Mar <var data-var='date'>23</var>, <var data-var='time'>10:45</var> GMT Resolved - The issue causing elevated CPU load in the Dublin2 cluster has been identified and mitigated. We have implemented measures to prevent recurrence. All services have resumed and should now be operating normally.

Dublin2 Performance Issues

Mar <var data-var='date'>18</var>, <var data-var='time'>13:09</var> GMT Resolved - Correct measures was put in place once delay was noted by our engineers. This has been monitored and we can confirm that service has been restored and is working as expected.Mar <var data-var='date'>18</var>, <var data-var='time'>10:48</var> GMT Investigating - We are investigating reports of delayed mail between 10:20 am and 10:35 am GMT. We have implemented a corrective measure and are seeing normal mail delivery. Our engineering team is actively investigating the cause. We will provide further updates as soon as more information becomes available.

Mail Delay : Dublin 2

Mar <var data-var='date'>16</var>, <var data-var='time'>13:16</var> GMT Resolved - Earlier today (from 11:31 to 12:09 UTC) we experienced a performance degradation of email ingress and egress globally across tenants in our public clusters. This was caused by abnormally expensive processing of a set of malformed emails sent to a large number of recipients. We will continue to monitor and investigate how our systems can be updated to improve resilience.Mar <var data-var='date'>16</var>, <var data-var='time'>12:41</var> GMT Monitoring - System appears to be operational. Our engineering team will continue to monitor this from our end.Mar <var data-var='date'>16</var>, <var data-var='time'>12:37</var> GMT Investigating - We are currently investigating an issue affecting mail ingress and egress globally. From 11:30 to 12:00 UTC some customers may have experienced delays or disruptions in email processing. Our engineering team is actively investigating the cause. We will provide further updates as soon as more information becomes available.

Mail Ingress & Egress Delay : Global

Feb <var data-var='date'>12</var>, <var data-var='time'>20:38</var> GMT Resolved - This incident has been resolved, and all back logged messages have been processedFeb <var data-var='date'>12</var>, <var data-var='time'>20:18</var> GMT Monitoring - Clusters are now healthy, and the backlog is being processed, we estimate 30 minutes.Feb <var data-var='date'>12</var>, <var data-var='time'>19:51</var> GMT Update - We are continuing to investigate this issue, and will update every hour until it is resolved.Feb <var data-var='date'>12</var>, <var data-var='time'>18:48</var> GMT Investigating - An outage affecting Sedna’s mail egress and ingress services has been identified on specific infrastructure EU clusters. Affected users are unable to send and receive mail. The issue is under investigation by engineering as an emergency.

Mail Ingress & Egress Outage: Some Customers in EU Clusters unable to Send and Receive Mail

Jan <var data-var='date'>23</var>, <var data-var='time'>07:01</var> GMT Resolved - This incident has been resolved.Jan <var data-var='date'>23</var>, <var data-var='time'>03:00</var> GMT Update - We are continuing to investigate this issue.Jan <var data-var='date'>22</var>, <var data-var='time'>21:00</var> GMT Investigating - Microsoft Outage: Degraded Service Microsoft is currently experiencing degraded service functionality. As a result, recipients using Microsoft mailboxes may not receive emails, and messages sent from Sedna may result in NDRs. Updates on Microsoft’s Service Health Status can be found here: https://status.cloud.microsoft/m365

Microsoft Outage

Jan <var data-var='date'>16</var>, <var data-var='time'>00:15</var> GMT Resolved - This incident has been resolved.Jan <var data-var='date'>15</var>, <var data-var='time'>22:45</var> GMT Investigating - An outage affecting Sedna’s mail egress and egress services has been identified across our Virginia1 Cluster. Affected users may experience delays with sending and receiving mail. The issue is under investigation by Sedna's Engineering team as an emergency.

Mail Flow Delay: Virginia1 Cluster

Jan <var data-var='date'>15</var>, <var data-var='time'>21:30</var> GMT Resolved - This incident has been resolved.Jan <var data-var='date'>15</var>, <var data-var='time'>20:56</var> GMT Update - An outage affecting Sedna’s mail egress and ingress services has been identified on specific infrastructure EU clusters. Affected users are unable to send and receive mail. The issue is under investigation by engineering as an emergency.Jan <var data-var='date'>15</var>, <var data-var='time'>20:55</var> GMT Investigating - We are currently investigating this issue.

Mail Ingress & Egress Outage: Customers in EU Clusters unable to Send and Receive Mail

Jan <var data-var='date'>13</var>, <var data-var='time'>15:10</var> GMT Completed - The scheduled maintenance has been completed.Jan <var data-var='date'>13</var>, <var data-var='time'>15:00</var> GMT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Jan <var data-var='date'>10</var>, <var data-var='time'>13:03</var> GMT Scheduled - To ensure continued performance and reliability, our Engineering team will be carrying out essential maintenance on the Singapore 1 cluster on January 13th between 15:00 and 16:00 UTC. As part of this work, a brief service interruption of approximately 10 minutes is expected. During this time, users may be unable to access Sedna. Services will automatically recover once the maintenance is complete, and no data loss or configuration changes are expected. This maintenance is part of routine platform updates to improve performance, stability, and reliability. We appreciate your understanding and patience as we complete this work and continue to maintain our high service standards.

Essential Maintenance on Singapore 1 Cluster

Jan <var data-var='date'>12</var>, <var data-var='time'>03:10</var> GMT Completed - The scheduled maintenance has been completed.Jan <var data-var='date'>12</var>, <var data-var='time'>03:00</var> GMT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Jan <var data-var='date'>10</var>, <var data-var='time'>12:38</var> GMT Scheduled - To ensure continued performance and reliability, our Engineering team will be carrying out essential maintenance on the Dublin 1 cluster on January 12th between 03:00 and 03:30 (BST). As part of this work, a brief service interruption of approximately 10 minutes is expected. During this time, users may be unable to access Sedna. Services will automatically recover once the maintenance is complete, and no data loss or configuration changes are expected. Due to the nature of this maintenance, we’re unable to provide the standard 72-hour notice. We understand this may cause inconvenience and apologise for the short notice. This work is necessary to improve platform performance, and we appreciate your patience and understanding as we complete this maintenance to maintain our high service standards.

Essential Maintenance on Dublin 1 Cluster

Dec <var data-var='date'>10</var>, <var data-var='time'>09:47</var> GMT Resolved - This incident has been resolved.Dec <var data-var='date'>10</var>, <var data-var='time'>09:39</var> GMT Monitoring - Estimated impact window: 08:40–09:05 UTC During this time, mail could not be sent or received in our EU cluster. Service has since fully recovered, and the system is currently healthy. All incoming mail from the affected window has been successfully reprocessed and no messages were lost. Any outbound messages that could not be delivered would have generated an NDR; if you received one, please resend the message. We are investigating the root cause and will provide further updates. In the interim, if you notice any mail delivery failures or unexpected behaviour, please let us know.

Mail Ingress & Egress Outage: Customers in our EU Cluster unable to Send and Receive Mail

Nov <var data-var='date'> 3</var>, <var data-var='time'>22:30</var> GMT Completed - The scheduled maintenance has been completed.Nov <var data-var='date'> 3</var>, <var data-var='time'>22:00</var> GMT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Nov <var data-var='date'> 3</var>, <var data-var='time'>14:13</var> GMT Scheduled - Dear Customers, We will be performing urgent maintenance this evening to complete further RDS optimisations following recent configuration changes. As part of this work, we’ll be implementing database and infrastructure improvements to enhance overall stability and performance. Maintenance Window Date: Monday, 3 November 2025 Time: 22:00 – 22:30 (UTC) Expected Impact: Brief service interruption of approximately 5 minutes within the 30-minute maintenance window This work is being carried out during the quietest usage period for the cluster to minimise any disruption. Services will automatically resume once the process is complete. We appreciate your understanding while we complete this optimisation work.

Essential Maintenance on Dublin2

Oct <var data-var='date'>27</var>, <var data-var='time'>10:41</var> GMT Resolved - Dear Customers, Mail delivery services have now been restored, and new mail is flowing as expected. Thank you for your patienceOct <var data-var='date'>27</var>, <var data-var='time'>10:38</var> GMT Identified - Dear Customers, We’re aware that some may currently be experiencing issues creating and receiving new mail. Our engineering team is actively investigating and working to resolve the issue as quickly as possible. We’ll provide updates as the engineering team progress on resolving the issue. Next update estimated in 15 mins

Mail Creation and Delivery Issues on Dublin2 cluster

Oct <var data-var='date'>20</var>, <var data-var='time'>22:00</var> BST Resolved - Dear Customer, We're pleased to inform you that the latest update from AWS is that the issue has now been completely resolved. https://health.aws.amazon.com/health/status All systems are working as expected and all services should be back to full operational efficiency. Thank you for your patience and understandingOct <var data-var='date'>20</var>, <var data-var='time'>17:44</var> BST Monitoring - Platform performance issues have been identified and are affecting some Sedna customers across infrastructure clusters (virginia1 and default). Affected users may see slowness and/or spinners intermittently when accessing the platform, specifically impacting auto-tagging functionality. The issue is under investigation by engineering as an emergency and is related to the AWS incident from earlier today.

Platform performance issues: Customers experiencing autotagging slowness in Virginia1 and default clusters

Oct <var data-var='date'>20</var>, <var data-var='time'>13:06</var> BST Resolved - Dear Customers, We’re pleased to confirm that all services are now operating normally. The earlier disruption, which was linked to an AWS outage in the has been fully resolved. Our systems are stable, and mail flow and processing have returned to normal. We’ll continue to monitor closely to ensure everything remains stable. Thank you for your patience and understanding throughout this incident.Oct <var data-var='date'>20</var>, <var data-var='time'>11:47</var> BST Monitoring - Dear Customers, AWS has confirmed that the underlying issue has been mitigated, and most services are operating normally again. Some throttling and backlogs are still being cleared, particularly affecting the US-EAST-1 region, which may cause intermittent delays or errors. Our team continues to monitor the situation closely and will provide further updates as AWS progresses toward full resolution. Thank you for your patience and understanding.Oct <var data-var='date'>20</var>, <var data-var='time'>10:14</var> BST Update - Dear Customers, The mail flow issue affecting some customers remains ongoing and is linked to a wider AWS outage impacting multiple services. Our engineers continue to monitor the situation closely and are working to restore full functionality when AWS systems recover. For more information, you can track updates directly from AWS via their status page: https://health.aws.amazon.com/health/status We’ll continue to provide updates as they become available. Thank you for your continued patience and understanding.Oct <var data-var='date'>20</var>, <var data-var='time'>09:11</var> BST Identified - Dear Customers, We've identified that the widespread mail flow issue affecting some customers is related to an ongoing AWS outage impacting our infrastructure. As a result, mail delivery and processing may be delayed. Our engineering team is closely monitoring the situation and working with AWS to restore normal service as soon as possible. We’ll share further updates as more information becomes available.Oct <var data-var='date'>20</var>, <var data-var='time'>08:39</var> BST Investigating - Dear Customers, We’re currently experiencing a mail flow issue, which is causing emails to queue and may also impact incoming mail delivery. Our engineering team is actively investigating and working to resolve the issue as quickly as possible. We’ll provide updates as more information becomes available. Thank you for your patience and understanding.

Mail Flow Issue related to AWS outage - US-EAST-1

Oct <var data-var='date'>20</var>, <var data-var='time'>11:55</var> BST Resolved - Dear Customers, Mail delivery services have now been restored, and new mail is flowing as expected. We continue to monitor performance closely to ensure full stability. Thank you for your patienceOct <var data-var='date'>20</var>, <var data-var='time'>10:59</var> BST Investigating - Dear Customers, We’re aware that some may currently be experiencing issues creating and receiving new mail. Our engineering team is actively investigating and working to resolve the issue as quickly as possible. We’ll continue to provide updates as more information becomes available. Thank you for your patience and understanding.

Oct <var data-var='date'>17</var>, <var data-var='time'>13:32</var> BST Resolved - Dear Customers, The backlog of emails has now been fully processed, and mail flow is functioning normally. We understand the inconvenience this may have caused and appreciate your patience as we resolved the issue. The system was first impacted at approximately 8:30AM (GMT+1) with the system partially restored at 10:45AM (GMT+1) and all systems restored and mail delivered at 12:32 PM (GMT+1). We appreciate your patience while we worked to resolve the issue, we will be delivered a full incident report by end of day on Monday October 20.Oct <var data-var='date'>17</var>, <var data-var='time'>13:18</var> BST Update - Dear Customers, Mail delivery services have now been restored, and new mail is flowing as expected. The remaining backlog is currently being processed and will be cleared shortly. We continue to monitor performance closely to ensure full stability and update you once everything has been processed. Thank you for your patienceOct <var data-var='date'>17</var>, <var data-var='time'>12:05</var> BST Update - Dear Customers, Our team continues to work on fully resolving the mail delivery issue. While new mail is flowing into the platform, there may still be intermittent issues as we complete the recovery process. We’ve temporarily paused queued mail processing to allow our engineers to address and resolve the root cause. We’re closely monitoring the situation and will provide another update as soon as more information becomes available. Thank you for your continued patience.Oct <var data-var='date'>17</var>, <var data-var='time'>11:34</var> BST Update - Dear Customers, We're currently processing the queued mail and expect the process to be completed within the next 15 mins. Once this has been completed we will confirm with an update. Thank you once again for your continue patienceOct <var data-var='date'>17</var>, <var data-var='time'>10:56</var> BST Update - Dear Customer We have identified the root cause of the problem and are actively working on a resolution. New mail has been successfully flowing into the platform since approximately 10:45AM BST, and older mail is expected to be delivered shortly. We will provide the next update within 15 minutes. Thank you for your continue patience and understandingOct <var data-var='date'>17</var>, <var data-var='time'>10:44</var> BST Monitoring - Dear Customers, We have identified the root cause of the problem and are actively working on a resolution. We will provide the next update within 15 minutes. Mail sending and receiving may continue to be unavailable – other system capabilities remain unaffected. Thank you for your continued patienceOct <var data-var='date'>17</var>, <var data-var='time'>10:19</var> BST Identified - Dear Customers, We’ve identified the cause of the issue affecting the mail flow. Our engineers are working on a fix and we’ll share another update once it’s resolved. Thank you for your patience.Oct <var data-var='date'>17</var>, <var data-var='time'>09:30</var> BST Update - Dear Customers, Our engineering team continues to investigate the issue affecting customers who are experiencing mail flow issues We’re working to identify the root cause and will share further updates as soon as more information becomes available. Thank you for your continued patience.Oct <var data-var='date'>17</var>, <var data-var='time'>08:44</var> BST Investigating - Dear Customers, We’re aware that some customers are currently experiencing issues creating new mail and, in certain cases, receiving mail. Our engineering team is actively investigating and working to resolve the issue as quickly as possible. We’ll continue to provide updates as more information becomes available. Thank you for your patience and understanding.

Incident: Mail Creation and Delivery Issues on Dublin2 cluster

Aug <var data-var='date'>29</var>, <var data-var='time'>17:13</var> BST Resolved - This incident has now been resolvedAug <var data-var='date'>29</var>, <var data-var='time'>17:12</var> BST Update - Aug 29, 2025, 5:38 PM GMT+2 After monitoring the service and receiving confirmation from previously affected users, we’ve confirmed that impact has been remediated. The service will now resume periodic attempts to deliver emails that were sent during the impacted period. Issue details Issue ID: EX1144276 Affected services: Exchange Online Status: Service restored Start time: Aug 29, 2025, 12:36 PM GMT+2 End time: Aug 29, 2025, 5:10 PM GMT+2 Issue type: IncidentAug <var data-var='date'>29</var>, <var data-var='time'>16:00</var> BST Update - Aug 29, 2025, 4:38 PM GMT+2 The new throttling rule has successfully been deployed. We’ve received confirmation from some of the previously affected users that they can now send and receive email. Additionally, our telemetry shows that the new throttling rule is having the desired effect and providing relief. Next update by: Friday, August 29, 2025 at 6:00 PM GMT+2Aug <var data-var='date'>29</var>, <var data-var='time'>14:36</var> BST Investigating - As per Microsoft: ID: EX1144276 Issue type: Incident Status: Service Degradation Impacted services: Exchange Online Details: Title: Users may experience delays sending and receiving email messages User impact: Users may experience delays sending and receiving email messages. Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix. Scope of impact: Some users who are located in Europe attempting to send or receive Exchange Online email messages may be impacted. Next update by: Friday, August 29, 2025, at 2:30 PM UTC

Microsoft Incident - Users may experience delays sending and receiving email messages

Jul <var data-var='date'>10</var>, <var data-var='time'>20:30</var> BST Completed - The scheduled maintenance has been completed.Jul <var data-var='date'>10</var>, <var data-var='time'>20:00</var> BST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.Jul <var data-var='date'> 7</var>, <var data-var='time'>18:38</var> BST Scheduled - Please be advised that we have scheduled a brief maintenance window for Thursday evening 10 July 2025, between 8:00 PM and 8:30 PM BST, during which a set of database instances will undergo routine updates. Databases affected: dublin2 dublin3 The maintenance will be staggered, and we anticipate minimal downtime of less than 1 minute per instance during this period.

Essential Maintenance on Dublin2 and Dublin3

May <var data-var='date'>21</var>, <var data-var='time'>21:00</var> BST Completed - The scheduled maintenance has been completed.May <var data-var='date'>20</var>, <var data-var='time'>18:30</var> BST Scheduled - We will be undergoing scheduled maintenance on 21 May at 20:00 BST, leading to a brief downtime of approximately 60 seconds.

Essential Maintenance on Dublin 2 and 3 Clusters

May <var data-var='date'>16</var>, <var data-var='time'>22:30</var> BST Resolved - 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.May <var data-var='date'>16</var>, <var data-var='time'>10:00</var> BST Monitoring - 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 availableMay <var data-var='date'>15</var>, <var data-var='time'>09:10</var> BST Investigating - 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

Issue Identified: Automatic Forwarding Failures in Exchange Online

Apr <var data-var='date'>23</var>, <var data-var='time'>13:13</var> BST Resolved - This incident has been resolved.Apr <var data-var='date'>23</var>, <var data-var='time'>13:10</var> BST Monitoring - A fix has been implemented and we are monitoring the results.Apr <var data-var='date'>23</var>, <var data-var='time'>13:03</var> BST Identified - The issue has been identified and a fix is being implemented.Apr <var data-var='date'>23</var>, <var data-var='time'>12:58</var> BST Investigating - An application outage has been identified and is affecting customers on Dublin 1 infrastructure. Affected users are unable to log into or access the platform. The issue is under investigation by engineering as an emergency.

Application Outage: Customers on Dublin 1 are unable to access Sedna

Apr <var data-var='date'>18</var>, <var data-var='time'>10:20</var> BST Resolved - This incident has been resolved and our Engineers are continuing to monitor the situation.Apr <var data-var='date'>18</var>, <var data-var='time'>09:50</var> BST Monitoring - A fix has been implemented and we are monitoring the results.Apr <var data-var='date'>18</var>, <var data-var='time'>08:40</var> BST Investigating - We are currently investigating this issue.

Customers on Dublin 2 Are Experiencing Performance Issues

Mar <var data-var='date'> 3</var>, <var data-var='time'>22:05</var> GMT Completed - The scheduled maintenance has been completed.Mar <var data-var='date'> 3</var>, <var data-var='time'>22:00</var> GMT Update - We will be undergoing scheduled maintenance during this time.Mar <var data-var='date'> 3</var>, <var data-var='time'>22:00</var> GMT Scheduled - To ensure continued performance and reliability, our Engineering team will be carrying out essential maintenance on the Dublin 2 cluster today between 10:00 pm and 11:00 pm BST. As part of this, a database restart will be required, leading to a brief downtime of approximately 10 minutes. Due to the nature of this maintenance, we are unable to provide the standard 72-hour notice. We understand this may cause inconvenience, and we sincerely apologize for the short notice. This maintenance is necessary to improve platform performance and we appreciate your patience as we carry out this necessary work to maintain our strong service standards.

Essential Maintenance on Dublin 2 Cluster

Mar <var data-var='date'> 3</var>, <var data-var='time'>18:38</var> GMT Resolved - This incident has been resolved.Mar <var data-var='date'> 3</var>, <var data-var='time'>13:45</var> GMT Monitoring - A fix has been implemented, and mail ingest has been resolved. We are currently monitoring the delayed auto-tagging of the affected messages.Mar <var data-var='date'> 3</var>, <var data-var='time'>13:34</var> GMT Investigating - Customers on our Dublin 3 cluster are experiencing a temporary delay in receiving mail. The issue is under investigation by engineering as an emergency.

Mail Ingest and Auto Tagging Delay: Dublin 3

Mar <var data-var='date'> 3</var>, <var data-var='time'>18:26</var> GMT Resolved - This incident has been resolved.Mar <var data-var='date'> 3</var>, <var data-var='time'>17:22</var> GMT Investigating - An application outage has been identified and is affecting all customers on Dublin 3. Affected users are unable to log into or access the platform. The issue is under investigation by engineering as an emergency.

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Sedna Systems status is UP

Lastest published events

Dublin2 Performance Issues

Mail Delay : Dublin 2

Mail Ingress & Egress Delay : Global

Sedna Systems Services, Components and Regions

Recent Sedna Systems events

Dublin2 Performance Issues

Mail Delay : Dublin 2

Mail Ingress & Egress Delay : Global

Mail Ingress & Egress Outage: Some Customers in EU Clusters unable to Send and Receive Mail

Microsoft Outage

Mail Flow Delay: Virginia1 Cluster

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Is Sedna Systems down?

Sedna Systems status is UP

Lastest published events

Dublin2 Performance Issues

Mail Delay : Dublin 2

Mail Ingress & Egress Delay : Global

Sedna Systems Services, Components and Regions

Recent Sedna Systems events

Dublin2 Performance Issues

Mail Delay : Dublin 2

Mail Ingress & Egress Delay : Global

Mail Ingress & Egress Outage: Some Customers in EU Clusters unable to Send and Receive Mail

Microsoft Outage

Mail Flow Delay: Virginia1 Cluster

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