KnowBe4 incident
Protect - Intermittent Issues with Sending Emails (UK Only)
Resolved after 5 hours 38 minutes, affecting Mail Flow, on May 27, 2026.
On Wednesday, May 27, 2026, from approximately 09:22 to 15:24 \(UTC\), some UK customers experienced intermittent issues with outbound email delivery in Protect. This issue was caused by a configuration change that disrupted outbound email processing. Affected emails failed to send and were instead held in a delivery queue. To resolve this issue, our team temporarily rerouted traffic while investigating the root cause and then updated the affected configuration. After the configuration was updated, all queued messages were delivered, and Protect returned to normal performance by 15:24 \(UTC\). To prevent this type of issue in the future, we are integrating the configuration update into future deployments. We are also improving monitoring to detect similar disruptions more quickly. No data loss occurred as a result of this issue.
Affected components
Update timeline
- investigating May 27, 2026, 10:05 AM UTC
We have received reports that there is a Intermittent issue sending emails for Protect. We are investigating this issue and will update this page when we have more information.
- monitoring May 27, 2026, 02:39 PM UTC
We’ve implemented a fix and we’re monitoring the results to make sure no further issues occur.
- resolved May 27, 2026, 03:44 PM UTC
This incident has been resolved.
- postmortem Sep 16, 2026, 01:47 PM UTC
On Wednesday, May 27, 2026, from approximately 09:22 to 15:24 \(UTC\), some UK customers experienced intermittent issues with outbound email delivery in Protect. This issue was caused by a configuration change that disrupted outbound email processing. Affected emails failed to send and were instead held in a delivery queue. To resolve this issue, our team temporarily rerouted traffic while investigating the root cause and then updated the affected configuration. After the configuration was updated, all queued messages were delivered, and Protect returned to normal performance by 15:24 \(UTC\). To prevent this type of issue in the future, we are integrating the configuration update into future deployments. We are also improving monitoring to detect similar disruptions more quickly. No data loss occurred as a result of this issue.
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