Creating a custom quarantine policy in Microsoft Defender for Office 365 involves configuring advanced threat protection settings to protect your organization’s email environment.

To create a Custom Quarantine Policy in Microsoft Defender for Office 365, you can follow these general steps:

1.Login to the Microsoft Defender portal using your organization’s credentials.

2.Expand the Email & collaboration on the Microsoft Defender page and select Policies & rules.

3.Select Threat policies on the Policies & rules page.

4.Select Quarantine policies on the Rules.


A quarantine policy ties in with Safe Attachments because if an attachment is found to be malicious, it would need to be quarantined.

5.Select Global settings on the Quarantine policy page.

6.The global settings enable us to define a global notification. These settings allow you to customize the notifications sent to recipients of quarantined messages. By configuring quarantine notification settings in Microsoft Defender for Office 365, you can ensure that relevant stakeholders are promptly informed about emails that have been quarantined, facilitating timely action to address potential security threats.

7.Three policies govern the user experience for quarantine messages by default. You can create your custom policy. Click Add custom policy on the Quarantine policy page.

8.On the Policy name page, enter the custom policy name and click Next.

9.Select Set specific access (Advanced) on the Recipient message access page.


If you select Limited access, users can do anything to their quarantined messages except release them from quarantine without admin approval.

10.Select Allow recipients to request a message to be released from quarantine from the Select release action preference drop-down list.


If you use the default blank value, the recipients cannot release or request the release of their messages from quarantine.

11.On the Select additional actions recipients can take on quarantined messages settings, you can select some, all or none of them and click Next.

12.When users receive a quarantine notification, the following information is available for each quarantined message.

13.Select Enable on the Quarantine notification page and click Next.

14.Click Submit on the Review policy page.

15.Ensure the new custom policy is created successfully and click Done.

16.On the Quarantine policy page, the new custom policy shows up.

I hope you enjoy this post.

Cary Sun

X: @SifuSun

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