After activating the SaaS application, Email Security inspects emails, messages, and files for the selected users in the Microsoft 365/Google account.
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Go to Security Settings > SaaS Applications.
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Click Configure for Office 365 Mail or Gmail.
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In the Configure Office 365 Mail Security pop-up, click Configure groups filter.
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Select a group selection.
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All organization - Licenses will be assigned automatically to your user mailboxes.
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Specific group - Enter the name of the group in Office 365 or Google Workspace containing the user mailboxes or groups of user mailboxes you wish to protect with Email Security.
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Click OK.
Now, the Email Security limits the license consumption and security inspection for that specific group.