MxToolbox incident
MailFlow Monitoring Impacted by SpamHaus Blocklisting
Affected components
Update timeline
- identified Feb 13, 2026, 04:46 PM UTC
We are currently experiencing an issue with our MailFlow Monitoring being impacted by being listed on the SpamHaus blocklist. Our Team is working to have our IPs removed from this list. Due to the nature of our monitoring tools, some of our IP addresses may be listed occasionally on certain RBLs. These listings may cause issues with certain anti-spam appliances/security software and result in a mailflow test message to not be delivered. As we do our best to remove the listings promptly, we recommend you add our IP addresses as a safe/allowed sender to ensure mailflow tests are uninterrupted. 44.194.168.193/32 52.55.244.91/32 18.205.72.90/32 18.209.86.113/32 We apologize for the inconvenience.
- monitoring Feb 13, 2026, 06:38 PM UTC
Our IPs for MailFlow have just been removed from the SpamHaus listing...we are continuing to monitor the MailFlow connectivity issue that was being impacted by this listing.
- resolved Feb 13, 2026, 09:36 PM UTC
This incident has been resolved.
Looking to track MxToolbox downtime and outages?
Pingoru polls MxToolbox's status page every 5 minutes and alerts you the moment it reports an issue — before your customers do.
- Real-time alerts when MxToolbox reports an incident
- Email, Slack, Discord, Microsoft Teams, and webhook notifications
- Track MxToolbox alongside 5,000+ providers in one dashboard
- Component-level filtering
- Notification groups + maintenance calendar
5 free monitors · No credit card required