SEDNA incident
Microsoft service disruption affecting Microsoft Graph email egress
SEDNA experienced a notice incident on August 31, 2026, lasting 3d 12h. The incident has been resolved; the full update timeline is below.
Update timeline
- investigating Aug 31, 2026, 07:49 PM UTC
Microsoft has reported service degradation that may affect outbound emails sent from Sedna via Microsoft Graph. Customers may experience delays or failures when sending emails. We are monitoring the situation and will provide updates as they become available.
- investigating Aug 31, 2026, 07:49 PM UTC
We are continuing to investigate this issue.
- investigating Sep 01, 2026, 01:28 AM UTC
The Microsoft service degradation is still ongoing. Microsoft has not yet provided an estimated time for resolution. We continue to monitor the situation and will provide further updates as they become available.
- investigating Sep 01, 2026, 07:46 AM UTC
Some users are reporting improved mail flow this morning. Microsoft's service degradation (EX1464935) remains listed as active as of 06:39 UTC, and we continue to monitor closely. We will post a further update once Microsoft confirms full resolution or if conditions change.
- investigating Sep 02, 2026, 02:30 AM UTC
We have received reports that services have returned to normal. Microsoft’s service degradation, EX1464935, remains listed as active as of September 2, 2026, at 01:32:37 UTC. We will continue to monitor the situation closely and provide a further update once Microsoft confirms full resolution or if conditions change.
- investigating Sep 02, 2026, 09:28 AM UTC
We are continuing to investigate this issue.
- monitoring Sep 02, 2026, 09:29 AM UTC
Microsoft has reported that core mail flow and search functionality are recovering, with service availability above 99%. The majority of users should no longer be experiencing impact. We are continuing to monitor to confirm persistent stability before closing this incident. Microsoft's next update is expected by September 2, 2026, at 4:30 PM UTC. We will update this page accordingly.
- resolved Sep 04, 2026, 08:45 AM UTC
Resolved – Microsoft has confirmed full recovery from the service degradation affecting Graph-based mail flow (EX1464935). All Sedna services related to Microsoft Graph email egress are now operating normally. We've seen no further reports of impact since our last update. Thank you for your patience while we monitored this alongside Microsoft.