M365EXO-001: Anti-spam policy audit
- Plataforma
- Entra ID / M365
- Categoría
- Advanced Threat Protection
- Severidad
- High
- Pilar de Zero Trust
- Applications & Workloads (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Anti-spam policies in Exchange Online Protection filter inbound and outbound email to block unsolicited messages and spam-based phishing campaigns. Misconfigured or default anti-spam settings may not provide adequate protection, allowing malicious emails to reach user inboxes. Customized spam filter policies with appropriate thresholds and actions are essential for reducing the volume of threats delivered to end users.
Valor recomendado
Custom anti-spam policy with high confidence spam quarantined; bulk email threshold set to 6 or lower; outbound spam alerts enabled
Remediación
Review all anti-spam policies in Exchange Online and ensure that high confidence spam and high confidence phishing are set to quarantine rather than deliver to junk folder. Configure the bulk email threshold to 6 or lower to catch aggressive bulk senders and enable notifications for outbound spam detection. Apply the custom policy to all recipient domains and verify that no user-level overrides are weakening the organizational policy.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- NIST SP 800-53
- SI-8
- CIS M365 Benchmark
- 2.1.1