Issue Identified: Automatic Forwarding Failures in Exchange Online

Update timeline

1. investigating May 15, 2025, 08:54 AM UTC

   We are currently investigating an issue impacting automatic mail forwarding in Exchange Online: Issue ID EX1072592. Affected users may experience delays or failures in receiving forwarded mail due to a fault within the Exchange system. Our Engineering team is actively investigating and closely monitoring the situation. We will provide further updates as more information becomes available

2. monitoring May 16, 2025, 09:26 AM UTC

   Microsoft Exchange Online has completed the deployment of a code fix to address the underlying regression, which has resolved the issue for newly sent messages. They are now initiating a targeted recovery process for messages affected during the impacted timeframe and are actively working on a scalable solution to ensure full remediation: Issue ID EX1072592 As a result, some previously unforwarded emails may now begin to be delivered. Sedna customers may notice the arrival of older messages - potentially up to a few days old - as part of this recovery effort. We will continue to monitor the situation and provide updates as new information becomes available

3. resolved May 20, 2025, 10:29 AM UTC

   Final Update on Exchange Online Forwarding Issue — Issue ID: EX1072592 Microsoft has confirmed that messages users attempted to forward between 2:04 PM UTC on May 11, 2025, and 5:00 AM UTC on May 16, 2025, will not be automatically replayed. Sedna users who wish to have emails from this period re-forwarded should contact Microsoft Support directly and reference Issue ID EX1072592. This will allow Microsoft to initiate a manual recovery of the affected messages.