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July 26, 2022

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(Updated) Exchange Online Protection: Anti-malware policy notification settings change

Exchange Online, Microsoft 365 Suite, Microsoft 365 Experts

From Microsoft Corporation
Technical Bulletin MC360646 · Published Apr 18, 2022 · Last updated Jun 14, 2022

Message Summary

Updated June 14, 2022: We have updated this message to ensure visibility for affected organizations. Thank you for your patience.

The previous Message Center post MC303513 (Dec ’21) mentioned that we’re planning to retire the recipient and sender notification configuration in anti-malware policies. After reviewing customer feedback, we’re changing how we’re planning to retire those recipient and sender notifications.

The current notification settings are commonly used for messages that are blocked/quarantined as detected malware, or due to a file attachment in the common attachment filter settings.

As part of this change, we’re separating out the handling of notifications based on whether the message was scanned and found to be malicious vs. matches from the common attachment filter: 

  • True malware: Both recipient and sender notifications will be retired. The message will be quarantined, and the selected quarantine policy configuration determines whether to send the end-user notifications. There is no option for sender notification.
  • Common attachment filter: Notifications are split into two distinct options that the admin can choose (one or the other):
    •  Recipient notifications only: As with true malware detections, the selected quarantine policy configuration determines whether to send end-user notifications. There is no option for sender notifications.
    •  Non delivery report (also known as NDR or bounce message)) to sender: The message is rejected in an NDR to the sender. The message is not quarantined, is not recoverable, and there’s no option for recipient notifications.

This message is associated with Microsoft 365 Roadmap ID 93212

When this will happen:

Starting late June (previously early June) and completion of deployment by late July (previously late June)

How this will affect your organization:

Once these changes are rolled out, the current email notifications for recipients and senders will be stopped. Instead, any recipient notifications will be based on the selected quarantine policy (dropdown in the anti-malware policy).

What you need to do to prepare:

Review the ‘Quarantine Policy’ selection in your current anti-malware policies. With this feature change, for default and all existing policies,

  • The selection in the ‘Quarantine Policy’ dropdown will be used for any recipient notifications.
  • For the new settings in ‘Common attachment filter detections’, the selection will be set to ‘Quarantine the message’ option (which is the same as the Quarantine policy dropdown).

Review the following resources below to learn more:

Additional information


QuixTec provides this and other technical bulletins unaltered from Microsoft. As an authorized Microsoft Partner, we ensure that all our solutions we deliver to you include the latest Microsoft updates.

ABOUT US: QuixTec, LLC is a U.S. certified Veteran Owned, modern DevOps organization with experience in a plethora of IT Software Languages.  As a Microsoft Partner, we specialize in Discounted Microsoft Software Licensing, Microsoft SharePoint, Microsoft365 and HTML5 technologies for small to enterprise-sized organizations. Our dedication to IT excellence is evidenced through our PECB ISO Certification training center. The only PECB ISO authorized center in Washington State. QuixTec, implements and provides training for upcoming open-source digital marketing services that are taking the industry by storm. This solution, used by over 100,000 businesses, provides enterprise level marketing capabilities at startup rates. The founder, Richard, has 30 years of experience working with several notable companies that include World Vision, Expedia, Microsoft, Levi Strauss, NASA, Boeing Aerospace, Los Alamos National Laboratory, and the U.S. Air Force, to name a few.  QuixTec is in the Seattle area. Phone today for a free consultation and project estimate.

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