ORCA.118.3 - Your own domains are not being allow listed in an unsafe manner in Anti-Spam Policies.

Overview

Emails coming from allow listed domains bypass several layers of protection within Exchange Online Protection. When allow listing your own domains, an attacker can spoof any account in your organisation that has this domain. This is a significant phishing attack vector.

Remediation action

Remove allow listing on domains belonging to your organisation.

Related Links

• Microsoft 365 Defender Portal - Anti-spam settings
• Use Anti-Spam Policy Sender/Domain Allow lists

Test Metadata

Field	Value
Test ID	ORCA.118.3
Severity	Medium
Suite	ORCA
Category	EXO
PowerShell test	Test-ORCA118_3
Tags	EXO, ORCA, ORCA.118.3

Source

• Pester test: tests/orca/Test-ORCA118_3.Tests.ps1
• PowerShell source: powershell/public/orca/Test-ORCA118_3.ps1