Current answer
ESET experienced a major incident: MS Exchange Online email scanning delayed in US and EU. ServiceAlert observed recovery on Sep 18, 2026.
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Incident Lifecycle
Affected Components
Europe, Africa, Asia Pacific, Japan
Americas, Oceania
Incident Timeline
Monitoring
The service should be restored in both regions. We continue to monitor the behavior.
Sep 16, 2026 at 9:08 AM UTC
Identified
US environment should not be affected anymore. Mail are processing without any delay.
EU region still affected.
EU region still affected.
Sep 16, 2026 at 4:14 AM UTC
Investigating
We are currently experiencing a delay in MS Exchange Online email scanning that is estimated to 10-30 minutes.
EU and US regions are affected.
To mitigate the issue, the MailScanService was restarted on the SFC machines.
The root cause of the issue has not yet been identified and is currently under investigation.
EU and US regions are affected.
To mitigate the issue, the MailScanService was restarted on the SFC machines.
The root cause of the issue has not yet been identified and is currently under investigation.
Sep 15, 2026 at 7:39 PM UTC
Monitoring
The scanning process has returned to normal operation. We will continue to monitor performance in case the issue reoccurs.
Sep 15, 2026 at 8:12 AM UTC
Identified
Scanning process had returned to normal operation.
Sep 15, 2026 at 8:06 AM UTC
Investigating
Scanning process had returned to normal operation.
We'll monitor performance during work hours in case the issue reoccurs.
We'll monitor performance during work hours in case the issue reoccurs.
Sep 15, 2026 at 3:40 AM UTC
Investigating
We are currently experiencing a delay in MS Exchange Online email scanning that is estimated to 10-30 minutes.
To mitigate the issue, the MailScanService was restarted on the SFC machines.
We are currently waiting for the new TTL settings to take full effect and for the scanning process to return to normal operation.
The root cause of the issue has not yet been identified and is currently under investigation.
To mitigate the issue, the MailScanService was restarted on the SFC machines.
We are currently waiting for the new TTL settings to take full effect and for the scanning process to return to normal operation.
The root cause of the issue has not yet been identified and is currently under investigation.
Sep 14, 2026 at 7:29 PM UTC
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