Resolved after 21 hours 19 minutes, affecting Outbound and Outbound and 1 more, on November 12, 2026.
We've seen email delivery to Microsoft return to normal levels. We're continuing to monitor.
Affected components
Update timeline
- investigating Nov 12, 2026, 09:17 PM UTC
We're investigating reports that some outbound emails sent from Intercom aren't reaching recipients.
- identified Nov 12, 2026, 10:01 PM UTC
We’ve confirmed that the delays are caused by an ongoing Microsoft outage, EX1550543: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. Our email service provider is tracking their response to the outage on their own status page: https://status.sparkpost.com/incidents/37r4xk532jd6. Any emails that fail to deliver are queued and will be retried periodically. Our team is monitoring the outage and will update as the situation develops.
- identified Nov 13, 2026, 09:58 AM UTC
We're continuing to monitor delivery failure rates to Microsoft recipients. Delivery to other email providers remain unaffected.
- monitoring Nov 13, 2026, 03:55 PM UTC
We've seen email delivery to Microsoft return to normal levels. We're continuing to monitor.
- resolved Nov 13, 2026, 06:36 PM UTC
This incident is now resolved.
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