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Quarantining the message means that the message will either be delivered, with the subject text modified to indicate that the message might be spam, to a special "quarantine inbox" assigned to a user or to a "global" quarantine mailbox designated by the administrator
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In the Google Admin console, you can add, edit, delete, and review email quarantines.
To add a quarantine:
Log in to the G suite Admin Console .
From the Admin console, go to Apps > G Suite > Gmail > Manage quarantines.
Click Add Quarantine.
Assign quarantine settings:
Enter a name and description.
For incoming and outgoing messages, choose whether or not to send a reject message to the sender when you deny delivery of a quarantined message.
(Optional) Select Notify periodically when messages are quarantined.
- Click Save.
To edit a quarantine:
- From the Admin console, go to Apps
G Suite
Gmail
Manage quarantines.
Click Edit next to the desired quarantine.
Make the desired changes and click Save.
To delete a quarantine:
- From the Admin console, go to Apps
G Suite
Gmail
Manage quarantines.
- Click Delete to the right of the quarantine name and confirm. Any remaining messages in the quarantine are moved to the Default quarantine.
Note: Quarantines in use by one or more policy settings can't be deleted. To delete an active quarantine, go to the relevant setting and point it to a different quarantine.
To review quarantine settings:
- From the Admin console, go to Apps
G Suite
Gmail
Manage quarantines.
- Click Go to Admin Quarantine. All quarantines, including the admin quarantine, are displayed.
- To the right of the desired quarantine name, click
and choose Settings to display the current settings.