Mastering Office 365 Administration

Safe attachments

Recently, Microsoft extended the Safe Attachments policies to SharePoint, OneDrive, and Microsoft Teams. You can activate the policy for all of those products by clicking the box labeled Turn on ATP protection for SharePoint, OneDrive, and Microsoft Teams.

For policies that pertain to email accounts, you must first create a policy. There isn't one by default, the way there is in other areas:

New safe attachments policy

Choose the actions to take if the system identifies unknown malware in an attachment:

• Off: The attachments aren't scanned for malware at all.
• Monitor: The message will be delivered after malware is detected. ...