Forum Discussion
Junk mail filter
We are having a problem where emails that were once marked safe and have been going to our inbox suddenly end up back in Junk Mail. We go back to the email and mark it safe again and it moves it to t...
This sound like the ZAP feature. Read more about it, how to identify messages affected by it and how to disable it if needed here: https://docs.microsoft.com/en-us/office365/securitycompliance/zero-hour-auto-purge