The issue has been resolved.

The service should be restored in both regions. We continue to monitor the behavior.

US environment should not be affected anymore. Mail are processing without any delay. EU region still affected.

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.

The scanning process has returned to normal operation. We will continue to monitor performance in case the issue reoccurs.

Scanning process had returned to normal operation.

Scanning process had returned to normal operation. We'll monitor performance during work hours in case the issue reoccurs.

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.