Outage in Exclaimer
UK Server-side IP appearing on Sender Score Return Path Blocklist
Resolved MinorIncident Report
Exclaimer Engineers are aware of a relay IP address within the UK having been added to the Sender Score Return Path Blocklist. The IP is no longer reporting as being on this list. We have reached out to obtain more information.
Client-side signatures are unaffected by this issue.
If you are experiencing issues with mail flow at this time, we advise you to disable the Exclaimer Mail flow rule within the Exchange Admin Center and to contact our support team who will be more than happy to help.
Components affected
Exclaimer Mail Routing - Office 365Need to monitor Exclaimer outages?
- Monitor all your external dependencies in one place
- Get instant alerts when outages are detected
- Be the first to know if service is down
- Show real-time status on private or public status page
- Keep your team informed
Latest Updates ( sorted recent to last )
RESOLVED
6 days ago - at 02/03/2026 12:06PM
No issues have occurred since our last update, and we will now mark this incident as resolved.
If you require any assistance, please contact our support team, who will be more than happy to help.
MONITORING
6 days ago - at 02/02/2026 03:11PM
Monitoring has indicated there has been no impact from the listing, and the IP has not been added back onto the list at this time. Our Engineers will continue to monitor for any further reports.
INVESTIGATING
6 days ago - at 02/02/2026 02:18PM
Exclaimer Engineers are aware of a relay IP address within the UK having been added to the Sender Score Return Path Blocklist. The IP is no longer reporting as being on this list. We have reached out to obtain more information.
Client-side signatures are unaffected by this issue.
If you are experiencing issues with mail flow at this time, we advise you to disable the Exclaimer Mail flow rule within the Exchange Admin Center and to contact our support team who will be more than happy to help.
Latest Exclaimer outages
Exclaimer Cloud Portal not loading as expected - 4 days ago
Message delivery issues - 6 days ago
Client-side signature Reporting Issue - 12 days ago
Some messages are marked Undeliverable 'blocked using Spamhaus' - about 1 month ago
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 5850 services available
Integrations with
