Multiple signatures appearing in some messages
Update - Exclaimer Engineers have made a change to signature generation to help prevent the issue from occurring for client-side signatures.

We are continuing to raise the issue with Microsoft to gain a more in-depth understanding of the problem.
Apr 17, 2026 - 09:42 UTC
Identified - Exclaimer Engineers have been able to identify changes being made by Outlook when the email signature is applied, and then the email is saved as a draft. Resulting in a secondary signature being applied server-side if this is also enabled.

The issue is being raised with Microsoft directly to understand this behavioural change further.
Apr 16, 2026 - 15:23 UTC
Investigating - Exclaimer engineers are currently investigating a problem where signatures are being applied to messages even though a signature is already present on the most recent message.

The issue does not appear to be impacting all mail at this time.

We will provide more information as it becomes available.
Apr 15, 2026 - 11:03 UTC
Uptime over the past 90 days. View historical uptime.
Australia Operational
90 days ago
100.0 % uptime
Today
AU: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
AU: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
AU: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
AU: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
AU: Client-Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
AU: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
AU: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
AU: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
AU: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
AU: Feedback Operational
90 days ago
100.0 % uptime
Today
Canada Operational
90 days ago
100.0 % uptime
Today
CA: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
CA: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
CA: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
CA: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
CA: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
CA: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
CA: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
CA: Feedback Operational
90 days ago
100.0 % uptime
Today
Europe Operational
90 days ago
100.0 % uptime
Today
EU: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
EU: Server-Side: Mail routing - Google Workspace Operational
90 days ago
100.0 % uptime
Today
EU: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
EU: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
EU: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
EU: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
EU: Client Side: Signature Application - Google Workspace Operational
90 days ago
100.0 % uptime
Today
EU: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
EU: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
EU: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
EU: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
EU: Feedback Operational
90 days ago
100.0 % uptime
Today
Germany Operational
90 days ago
99.99 % uptime
Today
DE: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
DE: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
DE: Server-Side: Signature Application Operational
90 days ago
99.98 % uptime
Today
DE: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
DE: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
DE: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
DE: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
DE: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
DE: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
DE: Feedback Operational
90 days ago
100.0 % uptime
Today
UAE Operational
90 days ago
100.0 % uptime
Today
UAE: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
UAE: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
UAE: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
UAE: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
UAE: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
UAE: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
UAE: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
UAE: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
UAE: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
UAE: Feedback Operational
90 days ago
100.0 % uptime
Today
UK Operational
90 days ago
100.0 % uptime
Today
UK: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
UK: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
UK: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
UK: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
UK: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
UK: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
UK: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
UK: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
UK: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
UK: Feedback Operational
90 days ago
100.0 % uptime
Today
US Operational
90 days ago
100.0 % uptime
Today
US: Server-Side: Mail Routing - Office 365 Operational
90 days ago
100.0 % uptime
Today
US: Server-Side: Mail Routing - Google Workspace Operational
90 days ago
100.0 % uptime
Today
US: Server-Side: Mail Routing - Exchange Operational
90 days ago
100.0 % uptime
Today
US: Server-Side: Signature Application Operational
90 days ago
100.0 % uptime
Today
US: Server-Side: Sent Items Update Operational
90 days ago
100.0 % uptime
Today
US: Client Side: Signature Application - Office 365 Operational
90 days ago
100.0 % uptime
Today
US: Client Side: Signature Application - Google Workspace Operational
90 days ago
100.0 % uptime
Today
US: Data: User Synchronization Operational
90 days ago
100.0 % uptime
Today
US: UI: Admin User Interface Operational
90 days ago
100.0 % uptime
Today
US: UI: New Customer Onboarding Operational
90 days ago
100.0 % uptime
Today
US: Analytics: Click Tracking Operational
90 days ago
100.0 % uptime
Today
US: Feedback Operational
90 days ago
100.0 % uptime
Today
UI: Authentication and Billing Portal Operational
90 days ago
100.0 % uptime
Today
Client-Side: Outlook Add-In Deployment Operational
90 days ago
100.0 % uptime
Today
Third-Party: Zoom Meeting Branding Operational
Zoom Meetings Operational
Zoom Marketplace Operational
Zoom REST API Operational
Zoom Web SDK Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

System Metrics Month Week Day
Average Client Side Duration ?
Fetching
Average Server Side Duration ?
Fetching
Apr 21, 2026

No incidents reported today.

Apr 20, 2026

No incidents reported.

Apr 19, 2026

No incidents reported.

Apr 18, 2026

No incidents reported.

Apr 17, 2026
Issues accessing Exclaimer Portal
Resolved - An unexpected bad release of the Exclaimer Cloud Portal was able to be deployed to regions, preventing the Portal from being accessible to allow users to configure signatures or complete the Exclaimer onboarding.

Automated rollbacks detected the error and reverted to the previous healthy version. An internal investigation was able to identify the cause of the bad release being able to be deployed to our systems, and further checks have been implemented to prevent future occurrences.
Apr 17, 07:00 UTC
Apr 16, 2026
Possible Routing issues within MEA & US region for Microsoft Customers
Postmortem - Read details
Apr 20, 18:14 UTC
Resolved - After extended monitoring, we are no longer seeing any issues impacting customers within these regions that would cause the issue initially reported at this time.

We continue to reach out and discuss the incident with Microsoft, and will provide a Postmortem review once we have received completed feedback from them regarding this issue.
Apr 16, 18:57 UTC
Monitoring - Exclaimer Engineers are continuing to monitor the situation at this time. The rate of messages being deferred due to the connecting server failing to provide the email has dropped substantially as well since Monday.

We are continuing to reach out to Microsoft to discuss the issue and obtain a complete understanding of it, and to confirm that the issue has been addressed.
Apr 8, 10:43 UTC
Update - Error rates have continued to decrease, and we’re now seeing minimal errors across both the MEA and US regions.
We’re still actively working with Microsoft to better understand the root cause, overall impact, and confirmation of the fix.

If the issue continues for any affected users, disabling the Exclaimer transport (mail flow) rule remains a valid temporary workaround.
Apr 7, 01:18 UTC
Update - We are continuing to work on a fix for this issue.
Apr 6, 01:45 UTC
Update - We are seeing continued improvements in mail flow performance. We are currently working with Microsoft to confirm whether their fix has been fully deployed.

Error rates have decreased, and we are no longer observing issues in the MEA region. However, some customers in the US region are still experiencing impact.

At this time, the mail flow rule disablement workaround can be safely reverted for customers who previously applied it to avoid delays.
For customers who are still experiencing the issue, or encounter any new occurrences, we recommend disabling the Exclaimer transport rule (mail flow rule) as a temporary workaround.

We will continue monitoring the situation closely and will provide further updates once we receive confirmation from Microsoft.
Apr 6, 01:44 UTC
Identified - Exclaimer Engineers are continuing to investigate issues affecting customers in the MEA region who are facing delays or deferrals when sending emails.

Our findings indicate that Exclaimer itself is functioning properly in the region, and successful connections are being established for all incoming messages. Occasionally, we notice that our monitoring systems initiate a connection but then disconnect before completing the message transfer. Since these cases don't reach our servers, it suggests that the problem is likely outside of Exclaimer's framework, occurring when the sending email server attempts to route messages.

We have contacted Microsoft to further investigate the situation.

For customers experiencing delays in mail flow, an immediate workaround is to disable the Exchange Mail Flow rules. Despite the delays, we confirm that all messages are eventually being processed by Exclaimer as expected.
Apr 4, 14:44 UTC
Investigating - Exclaimer Engineers are investigating a possible issue for customers in the MEA region who are unable to route emails to Exclaimer for Server-Side signatures, with messages being deferred and delayed.

Emails are continuing to be processed. If any possible sending delay needs to be avoided, you can disable the Mail flow rules for Exclaimer Cloud within the Exchange Admin Center.

This does not look to impact all customers within the region. More information will be provided when available.
Apr 4, 10:00 UTC
Apr 15, 2026
Apr 14, 2026

No incidents reported.

Apr 13, 2026

No incidents reported.

Apr 12, 2026

No incidents reported.

Apr 11, 2026

No incidents reported.

Apr 10, 2026

No incidents reported.

Apr 9, 2026

No incidents reported.

Apr 8, 2026
Apr 7, 2026
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