Is Exclaimer Down?

Microsoft has confirmed the incident on their side is fully resolved, and our own monitoring shows mail delivery to Microsoft 365 (Outlook) recipients has returned to normal across all regions. All previously delayed emails have now been delivered. No further action is needed on your part. We consider this matter resolved, and thank our customers for their patience throughout. --- [2026-11-13T09:46:48.712Z] (monitoring) Microsoft has advised that it is seeing 'early signs of stabilization' after its last attempted resolution, but noted that service has not yet returned to normal levels. You can follow Microsoft’s progress under EX1550543 and MO1550821 in the Microsoft 365 admin center, or at https://status.cloud.microsoft/ Exclaimer Engineers are continuing to monitor the issue closely for any changes or any actions we can take and to reduce further delays once the impact to Exchange Online has been resolved. What this means for you: - No action is needed from you at this time. Once we have the email, we will be able to apply a signature as expected, provided the Exclaimer Rule is still enabled within Exchange Online. - Delayed emails are not lost. They are currently being retried automatically and will be delivered as soon as possible. You may see a burst of delayed mail arriving at once during the day. - Microsoft is giving emails more time to try to be sent after the issue, this means any messages you tried to send before will likely still be delivered even if they were sent when the issues began. Resending can lead to duplicates when the original messages are delivered. --- [2026-11-13T00:39:45.817Z] (monitoring) Exclaimer engineers have continued to monitor the Microsoft incidents (MO1550821 and EX1550543) overnight for any signs of improvement in Microsoft's own mitigation actions. At this time the incident looks to be ongoing and we are continuing to monitor for any action we can take and to reduce further delays once the impact to Exchange Online has been resolved. Currently, impacted emails are delayed, they will be automatically retried for delivery. This means no action is needed from you at this time; once we have the email, we will be able to apply a signature as expected. --- [2026-11-12T19:38:10.496Z] (investigating) We are continuing to monitor the impact of this issue as Microsoft works to mitigate it. --- [2026-11-12T18:51:14.403Z] (investigating) We’re seeing delays delivering emails to Microsoft 365 (Outlook) recipients across all regions, due to an issue on Microsoft’s side affecting their mail infrastructure. Emails are delayed and being automatically retried, not lost. No action is needed from you. We’re monitoring and will post updates as we learn more.

Engineers have confirmed that the previous service alert has been resolved. The service is now back to full health and is working as normal. Thank you for your patience. --- [2026-10-27T20:33:43.340Z] (monitoring) Auto synchronisation has been restored and is expected to run according to its configured schedule. We are continuing to monitor subsequent synchronisation runs to ensure its functioning as expected --- [2026-10-27T12:09:14.404Z] (monitoring) Exclaimer Engineers have been able to address the issue preventing Data synchronisations from running, and we have now enabled manual synchronisation again. Users who see an 'In Progress' status on the Sender Management page within the portal will be able to start a new Sync using the 'Start Sync' option to allow Exclaimer to obtain the latest user data. If you are continuing to experience issues, or see an error message appear, please contact our support team who will be happy to help. --- [2026-10-26T16:37:49.022Z] (investigating) Exclaimer Engineers are continuing work to address the impacted service. Please note that any user data previously synchronized with Exclaimer will remain unaffected. However, any updates to user information or the addition of new users will not be reflected in signatures until the issue is resolved. --- [2026-10-26T15:37:56.617Z] (investigating) We’ve identified an issue affecting directory synchronisation for customers in the EU region. Synchronisation is temporarily paused while our engineers resolve it. User data that was already synced shouldn’t be affected, but changes to user data and newly added users won’t sync until it resumes, and the Synchronise button in the portal may stay on “In progress”. Customers setting up Exclaimer for the first time will also be affected, because their initial user sync won’t complete until then. We’re aiming to restart synchronisation tonight, and we expect data to be up to date by the morning of 27 October. This is our current estimate, and we’ll post an update as soon as syncing has resumed.

Exclaimer Engineers have confirmed that the incident has been resolved. The issue was caused by a Cloudflare incident (https://www.cloudflarestatus.com/incidents/ryvhi2suec0d) affecting connectivity between Cloudflare and Azure that prevented routing traffic to one of our available UAE Datacenters, which remained healthy throughout. Exclaimer Engineers worked around the issue by routing traffic away from the impacted route until Cloudflare had resolved the issue and all traffic is now routing as normal following testing and a period of extended monitoring. If you have any questions or concerns, please reach out to our great support team, who will be more than happy to help answer any questions. --- [2026-10-06T15:02:26.193Z] (monitoring) The cause of the issue has been identified, and mitigation has been applied to restore full access to the User Interface for impacted customers. --- [2026-10-06T12:57:58.161Z] (monitoring) We've restored access to the Exclaimer admin portal and management pages for the UAE region by redirecting traffic to our secondary UAE infrastructure. Our checks show the pages loading normally again. We're continuing to monitor while we investigate the underlying cause. Email signature delivery wasn't affected. We'll post another update when we have more information. --- [2026-10-06T12:40:47.218Z] (identified) Exclaimer Engineers are taking action to restore the service to full operation at this time. We have been able to confirm that signatures being applied through Client-side and Server-side methods are continuing to apply as expected. --- [2026-10-06T12:17:05.172Z] (investigating) Exclaimer Engineers are aware of a possible issue that is preventing some subscriptions from accessing the Exclaimer Portal. The cause is currently being investigated, and more information will be shared shortly.

Exclaimer engineers will be testing the resilience of the Exclaimer platform with planned high-volume failover testing. There is no expected impact on any Exclaimer services during this maintenance testing window, as preparations have been made to mitigate any impact during this timeframe. In the event of any unexpected incidents or service disruptions in the run-up to this maintenance action, the task will be rescheduled to a later date.

Exclaimer engineers will be testing the resilience of the Exclaimer platform with planned high-volume failover testing. There is no expected impact on any Exclaimer services during this maintenance testing window, as preparations have been made to mitigate any impact during this timeframe. In the event of any unexpected incidents or service disruptions in the run-up to this maintenance action, the task will be rescheduled to a later date.