Microsoft 365 Security Settings Every Admin Should Enable

You already paid for this

Most M365 security capability ships disabled or under-configured. If you have Business Premium or E3/E5, you're leaving protection on the table.

Turn these on first

• Security defaults or Conditional Access — enforce MFA and block legacy authentication
• Anti-phishing and Safe Links/Safe Attachments in Defender for Office 365
• Audit logging (on by default now, but verify retention)
• Self-service password reset with MFA
• DKIM and DMARC on your sending domain

Don't stop at the toggle

Enabling a feature isn't the same as tuning it. Conditional Access in particular rewards careful policy design. If you'd like a second set of eyes, we review M365 tenants routinely.