Defender for Office 365
Safe Attachments, Safe Links, and impersonation protection — configured, tuned, and tested against your real mail flow.
One Phishing Click Is Still the Most Common Breach
Email is still the entry point attackers reach for first. A link that looks legitimate. An attachment from a known vendor. A CEO fraud message sent to accounting on a Friday afternoon. Exchange Online's built-in filtering catches the obvious — it does not catch the targeted ones.
This is not a failure of your IT team. Defender for Office 365 Plan 1 already sits in Microsoft 365 Business Premium and, since 1 July 2026, in Microsoft 365 E3 and Office 365 E3. What is missing is the configuration: the default anti-phishing policy carries no impersonation protection at all, Safe Attachments and Safe Links have to be created and scoped, and every exception needs a documented unblock path. Without a structured rollout, the first broken workflow gets reported to the helpdesk, the policy gets disabled, and the protection is gone.
Traditional consulting for MDO? A week of billable hours for what is mostly clicking through admin-center wizards. The consultant leaves. Your team does not know why a specific setting was chosen.
ACTIVITIES IN DETAIL
DELIVERABLES
Policy Inventory: Plan coverage, anti-spam, anti-malware, and every policy with scope and priority
Mail Flow and Authentication: MX, gateways, bypassing transport rules, plus SPF, DKIM, and DMARC
Preset or Custom: Both paths costed in control and upkeep, decided per recipient group
Threat Policies: Safe Attachments, Safe Links, and impersonation protection across mail and Teams
Baseline Hardening: Allowed senders, bulk threshold, attachment filter, outbound forwarding
Zero-hour Auto Purge: Verified for mail and Teams against the same quarantine policies
Reporting and Review: Report button workflow, high-severity alerts, and the weekly routine
Exception Register: Every allowed URL, sender, IP, and domain with justification and review date
Next steps after Defender for Office 365
A cleanly configured tenant is the foundation. These blueprints build directly on it
