Tessian Outage History

Status: Monitoring For impacted customers, we observed mail began to flow through their Tessian Gateway again sometime after 20:00 UTC. On Proofpoint's end, Engineering investigated, but saw no changes and no errors in logging. In fact, despite the mail logs saying the Tessian Gateway had refused the connection, we did not even see the attempts to connect reach our servers. In parallel, we were tracking an open Google Workspace incident related to Gmail: https://www.google.com/appsstatus/dashboard/incidents/224ozRqzW4sFBDK8hLnT Although the description and start time roughly lined up, there weren't enough details to say it was certainly the cause. However, with the most recent update, we see that they've applied mitigation and have since seen recovery. Based off the update timestamp, this would have started sometime after 20:03 UTC. Since the timeline of the Google incident aligns with recovery we've seen on our end, it appears this Google Incident is the cause. Proofpoint will continue to monitor, and look for additional information from Google to understand why this impacted the Tessian Gateway for Gsuite customers. Customers can observe the backlog of emails processing through their gateway in their portal under Integrations > Email Deployments > Gateway > Alerting Customers who disabled their routing rules, can consider re-enabling them as desired. Affected components Gateway (Partial outage)

Status: Monitoring Today, April 8th 2026, between 14:31 and 14:48 UTC, we experienced an issue impacting the visibility of Internal Emails in the Investigate & Respond tab of Core Email Protection API. Impact: • All emails received, sent internally, April 8th 2026 between 14:31 and 14:48 UTC. • These emails were successfully checked by Core Email Protection API. • If it triggered detection, a Security Event was successfully created and can be found in your portal. • Any associated remediation actions, such as Warn or Quarantined according to your configuration, were successfully actioned. • If you attempt to search for these internal emails in Investigate & Respond, it will not return any results. • External emails, or internal emails outside the impact window, will still show in I&R. The team took quick action to alleviate the issue and minimize the impact window. After thorough investigation, we've determined we will not be able to restore the missing emails. Proofpoint will continue to monitor closely overnight. Affected components Investigate and Respond - Email Search (Partial outage)

Status: Monitoring We are no longer seeing delays in CEPAPI Defender checks. Our team is continuing to monitor this issue. Affected components Core Email Protection API (Operational)