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

Originally posted by Microsoft May 16, 2022 Microsoft 365 suite 0 Comments

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 mid-June and completion of the rollout by 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. 

• Configure anti-malware policy
• Configure custom file types using power shell command

Message ID: MC379407