Tessian experienced a minor incident on June 3, 2026 affecting Proofpoint API and Proofpoint Cloud Email Security Platform and 1 more component, lasting 20h 41m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jun 03, 2026, 01:38 PM UTC
Status: Investigating We are currently investigating the degradation of some features, including Silent outbound API and the Abuse Mailbox. The team is actively working to mitigate and we will follow up with more details soon. Affected components Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Degraded performance) Proofpoint Portal (Degraded performance)
- investigating Jun 03, 2026, 02:12 PM UTC
Status: Investigating Proofpoint Engineering is actively working to mitigate customer impact. We've engaged 3rd party support to address the cause, and will continue to update on progress. Full list of potential impact can be found here: https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-elements-of-Core-Email-Protection-API-and-Adaptive-Email-DLP-03-June-2026 Affected components Reported Emails (Degraded performance) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Core Email Protection API (Degraded performance) Proofpoint Portal (Degraded performance)
- identified Jun 03, 2026, 04:00 PM UTC
Status: Identified Proofpoint Engineering is continues to mitigate customer impact per item. We remain engaged 3rd party support to address the cause and resolve the overall issue. Full list of potential impact can be found here:https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-elements-of-Core-Email-Protection-API-and-Adaptive-Email-DLP-03-June-2026 Affected components Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Core Email Protection API (Degraded performance) Proofpoint Portal (Degraded performance) Reported Emails (Degraded performance)
- identified Jun 03, 2026, 08:44 PM UTC
Status: Identified The majority of customer symptoms have been manually mitigated by Proofpoint Engineering. We continue to work with 3rd party support to address the initial cause. Full list of potential impact can be found here: https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-elements-of-Core-Email-Protection-API-and-Adaptive-Email-DLP-03-June-2026 Affected components Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Core Email Protection API (Operational) Proofpoint Portal (Degraded performance) Reported Emails (Operational)
- monitoring Jun 03, 2026, 10:04 PM UTC
Status: Monitoring Working with 3rd party vendor support, Proofpoint was able to determine this was caused by a vendor side issue, who have since deployed a fix. The underlying third party issue has been resolved as of 21:30 UTC June 3rd 2026. Proofpoint is continuing to closely monitor a full recovery. Full list of potential impact can be found here: https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-elements-of-Core-Email-Protection-API-and-Adaptive-Email-DLP-03-June-2026 Affected components Proofpoint Portal (Degraded performance) Reported Emails (Operational) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Core Email Protection API (Operational)
- resolved Jun 04, 2026, 10:19 AM UTC
Status: Resolved Working with 3rd party vendor support, Proofpoint was able to determine this was caused by a vendor side issue, who have since deployed a fix. The underlying third party issue has been resolved as of 21:30 UTC June 3rd 2026. Full list of potential impact can be found here: https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-elements-of-Core-Email-Protection-API-and-Adaptive-Email-DLP-03-June-2026 Affected components Proofpoint Cloud Email Security Platform (Operational) Proofpoint API (Operational) Core Email Protection API (Operational) Proofpoint Portal (Operational) Reported Emails (Operational)