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Messages that contain malicious attachments are quarantined. Notifies recipients that attachments have been removed. This is the default value, and the recommended value in Standard and Strict preset security policies. Protects your organization from repeated attacks using the same malware attachments. *Īutomatically blocks future instances of the messages and attachments. By default, only admins (not users) can review, release, or delete the messages. Prevents messages with detected malware attachments from being delivered. See where detected malware goes in your organization. You should only use this option to turn off Safe Attachments scanning for recipients who only receive messages from trusted senders.ĭelivers messages with attachments and then tracks what happens with detected malware.ĭelivery of safe messages might be delayed due to Safe Attachments scanning. This option is not recommended for most users. Prevent unnecessary delays in routing internal mail. Turn scanning off for selected recipients. Messages are still scanned for malware by anti-malware protection in EOP. The available options are described in the following table:Īttachments aren't scanned for malware by Safe Attachments. Safe Attachments unknown malware response: This setting controls the action for Safe Attachments malware scanning in email messages. This section describes the settings in Safe Attachments policies:

Safe Attachments for SharePoint, OneDrive, and Microsoft Teams.

But, these settings are enabled or disabled globally, and don't require Safe Attachments policies: The following features are located in the global settings of Safe Attachments policies in the Microsoft 365 Defender portal. For more information about datacenter geography, see Where is your data located? Safe Attachments scanning takes place in the same region where your Microsoft 365 data resides. If the external recipients also have Safe Attachments policies in their organization, then the forwarded messages are subject to those policies. Chris receives an email that has an attachment, and then forwards the message to external recipients. Typically, it takes about 30 minutes for a new policy to take effect.Ĭhris's organization has long-standing Safe Attachments policies for everyone in the organization. Earlier today, Jean received an email message that included an attachment. Yesterday, an admin in Jean's organization created a Safe Attachments policy that applies to all employees. Lee is not protected by Safe Attachments.įinance employees are protected by Safe Attachments, but sales employees (and other employees) are not. Lee's organization has a Safe Attachments policy that applies only to finance employees. Furthermore, the conditions of the policy must include Pat if Pat is to be protected by Safe Attachments. Pat is not protected by Safe Attachments.Īn admin must create at least one Safe Attachments policy for Safe Attachments protection to be active. Pat's Microsoft 365 E5 organization has no Safe Attachments policies configured.

The following table describes scenarios for Safe Attachments in Microsoft 365 and Office 365 organizations that include Microsoft Defender for Office 365 (in other words, lack of licensing is never an issue in the examples).

For instructions, see Set up Safe Attachments policies in Defender for Office 365. There is no default Safe Attachments policy, so to get the protection of Safe Attachments, you need to create one or more Safe Attachments policies. Safe Attachments protection for email messages is controlled by Safe Attachments policies. Specifically, Safe Attachments uses a virtual environment to check attachments in email messages before they're delivered to recipients (a process known as detonation). Safe Attachments in Microsoft Defender for Office 365 provides an additional layer of protection for email attachments that have already been scanned by anti-malware protection in Exchange Online Protection (EOP). Microsoft Defender for Office 365 plan 1 and plan 2.This new experience brings Defender for Endpoint, Defender for Office 365, Microsoft 365 Defender, and more into the Microsoft 365 security center. The improved Microsoft 365 Defender portal is now available.