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The junk email protection level must be set to No Automatic Filtering.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-223351O365-OU-000006SV-223351r961863_ruleCCI-000366medium
Description
This policy setting controls the Junk E-mail protection level. The Junk E-mail Filter in Outlook helps to prevent junk email messages, also known as spam, from cluttering a user's Inbox. The filter evaluates each incoming message based on several factors, including the time when the message was sent and the content of the message. The filter does not single out any particular sender or message type, but instead analyzes each message based on its content and structure to determine if it is likely spam. A Junk E-mail filtering option of "No Automatic Filtering" will evaluate emails against domain names and email addresses in the blocked sender list and send them to the Junk E-mail folder. A Junk E-mail filtering option of "High" is not recommended when behind enterprise-level capabilities such as Enterprise Email Security Gateway (EEMSG), Cloud-Based Internet Isolation (CBII), and O365 Exchange Online Protection (EOP).
STIGDate
Microsoft Office 365 ProPlus Security Technical Implementation Guide2025-03-05

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CFG-01Configuration Management Program
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
MON-01Continuous Monitoring
1.00
MON-01.7File Integrity Monitoring (FIM)
1.00
CFG-02Secure Baseline Configurations
0.50
CFG-02.7Approved Configuration Deviations
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (100) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-12Session Termination
1.00
AC-16(1)Dynamic Attribute Association
1.00
AC-17(1)Monitoring and Control
1.00
AC-2Account Management
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-24(1)Transmit Access Authorization Information
1.00
AC-25Reference Monitor
1.00

+90 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.4.1
1.00
3.4.2
1.00
CCI1 mapping
CCI-000366
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-09
1.00
PR.PS-01
1.00
PR.DS-10
0.50
PR.PSPlatform Security
0.50
PR.PS-05
0.50

Who does this work

10 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-223351r961863_chk)

Note: If the Outlook client application is not used to access Office 365 email (i.e., email is only accessed via Outlook Web Access [OWA]), this check is not applicable. Verify Outlook Junk E-mail protection is set to "No Automatic Filtering". In Outlook, click Home tab >> Delete group >> Junk >> Junk E-mail Options. Verify Junk E-mail protection is set to "No Automatic Filtering". If the system being inspected is not behind EEMSG, CBII, or O365 EOP, the Junk E-mail protection level must be set to "High". If Junk E-mail protection is not set to "No Automatic Filtering", this is a finding. If the system is not behind enterprise-level capabilities such as EEMSG, CBII, or O365 EOP and the Junk E-mail protection is not set to "High", this is a finding.

Fix Text (F-25012r922086_fix)

In Outlook, click Home tab >> Delete group >> Junk >> Junk E-mail Options. Set the Junk E-mail protection level to "No Automatic Filtering".