Microsoft 365 Administrator Expert MS-102 Practice Question
You administer Microsoft Defender for Office 365. The built-in Safe Attachments policy is set to its default values (Block mode, lowest priority). You create a second Safe Attachments policy that:
Uses Dynamic Delivery mode
Is scoped to a mail-enabled security group named "Finance"
Has priority 0. A user who belongs to the Finance group receives an email that contains a malicious attachment. What will the recipient experience when the message reaches their mailbox?
The message body is delivered immediately; the attachment is replaced by a placeholder and is never released to the user because the file is detected as malicious.
The entire message is delivered immediately, and the attachment is available because Dynamic Delivery bypasses scanning for the Finance group.
The message and attachment are delivered after scanning completes, causing a delay that is visible to the user.
The message does not appear in the mailbox; both the message and its attachment are quarantined because the built-in Block policy is applied.
Safe Attachments policies are processed in order of priority (0 is evaluated first). Because the Finance user is in the scope of the custom policy that has priority 0, that policy is applied instead of the built-in policy. In Dynamic Delivery mode the message body is delivered immediately, but each attachment is replaced by a placeholder until the file is scanned. If the attachment is determined to be malicious, the placeholder is removed and the user never gains access to the file; the message body remains in the mailbox. The built-in policy set to Block mode is ignored because it has lower priority.
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What is Dynamic Delivery in Microsoft Defender for Office 365?
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How do Safe Attachments policies prioritize scanning in Microsoft Defender for Office 365?
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What happens to malicious attachments in Microsoft Defender for Office 365 if Dynamic Delivery mode is applied?
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Microsoft 365 Administrator Expert MS-102
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