* Create a Content Compliance Rule:
* Access the Google Admin console.
* Go to Apps > Google Workspace > Gmail > Compliance.
* Click on "Add another rule" to create a new content compliance rule.
* Define the conditions to detect sensitive data within email content.
* Set actions to quarantine or reject emails that contain sensitive information.
* Turn Off Dynamic Email:
* In the Admin console, go to Apps > Google Workspace > Gmail > User settings.
* Turn off dynamic email for your organization or specific organizational units.
* Save and Apply:
* Save the compliance rule and dynamic email settings.
* These configurations ensure that sensitive data in Doc comments does not appear in recipient inboxes.
References:
* Google Workspace Admin Help: Set up content compliance
* Google Workspace Admin Help: Turn dynamic email on or off

https://support.google.com/a/answer/33786?hl=en
https://support.google.com/a/answer/174124?hl=en

* Access Security Dashboard: Go to the Google Admin console and navigate to the 'Security' section.
* Open Spam Filter Report: In the security dashboard, open the spam filter report.
* Filter by Time Period: Select the specific time period you want to analyze.
* Review Spam Messages: Review the detailed information regarding each message marked as spam by Google's spam filter.
* Take Necessary Actions: Use the information from the report to adjust spam filters, user alerts, or take other necessary actions to manage spam more effectively.
References
* Security Dashboard
* Email Log Search

To enable others to help manage the admin quarantine while maintaining security, give the users Services > Gmail > Access Admin Quarantine admin privileges. This specific privilege allows designated users to view and manage the admin quarantine without granting excessive administrative rights.
* Go to the Admin console.
* Navigate to Account > Admin roles.
* Select the role that you want to assign to users or create a new role.
* Assign the "Services > Gmail > Access Admin Quarantine" privilege to the role.
* Add the users to this role.
References:
* Google Workspace Admin Help: Admin quarantine