Outage in WorkOS
Delayed Email Deliverability
Resolved MinorIncident Report
Summary AI Generated
WorkOS experienced a 45-hour email deliverability issue affecting Microsoft 365 tenant domains, causing delayed or failed email delivery for recipients on those domains. Consumer Microsoft domains (outlook.com, hotmail.com, live.com, msn.com) and customers using custom email providers were unaffected. The issue was resolved after Microsoft's Outlook team implemented mitigations, restoring normal email delivery to Microsoft 365 domains.
We are seeing deliverability issues with emails sent to Microsoft / Outlook recipients.
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Latest Updates ( sorted recent to last )
RESOLVED
20 days ago - at 08/16/2026 10:04PM
Microsoft's Outlook team has confirmed that mitigations have been implemented. We've verified that email delivery to Microsoft 365 domains is operating normally again.
This incident has been resolved.
IDENTIFIED
21 days ago - at 08/15/2026 04:21PM
We continue to see email deliverability issues to a subset of Microsoft 365 tenant domains. This does not affect consumer domains such as outlook.com, hotmail.com, live.com or msn.com. We will provide updates as they become available.
MONITORING
22 days ago - at 08/15/2026 03:32AM
We are observing improvements in deliverability to Microsoft email addresses, in line with the resolution of an incident with our upstream email service provider. We will continue to monitor.
IDENTIFIED
22 days ago - at 08/15/2026 01:35AM
We continue to experience deliverability delays to a subset of users with email addresses hosted by Microsoft / Office 365.
We are working with our email providers to mitigate the issues, we will provide updates as they become available.
Customers using their own custom email providers are not affected.
INVESTIGATING
22 days ago - at 08/15/2026 12:24AM
We are seeing deliverability issues with emails sent to Microsoft / Outlook recipients.
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