Status: Monitoring · Started: Nov 12, 2026 at 1:51 pm ET · Last update: Nov 13, 2026 at 4:46 am ET
What Exclaimer is reporting
Affected: EU: Server-Side: Mail Routing – Office 365, US: Server-Side: Mail Routing – Office 365, CA: Server-Side: Mail Routing – Office 365, UAE: Server-Side: Mail Routing – Office 365, AU: Server-Side: Mail Routing – Office 365, UK: Server-Side: Mail Routing – Office 365, DE: Server-Side: Mail Routing – Office 365
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.
Status timeline
- Nov 13, 2026 at 4:46 am ET · 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 EX155054…
- Nov 12, 2026 at 7:39 pm ET · 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…
What you can do now
- Check whether the problem is on your side: try another device or network, or the web version of the app.
- Avoid changing settings or reinstalling while Exclaimer is working on a fix. It usually does not help and can slow down recovery.
- Let your team know, and use a backup channel such as phone or text for urgent work.
- Follow the official updates on the Exclaimer status page.
Source: Exclaimer official status page. GoCloudii checks this automatically every few minutes and updates this post. See all services on our live status board.
