was in her inbox. She has no filters turned on, no forwarding, and no blocked addresses, but it was supposedly in her inbox. Scrolled down to the date range, but it just doesn't show. Was a legit e-mail from the school principal. Any ideas on why it won't show? Wasn't flagged as spam, or routed to junk mail. Googling just turns up "turn off filters", but she has no filters.