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V-259675

CAT III (Low)

Exchange mail quota settings must not restrict receiving mail.

Rule ID

SV-259675r961152_rule

STIG

Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide

Version

V2R3

CCIs

CCI-001094

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. Failure to allow mail receipt may impede users from receiving mission-critical data.

Check Content

Open the Exchange Management Shell and enter the following command:

Get-MailboxDatabase | Select-Object -Property Name, Identity, ProhibitSendReceiveQuota

If the value of "ProhibitSendReceiveQuota" is not set to "Unlimited", this is a finding.

or

If the value of "ProhibitSendReceiveQuota" is set to an alternate value and has signoff and risk acceptance in the EDSP, this is not a finding.

Fix Text

Open the Exchange Management Shell and enter the following command:

Set-MailboxDatabase -Identity <'IdentityName'> -ProhibitSendReceiveQuota Unlimited

Note: The <IdentityName> value must be in quotes.

or

Enter the value as identified by the EDSP that has obtained a signoff with risk acceptance.