After continued monitoring, we have confirmed the issue is no longer occurring. Servers that were displaying errors have been removed and replaced within our UK region to prevent the issue from reoccurring.
If you are still seeing issues with mail flow when using Exclaimer at this time, please reach out to our support team directly, who will be happy to help.
Posted Jun 10, 2026 - 15:43 UTC
Monitoring
Exclaimer Engineers have confirmed that the error rate is now dropping after a spike in both UK regions, suggesting that other actions taken have been able to address the issue. We are continuing to look into the cause whilst monitoring for any further issues.
Posted Jun 10, 2026 - 15:02 UTC
Update
Exclaimer Engineers have made a change in the UK region to prevent messages from being delivered to the affected servers. This should prevent further messages from being impacted and ensure that impacted messages are processed as expected on the next attempt.
Posted Jun 10, 2026 - 14:52 UTC
Investigating
Exclaimer Engineers are aware of an issue that may cause messages to be delayed when sent to Exclaimer Cloud for Microsoft 365 users in the UK.
More information will be provided once it is available.
Posted Jun 10, 2026 - 14:45 UTC
This incident affected: UK (UK: Server-Side: Mail Routing - Office 365).