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Emails to Hotmail are rejected using Outlook but are accepted using gmail why

K Richards 0 Reputation points
2025-10-26T07:08:05.41+00:00

My emails to Hotmail are rejected using Outlook but are accepted using gmail. Why?

"Mail delivery failed: returning message to sender

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error."

Outlook | Windows | Classic Outlook for Windows | For business
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  1. Jayden-P 9,795 Reputation points Microsoft External Staff Moderator
    2025-10-26T08:12:48.25+00:00

    Hi @K Richards

    Thank you for posting your question in the Microsoft Q&A forum.

    When an email is not sent successfully, you will receive a non-delivery report (NDR).

    Email non-delivery report (NDR) and SMTP errors in Exchange Online - Exchange | Microsoft Learn

    Do you receive any of this? If yes, please provide the exact NDR message.

    If you are not the IT admin of your organization, please raise this concern to them.

    Ask them to verify your domain appears as Healthy in the Microsoft 365 admin center at Settings > Domains (double check SPF, DKIM, and DMARC).

    I look forward for your reply.

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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