Microsoft Defender for Office 365: Support DKIM Domain as Sending Infrastructure for Spoof intelligence management

Originally posted by Microsoft Jun 15, 2022 Microsoft Defender for Office 365 0 Comments

For Microsoft Defender for Office 365 and Exchange Online Protection, we are adding support for providing “DKIM verified domain” as the “Sending Infrastructure” within Tenant allow-block lists-Spoofing, so that Security Administrators can better manage Anti-Spoofing activity and override it based on Spoof Intelligence. Currently, what is supported in this field is either the domain from DNS PTR record or /24 IP Subnet. Additionally, being able to specify a ‘DKIM verified domain’ will help serve scenarios where shared infrastructure provider services are used for sending emails. Since the DKIM domain is unique to each tenant and if it passes verification even when other authentication signals fail, if desired for legitimate business reasons, a spoofed message can still be allowed instead of being blocked.
More info: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/tenant-allow-block-list?view=o365-worldwide#domain-pair-syntax-for-spoofed-sender-entries-in-the-tenant-allowblock-list

Product	Microsoft Defender for Office 365
Release phase	General Availability
Release date	July CY2022
Platform	Web
Cloud Instance	DoD, Worldwide (Standard Multi-Tenant), GCC High, GCC
Created	2022-06-14
Roadmap ID	93359
Roadmap Link	https://www.microsoft.com/microsoft-365/roadmap?featureid=93359