[Email] [German System / US System] - Analytics for recently sent out Emails not shown

Update timeline

1. identified Jan 16, 2026, 07:58 PM UTC

   We have identified the root cause for analytics not being shown for emails send out in the last 6 hours (starting 3:00 PM CET) and will now take steps to fix the issue. No data is lost and the analytics for the affected mails will be available again after this incident is resolved.

2. resolved Jan 16, 2026, 09:20 PM UTC

   The issue is resolved and analytics are shown again for the affected mails. We apologize for the inconvenience this has caused. Please get in touch with us at [email protected] in case you're still having any problems. We’re happy to help!

3. postmortem Jan 20, 2026, 01:46 PM UTC

   ## Summary As our investigation of the incident is complete, we would like to provide you with more detailed information about the incident that occurred on **January 16, between 03:00 p.m. and 10:20 p.m. \(CET\)**, leading to issues with the visibility of analytics data for sent emails. ## What happened The incident was triggered by a **database migration** that inadvertently impacted the synchronization of mail analytics. This caused a delay in the processing and display of performance metrics for emails sent during the affected window. Once the root cause was identified, our engineering team implemented a fix to restore data flow. We have confirmed that **no data was lost**; all analytics tracked during this period were successfully backfilled and are now visible. ## Impact Between **03:00 p.m. and 10:20 p.m. \(CET\)**, users were unable to view analytics for emails sent out during this window. While the emails were delivered successfully and recipient interactions were still being tracked by our systems, the data was not being rendered in the user interface. ## Future improvements To prevent similar occurrences and ensure system stability during maintenance, we will **implement a different strategy for updating data** to ensure a more performant migration and a **reasonable update duration**. Thank you for your patience and understanding while we work to improve our services and prevent future incidents. If you have any questions or concerns, please do not hesitate to reach out to our customer support team at [[email protected]](mailto:[email protected]).