STIGQter: STIG Summary: Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 30 Jan 2025:

Exchange nonexistent recipients must not be blocked.

DISA Rule

SV-259613r961161_rule

Vulnerability Number

V-259613

Group Title

SRG-APP-000261

Rule Version

EX19-ED-000127

Severity

CAT II

CCI(s)

• CCI-001308 - Automatically update spam protection mechanisms on an organization-defined frequency.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-RecipientFilterConfig -RecipientValidationEnabled $false

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Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Additionally, the default value for "RecipientValidationEnabled" is "False".

Open the Exchange Management Shell and enter the following command:

Get-RecipientFilterConfig | Select-Object -Property Name, RecipientValidationEnabled

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

Vulnerability Number

V-259613

Documentable

False

Rule Version

EX19-ED-000127

Severity Override Guidance

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Additionally, the default value for "RecipientValidationEnabled" is "False".

Open the Exchange Management Shell and enter the following command:

Get-RecipientFilterConfig | Select-Object -Property Name, RecipientValidationEnabled

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

Check Content Reference

M

Target Key

5579