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Written by Brad

August 11, 2022

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(Updated) Exchange Online-Add, edit custom file types in Anti-malware policy

Exchange Online, Microsoft 365 Suite, Microsoft 365 Experts

From Microsoft Corporation
Technical Bulletin MC379407 · Published May 13, 2022 · Last updated Jul 18, 2022

Message Summary

Updated July 18, 2022: We have updated the rollout timeline below. Thank you for your patience.

In anti-malware policies, the common attachment filter allows you to select specific file types to block. Any email messages with these types of file attachment will be handled as per the policy settings. In addition to turning on the common attachment filter, you can customize the list of file types, but only by using the Set-MalwareFilterPolicy cmdlet in Exchange Online PowerShell.

We’re enhancing the anti-malware policy experience of anti-malware policy by adding the ability to view/add/remove custom file types in the anti-malware policy settings in the Microsoft 365 Defender portal.

This message is associated with Microsoft 365 Roadmap ID 85611

When this will happen:

Starting in late July (previously early July) and completion of the rollout by mid-August (previously late July).

How this will affect your organization:

Once these changes are rolled out, you can view/add/delete file types (extensions) for the common attachment filter in the anti-malware policy settings in the Microsoft 365 Defender portal. 



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