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Microsoft Defender for Office 365 Blog
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Strengthening Email Ecosystem: Outlook’s New Requirements for High‐Volume Senders

Puneeth's avatar
Puneeth
Icon for Microsoft rankMicrosoft
Apr 02, 2025

This applies to Outlook.com - our consumer service, which is supporting hotmail.com live.com and outlook.com consumer domain addresses.

April 29th Update - Changes have been made to the action take on messages that do not meet requirements, please see details below. Introduction In an era where email remains one of the most widel...
Updated Apr 30, 2025
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mackmarchand9's avatar
mackmarchand9
Copper Contributor
Apr 30, 2025

Does this also apply to Exchange Online business customers? 

  • Guido007's avatar
    Guido007
    Copper Contributor
    May 05, 2025

    He said "We don't plan to expand this to Enterprise yet. Enterprise environments have complex mail flows that can break DMARC. We’ll get there eventually, but not with this release. This is focused only on Microsoft's consumer services."