EX16-MB-000320 - Exchange Mail Quota settings must not restrict receiving mail.


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. Multiple controls 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.


Update the EDSP to specify the value for the Prohibit Send Quota limit or verify that this information is documented by the organization.

Open the Exchange Management Shell and enter the following command:

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

Note: The <IdentityName> and <QuotaLimit> values must be in single quotes.

See Also


Item Details


References: 800-53|SC-5(1), CAT|III, CCI|CCI-001094, Rule-ID|SV-228380r879650_rule, STIG-ID|EX16-MB-000320, STIG-Legacy|SV-95385, STIG-Legacy|V-80675, Vuln-ID|V-228380

Plugin: Windows

Control ID: 27005148594b0ba5fd86663d07cf4fc3d28e76fb066988260ae9da21465ef8f9