Microsoft Defender for Office 365
By Microsoft
Microsoft's native email security layer for Exchange Online, bundled into Microsoft 365 E5 licensing or sold as an add-on for lower tiers, correlating detections with the rest of Microsoft Defender XDR across endpoint and identity signal. The default choice for organizations already fully committed to Microsoft 365, though often paired with a third-party layer for defense in depth.
Verified Source: 1
- Product type
- Software
- Deployment
- SaaS
- Organization size
- SMBMid-marketEnterprise
- Pricing tier
- $$
Capability checklist
How Microsoft Defender for Office 365 measures up against the full Email Security taxonomy.
- Phishing & malware detection — supported
- Blocks malicious links, attachments, and known phishing patterns in inbound email.
- Business email compromise detection — supported
- Flags impersonation and social-engineering attempts that lack a malicious payload.
- Link & attachment sandboxing — supported
- Detonates suspicious links and files in an isolated environment before delivery.
- DMARC/SPF/DKIM enforcement — supported
- Enforces sender authentication standards to block domain spoofing.
- User-reported phishing workflow — supported
- Lets employees report suspicious emails and routes them for rapid review.
- Data loss prevention for email — not supported
- Blocks sensitive data from leaving the organization through outbound email.
Alternatives
Other Email Security tools with overlapping capabilities, sized for similar teams.
Appears in stacks
Real-world stacks that include Microsoft Defender for Office 365.