Outage in ESET
MS Exchange Online email scanning delayed in US and EU
Major
September 14, 2026 - Started 4 days ago
Official incident page
Official incident page
Incident Report
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.
Components affected
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Latest Updates ( sorted recent to last )
MONITORING
2 days ago - at 09/16/2026 09:08AM
The service should be restored in both regions. We continue to monitor the behavior.
IDENTIFIED
2 days ago - at 09/16/2026 04:14AM
US environment should not be affected anymore. Mail are processing without any delay.
EU region still affected.
INVESTIGATING
3 days ago - at 09/15/2026 07:39PM
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.
MONITORING
3 days ago - at 09/15/2026 08:12AM
The scanning process has returned to normal operation. We will continue to monitor performance in case the issue reoccurs.
IDENTIFIED
3 days ago - at 09/15/2026 08:06AM
Scanning process had returned to normal operation.
INVESTIGATING
3 days ago - at 09/15/2026 03:40AM
Scanning process had returned to normal operation.
We'll monitor performance during work hours in case the issue reoccurs.
INVESTIGATING
4 days ago - at 09/14/2026 07:29PM
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.
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