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

This question is outside the scope of this article. Could you please reach out to Sender Support for assistance?

Jai_7's avatar
Jai_7
Copper Contributor
Apr 04, 2025

Thank you for your response. I understand that this question may be outside the scope of the article, but I would appreciate any insights or best practices you can share regarding warming up a new IP and domain. Despite having proper SPF, DKIM, and DMARC authentication in place, our emails are still not reaching the inbox. Without initial inbox placement, it becomes challenging to build sender reputation and successfully warm up the IP and domain.
  Looking forward to your guidance.

  • Heavus's avatar
    Heavus
    Copper Contributor
    Apr 06, 2025

    How does your alignment look? Have you identified all your sending sources? What setting is your DMARC set to P=?.