Before you quarantine files stored in SharePoint, you need to designate and configure a quarantine folder.
To set up a quarantine mailbox
Quarantine to existing directory to quarantine files to an existing folder.
This folder must already exist as it cannot be created during this process.
In the Select Quarantine Path dropdown list, select the folder you want to designate as the quarantine folder.
Select Authorize for specific sites only to enforce the quarantine settings for only specified SharePoint sites.
In the Restrict to these sites only field, enter the sites for which the quarantine settings will be used.