Microsoft Defender for Office 365: Tenant Allow/Block List will support blocking top-level domains and subdomains

The latest update to Microsoft Defender for Office 365 will enable users to block top-level domains and subdomains via the Tenant Allow/Block List. This feature will be rolled out between late May to late June, and is available to all customers with Microsoft Exchange Online Protection and Microsoft Defender for Office 365 Plan 1 or Plan 2. The update will automatically apply to existing Tenant Allow/Block List entries, without requiring any admin action. Users will be able to block emails from sender email addresses based on their top-level domain by creating block entries in the Tenant Allow/Block List via the Microsoft XDR portal or PowerShell. The top-level domain and subdomain entries will block all emails received from or sent to any email address or subdomain related to the specified domain during mail flow. Inbound emails will be quarantined, and outbound emails will be rejected with a non-delivery receipt. This new feature will provide added security, especially for organizations that need to block certain types of domains and subdomains for regulatory or compliance purposes.

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