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

Exchange must not send nondelivery reports to remote domains.

DISA Rule

SV-259706r961620_rule

Vulnerability Number

V-259706

Group Title

SRG-APP-000435

Rule Version

EX19-MB-000231

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-RemoteDomain -Identity <'IdentityName'> -NDREnabled $false

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

Check Contents

Note: For the purpose of this requirement, "remote" refers to those domains external to the DODIN, whether classified or unclassified. NDRs between DODIN networks is permitted.

Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select-Object -Property Name, Identity, NDREnabled

If the value of "NDREnabled" is not set to "False", this is a finding.

Vulnerability Number

V-259706

Documentable

False

Rule Version

EX19-MB-000231

Severity Override Guidance

Note: For the purpose of this requirement, "remote" refers to those domains external to the DODIN, whether classified or unclassified. NDRs between DODIN networks is permitted.

Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select-Object -Property Name, Identity, NDREnabled

If the value of "NDREnabled" is not set to "False", this is a finding.

Check Content Reference

M

Target Key

5580