Existing Office 365 Subsciption
Office 365 Advanced Threat Protection (ATP) helps to protect your organisation from malicious attacks and is included in subscriptions, such as Office 365 Enterprise E5, Office 365 Education A5 and Microsoft 365 Business. If your plan does not include (ATP) you can purchase as a Paid addon to your existing Office 365 Subscription.
Office 365 Advanced Threat Protection (ATP) protects you by;
Scanning email attachments with ATP Safe Attachments
Scanning web addresses (URLs) in email messages and Office documents with ATP Safe Links
Identifying and blocking malicious files in online libraries with ATP for SharePoint, OneDrive, and Microsoft Teams
Checking email messages for unauthorized spoofing with spoof intelligence
Detecting when someone attempts to impersonate your users and your organisations' custom domains with ATP anti-phishing capabilities in Office 365
Protection through Office 365 ATP is determined by policies that your organisations' security team defines for Safe Links, Safe Attachments, and Anti-Phishing.