Details
You can configure this setting to automatically warn mailbox users that their mailbox is approaching its storage limit. To specify the storage limit, select the check box for this capability, and then specify in kilobytes (KB) how much content users can store in their mailboxes before a warning e-mail message is sent to them. You can enter a value between 0 and 2,147,483,647 KB (2.1 terabytes).
Rationale:
If users exceed their mailbox limits without warning, they may miss important messages requiring them to take immediate action to mitigate a security risk.
Solution
To implement the recommended state, execute the following PowerShell cmdlet:
Set-MailboxDatabase ‘EXCHANGE01Mailbox Database’ -IssueWarningQuota 1991680KB
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: System and Communications Protection.This control applies to the following type of system Windows.