ORCA.240: Outlook is configured to display external tags for external emails.
| ID | ORCA.240 |
| Severity | Medium |
| Suite | ORCA |
| Product | Defender |
| Related products | Exchange Online |
| Feature | Tenant settings |
| Security area | Email and collaboration protection |
| Resource type | Tenant |
| User impact of fixing | Low |
| Effort to fix | Low |
| Framework controls | nist-800-53-r5:SI-8 Spam Protection |
| MITRE ATT&CK | T1566 |
| Reads from | Exchange Online |
What this checks and how to fix it
Section titled “What this checks and how to fix it”External tags show users email that is coming from external. EOP & MDO works with native client side integration to clearly highlight external emails. This allows you to train users to identify these emails so that they can be more suspicious about the email contents.
Remediation action
Section titled “Remediation action”Configure external tags to highlight emails which are sent from external.
Related Links
Section titled “Related Links”Mito check, based on ORCA. Author: soulemike. Open-source licences.
Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).
© 2026 Virtual Petals. Mito is a Virtual Petals service, hosted in Microsoft Azure UAE North.
