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Incident detail

Deliverability Issues to Outlook Emails

Deliverability Issues to Outlook Emails

Resolved incidentMinor0 affected services

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Incident updates

Updates are normalized from the official source chronology so timeline changes remain easy to scan.

  1. Investigating

    We are currently investigating an issue affecting deliverability to Microsoft inbox providers. At this time, some emails sent to Outlook.com, Hotmail.com, and other Microsoft-owned domains may experience delivery delays.

  2. Identified

    We've identified that Microsoft addresses (outlook.⁠com, hotmail.⁠com, and other Microsoft-owned domains) are experiencing delivery delays at an elevated rate. We've informed Microsoft and are monitoring.

  3. Identified

    We’ve identified that this issue is impacting domains in the eu-west-1 region. We’re actively escalating with Microsoft to resolve this as quickly as possible. Please reach out to support@resend.com for any questions and concerns.

  4. Monitoring

    We’re seeing delivery to Outlook.com, Hotmail.com, and other Microsoft-owned domains return to normal. Emails are now being delivered in a timely manner. We’ll continue to monitor closely.

  5. Resolved

    The issue has been resolved, and sending to Microsoft-owned domains has been restored.