Exclaimer had 34 outages in the last 2 years totaling 254h 44m of downtime — averaging 1.4 incidents per month.
There were 34 Exclaimer outages since August 12, 2025 totaling 254h 44m of downtime. Each is summarised below — incident details, duration, and resolution information.
Distributors to the Exclaimer Cloud system may have experienced issues provisioning new subscriptions until 9:30 GMT on the 12th November. This issue impacted a small percentage of global requests that were submitted to the system. Any requests that failed to be processed would need to be resubmitted if they have not been successful.
Exclaimer engineers are aware of an issue that is impacting the Azure Front Door service which is having an impact on services such as the Exclaimer Add-in, Exclaimer Meeting Branding, or when attempting to download some files from our Website. More information can be seen on Microsoft's Azure Status page: https://azure.status.microsoft/en-gb/status We are actively monitoring the situation and will provide updates as this progresses.
Microsoft has advised the following information "We understand that this is due to a dependency on some underlying Kubernetes instances which crashed, we have been restarting these underlying Kubernetes instances and these instances coming back online." Microsoft believes the issue will be resolved in the next 90 minutes for all impacted customers. Our internal monitoring is indicating that the number of warnings has reduced as well. Another update will be provided once we have confirmation that the issue is fully resolved.
Microsoft has successfully recovered 96% of impacted resources, and services are no longer displaying errors as expected. Exclaimer Engineers are monitoring for any remaining issues that may be caused by this incident.
Microsoft has addressed the primary issue, and Exclaimer Engineers are continuing to monitor for any further issues.
Microsoft have now declared the issue as resolved. We have reached out to Microsoft to request further details for the post-mortem.
Exclaimer's Support team is aware of an issue that caused an Undeliverable message to be received when replying to an existing ticket. The problem should no longer be occurring; however, we are still investigating the cause. You can log in to our support portal directly to access your current tickets and respond to the associated Support Engineer using the steps within this guide: https://support.exclaimer.com/hc/en-gb/articles/9389259466141
Exclaimer Support is continuing to work on issues that are causing some messages sent in response to support tickets to return an undeliverable message. The issue has been escalated to our service provider to investigate further, as initial remedial action hasn't addressed the issue. Customers can continue to log in to the support portal directly to update tickets and ensure a response is received by our Support Team. Steps on how to login and access your tickets can be found here: https://support.exclaimer.com/hc/en-gb/articles/9389259466141
Exclaimer has implemented a temporary fix to address the issue being seen, which will allow for future messages to be replied to without messages returning an undeliverable message. Messages sent by the support team earlier may still be impacted and return an undeliverable when replied to. If needed, you can log in to our support portal directly to access your current tickets and respond to the associated Support Engineer using the steps within this guide: https://support.exclaimer.com/hc/en-gb/articles/9389259466141
After extended monitoring, we have verified that the changes made to resolve the issue have been implemented with a positive effect, and our support system provider has confirmed that there have not been any new instances of messages failing to deliver since the end of last week.
Exclaimer Engineers are currently investigating an issue where the Signature designer is not loading as expected. Signatures are still expected to be applying through client-side or server-side systems.
Our engineers have implemented a fix and we're actively monitoring the site. Customers should be able to access the signature designer as normal.
This incident has been resolved.
Microsoft is investigating an issue in Europe where some users may experience delays when sending and receiving email messages. For more details, please look for EX1144276 within the Microsoft admin center. The mail flow delays are not caused by any system provided by Exclaimer, but we will continue to monitor the service and advise once we hear more. If you have any other questions or concerns, please reach out to our support team. They will be happy to help.
Exclaimer is continuing to monitor the issue at this stage. Customers who are unable to access the Admin Center for incident EX1144276 within Exchange Online can monitor the Microsoft 365 Status account on X for updates: https://x.com/msft365status/status/1961409977400132058
Exclaimer Engineers are beginning to see evidence that Microsoft Exchange is starting to recover, and previously deferred messages are now being sent and received as expected. Messages that had been routed to Exclaimer will be delivered with a signature as expected, once they are accepted by Microsoft Exchange. We've confirmed there is no impact to our systems and that Exclaimer continues to operate as expected. We will continue to monitor email flow for any signs of relapses in Exchange Online over the rest of the day.
Microsoft has announced that the service has now been restored, and any messages impacted will resume periodic attempts to be delivered at this stage. If you are seeing issues relating to signatures not being applied to messages as expected, please don't hesitate to reach out to our support team, who will be happy to help.
We are aware of reports that messages are not being delivered or appear in a Pending status when the message status is checked for customers within the US region. At this time, we do not believe the issue to be caused by any configuration or setting issues within Exclaimer itself. You can restore mail flow by temporarily disabling the Mail Flow rule for Exclaimer in your Exchange Online Admin Center. If you have any concerns or require assistance, please do reach out to our Support Team, who will be happy to help.
We've been closely monitoring the service for the past hour, and everything appears to be stable. Customers can now begin re-enabling their Exclaimer mail flow rules and resume using the service as normal. We appreciate your patience and understanding. We'll continue to monitor to ensure everything remains stable.
Microsoft has raised Issue ID EX1133879 for customers in North America, where mail flow may have been delayed by over an hour for the period that we had been monitoring the issue. After continued monitoring, we are confident the primary issue has been resolved. If you had disabled the Mail Flow rules for Exclaimer, then you can look to enable these when possible. If you are continuing to experience issues or have further questions, please don't hesitate to reach out, and we'll be happy to help!