Outage in Exclaimer
Some messages are marked Undeliverable 'blocked using Spamhaus'
Resolved MinorIncident Report
Exclaimer Engineers are aware of an ongoing issue where one of our Server IPs looks to have been added to the Spamhaus eXploits Blocklist on multiple occasions.
Spamhaus is advising that the IP has already been removed from the List. Our engineering team is currently investigating the issue for more information.
Components affected
Exclaimer Mail Routing - Office 365Trusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
3 months ago - at 01/19/2026 08:56PM
This incident has been resolved, and a Postmortem will be provided shortly.
MONITORING
4 months ago - at 01/09/2026 04:32PM
After monitoring mail flow through Exclaimer, we have confirmed there's been no further messages reported as blocked due to the Spamhaus Blocklist since 14:53GMT.
Exclaimer Engineers have reached out to Spamhaus to discuss the issue at this time and to obtain more information on the resulting action that added this IP to the blocklist.
INVESTIGATING
4 months ago - at 01/09/2026 02:51PM
Exclaimer Engineers are aware of an ongoing issue where one of our Server IPs looks to have been added to the Spamhaus eXploits Blocklist on multiple occasions.
Spamhaus is advising that the IP has already been removed from the List. Our engineering team is currently investigating the issue for more information.
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