If you use Office365 for email, check your Clutter folder. It might contain messages you want.
UC Davis uses Office365, provided by Microsoft, as the email service for most faculty and staff campus email accounts. Last year Microsoft added Clutter to Office365, to help people filter and set aside low-priority email. You can find your Clutter folder in your list of email folders, near the "junk suspects" and "quarantine" folders.
Microsoft explains it this way: