Safe Attachments

Product

A Microsoft Defender for Office 365 feature that opens email attachments in an isolated sandbox and judges them by behaviour before or while delivering them.

Title graphic: Safe Attachments (Product)

Type	Product

Key points about Safe Attachments

Safe Links and Safe Attachments check URLs and files before users can open them. · Microsoft Defender for Office 365 - Simply…
Impersonation protection, preset policies, Safe Links and Safe Attachments are the policy areas covered. · Defender for Office 365
Phishing slips through when Safe Links, Safe Attachments, anti-phishing and mail flow rules overlap or leave gaps. · Tune Microsoft Defender for Office 365 Against…
Safe Attachments set to Monitor only logs threats; use Block or Dynamic Delivery. · Tune Microsoft Defender for Office 365 Against…

Episodes about Safe Attachments

Microsoft Defender for Office 365 - Simply Explained

2026-07-22 · Video on YouTube

Modern phishing emails copy real branding and writing styles, so a basic spam filter no longer keeps a business safe. This episode is for Microsoft 365 admins, security teams and business owners. You learn how the five protection layers of Microsoft Defender…

Defender for Office 365

2026-10-29 · Video on YouTube

Most tenants run Microsoft Defender for Office 365 on defaults and assume they are protected while attackers test their filters every day. This episode is for email security admins, security engineers and SOC teams who want to tune anti-phishing, Safe Links…

Tune Microsoft Defender for Office 365 Against Phishing

2025-08-05 · Video on YouTube

Your users still click phish—even with Defender for M365 “fully enabled.” The culprit isn’t the attackers; it’s misaligned layers: Safe Links, Safe Attachments, anti-phishing ML, and mail flow rules that overlap, conflict, or leave gaps. This guide traces how…

Timeline of episodes about Safe Attachments

Articles about Safe Attachments (5)

Safe Links and Safe Attachments: Your First Line of Defense
2026-08-13 · Mirko Peters
Welcome back to the podcast companion blog! In today's digital landscape, protecting your organization from ever-evolving cyber threats is no longer optional—…
Why 'Set-and-Forget' Fails: Treating Microsoft Defender as a Living System
2026-08-11 · Mirko Peters
Welcome back to the podcast and our ongoing deep dives into securing your cloud environment. If you have ever felt that sinking feeling when a sophisticated phishin…
Protecting Against Phishing in Teams: Comprehensive Strategies for Microsoft Teams Security
2026-05-21 · Mirko Peters
If you depend on Microsoft Teams every day, you're probably dealing with more than just chat messages and virtual meetings. Phishing attacks are increasingly showin…
Understanding Safe Links and Attachments in Microsoft 365
2026-05-21 · Mirko Peters
If you’re running a business on Microsoft 365, protecting your users from risky links and shady attachments isn’t optional—it’s absolutely n…
Threat Protection in Teams: Safeguarding Collaboration in a Modern Workforce
2026-05-21 · Mirko Peters
Threat protection in Microsoft Teams isn’t just a trendy topic—it’s a real-world issue for businesses navigating the challenges of a digital-first…

Frequently asked questions

How do Safe Links and Safe Attachments protect users?

Safe Links scans URLs and Safe Attachments scans files before the user accesses them. This matters because a link can be dangerous even when the email around it passes every other check. · From the episode: Microsoft Defender for Office 365 - Simply…

What do Safe Links and Safe Attachments do?

They are Defender for Office 365 protections covered as policy areas to tune alongside quarantine, so threats are blocked without too many false positives. · From the episode: Defender for Office 365

Why do users still click phish with Defender for Office 365 enabled?

Misaligned layers: Safe Links, Safe Attachments, anti-phishing and mail flow rules can overlap, conflict or leave gaps. Defender is not set-and-forget. · From the episode: Tune Microsoft Defender for Office 365 Against…

What is the Safe Attachments mistake the episode highlights?

If Safe Attachments is set to Monitor instead of Block or Dynamic Delivery, threats are only logged and not stopped. Dynamic Delivery lets messages arrive while attachments are scanned. · From the episode: Tune Microsoft Defender for Office 365 Against…

Glossary

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Feed for this topic (RSS): entity/safe-attachments/feed.xml
M365.FM episodes on this topic: 3
Articles on this topic: 5

Maintained by Mirko Peters (Microsoft MVP) · Last updated: 2026-11-03