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

Exchange must have anti-spam filtering configured.

DISA Rule

SV-259691r961161_rule

Vulnerability Number

V-259691

Group Title

SRG-APP-000261

Rule Version

EX19-MB-000139

Severity

CAT II

CCI(s)

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

Weight

10

Fix Recommendation

Note: Configure the IP addresses of every internal SMTP server. If the Mailbox server is the only SMTP server running the anti-spam agents, configure the IP address of the Mailbox server.

Update the EDSP with the anti-spam mechanism used.

Open the Exchange Management Shell and enter the following command:

Single SMTP server address:

Set-TransportConfig -InternalSMTPServers @{Add='<ip address1>'}

Multiple SMTP server addresses:

Set-TransportConfig -InternalSMTPServers @{Add='<ip address1>','<ip address2>'}

Check Contents

Review the Email Domain Security Plan (EDSP).

Note: If using another DOD-approved anti-spam product for email or a DOD-approved email gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable.

Determine the internal SMTP servers.

Open the Exchange Management Shell and enter the following command:

Get-TransportConfig | Format-List InternalSMTPServers

If any internal SMTP server IP address returned does not reflect the list of accepted SMTP server IP addresses, this is a finding.

Vulnerability Number

V-259691

Documentable

False

Rule Version

EX19-MB-000139

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Note: If using another DOD-approved anti-spam product for email or a DOD-approved email gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable.

Determine the internal SMTP servers.

Open the Exchange Management Shell and enter the following command:

Get-TransportConfig | Format-List InternalSMTPServers

If any internal SMTP server IP address returned does not reflect the list of accepted SMTP server IP addresses, this is a finding.

Check Content Reference

M

Target Key

5580