EX13-MB-000165 - The Exchange Mail Store storage quota must issue a warning.
Mail quota settings control the maximum sizes of a user's mailbox and the system's response if these limits are exceeded. Mailbox data that is not monitored against a quota increases the risk of mail loss due to filled disk space, which can also render the system unavailable. There are multiple controls, which supply graduated levels of opportunity to respond before risking data loss. This control sends the user a warning message that the mailbox is reaching its limit. The user at this point can still send and receive email. Note: Best practice is to send this warning when the mailbox reaches 75 percent of capacity. NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Update the EDSP. Open the Exchange Management Shell and enter the following command: Set-MailboxDatabase -Identity <'IdentityName'> -IssueWarningQuota <'WarningQuota'> Note: The <IdentityName> and <WarningQuota> values must be in quotes.