STIGQter: STIG Summary: Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 02 Jul 2025:

Exchange mail quota settings must not restrict receiving mail.

DISA Rule

SV-259675r961152_rule

Vulnerability Number

V-259675

Group Title

SRG-APP-000246

Rule Version

EX19-MB-000122

Severity

CAT III

CCI(s)

• CCI-001094 - Restrict the ability of individuals to launch organization-defined denial of service attacks against other systems.

Weight

10

Fix Recommendation

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.

Check Contents

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.

Vulnerability Number

V-259675

Documentable

False

Rule Version

EX19-MB-000122

Severity Override Guidance

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.

Check Content Reference

M

Target Key

5580