Postmortem
Summary

As our investigation of the incident is now complete, we would like to share more details about the issue that occurred between February 13, 11:15 AM CEST, and February 14, 08:30 AM CEST.

What happened

A bug in our email tracking functionality caused certain images in emails to be modified incorrectly during sending. As a result, some images could not be displayed when emails were delivered to recipients.

This issue only affected live email sends and did not impact test emails, which followed a different sending process.

Once the issue was identified, we implemented a mitigation to ensure tracking functionality would no longer interfere with image display. A permanent fix was then deployed to fully resolve the underlying problem.

Impact

During the specified timeframe, recipients of affected emails may have experienced missing images, such as header or content images, when viewing emails. This impacted the visual presentation of emails but did not affect email delivery itself.

Future Improvements

We are implementing measures to help prevent similar incidents in the future, including:

• Improving automated test coverage for email functionality
• Simplifying tracking logic to reduce complexity
• Enhancing monitoring and investigation capabilities

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We are sorry for the inconvenience this has caused.

Please contact us at support@staffbase.com if you have any further questions regarding this topic.