Details

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 email service loss.

This control prohibits the user from sending an email when the mailbox limit reaches the prohibit send quota value.

Note: Best practice for this setting is to prohibit the user from sending email when the mailbox reaches 90 percent of capacity.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Update the EDSP.

Open the Exchange Management Shell and enter the following command:

Set-MailboxDatabase -Identity <'IdentityName'> -ProhibitSendQuota <'QuotaLimit'>

Note: The and values must be in quotes.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Exchange_2013_Y21M01_STIG.zip

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.

References

• 800-53|SC-5(1)
• CAT|III
• CCI|CCI-001094
• Rule-ID|SV-207298r615936_rule
• STIG-ID|EX13-MB-000160
• STIG-Legacy|SV-84625
• STIG-Legacy|V-70003
• Vuln-ID|V-207298

Source

• Tenable.com/audits