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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
Version 4.0
awareness & training
email protection basics
MarianoSierra's avatar
MarianoSierra
Copper Contributor
Apr 03, 2025

Hello, I have a question... Will it be necessary to comply with SPF and DKIM? Or only DMARC, and for that, can SPF or DKIM authentication aligned? In several services, we configure only DKIM without SPF, as SPF is much less secure, especially considering jump servers. DKIM with ARC is much more secure.. Thanks in advance.

Puneeth's avatar
Puneeth
Icon for Microsoft rankMicrosoft
Apr 04, 2025

SPF and DKIM must pass, but for DMARC, alignment from either SPF or DKIM is sufficient.

  • FoxAtHome's avatar
    FoxAtHome
    Copper Contributor
    May 07, 2025

    How or where do or can I generate a DKIM for "Windows Live Domains"?
    It is old, but I really need to add a DKIM record I read here...