Resolved after 1 day 2 hours, affecting Email Campaigns, on February 25, 2026.
Following the fix that was implemented to resolve failed deliveries to Microsoft addresses, many backlog messages were sent at once. This created a small window in which messages sent to non-Microsoft addresses also failed. We quickly made an additional fix, and are seeing messages be delivered again. Microsoft address recipients may still see some impact, and our team continues to investigate.
Affected components
Update timeline
- investigating Feb 25, 2026, 08:03 PM UTC
We are aware of an issue affecting email delivery to Outlook and Hotmail recipients. Our team is actively investigating the cause and working to restore normal delivery as quickly as possible. We will provide updates as we have them.
- monitoring Feb 25, 2026, 09:26 PM UTC
We have made a change and are monitoring the results of that change.
- investigating Feb 25, 2026, 10:33 PM UTC
Following the fix that was implemented to resolve failed deliveries to Microsoft addresses, many backlog messages were sent at once. This created a small window in which messages sent to non-Microsoft addresses also failed. We quickly made an additional fix, and are seeing messages be delivered again. Microsoft address recipients may still see some impact, and our team continues to investigate.
- resolved Feb 26, 2026, 10:09 PM UTC
This incident has been resolved.
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