Deliverability Issues to Outlook Emails

Update timeline

1. investigating Mar 17, 2026, 03:47 PM UTC

   Status: 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 Mar 17, 2026, 03:58 PM UTC

   Status: 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 Mar 18, 2026, 12:32 AM UTC

   Status: 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 [email protected] for any questions and concerns.

4. monitoring Mar 18, 2026, 08:53 AM UTC

   Status: 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 Mar 18, 2026, 02:27 PM UTC

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