The Exchange Mail Store storage quota must issue a warning.

From MS Exchange 2013 Mailbox Server Security Technical Implementation Guide

Associated with: CCI-001094

SV-84627r1_rule The Exchange Mail Store storage quota must issue a warning.

Vulnerability discussion

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.

Check content

Review the Email Domain Security Plan (EDSP). Determine the value for Issue Warning Quota. Open the Exchange Management Shell and enter the following command: Get-MailboxDatabase | Select Name, Identity, IssueWarningQuota If the value of IssueWarningQuota is not set to the site's Issue Warning Quota, this is a finding.

Fix text

Update the EDSP. Open the Exchange Management Shell and enter the following command: Set-MailboxDatabase -Identity <'IdentityName'> -IssueWarningQuota <'WarningQuota'> Note: The and values must be in quotes.

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