Is Tessian down?

Status: Identified We are currently investigating an issue causing delays in live syncing. As a result Email Misdelivery, Exfiltration Protection and Core Email Protection API may experience reduced classification accuracy. Additionally, Core Email Protection API checks are experiencing delays which may result in some missed flags. Our engineering team is actively working to identify the root cause and restore normal service. We will provide further updates as more information becomes available. Affected components Core Email Protection API (Degraded performance) Core Email Protection API (Degraded performance) AEDLP Email Misdelivery Protection (Degraded performance) M365 Add-in (Degraded performance) AEDLP Email Exfiltration Protection (Degraded performance)

Status: Monitoring As of 18:18 UTC, all systems are operating within expected limits. Our teams remain actively engaged in monitoring the environment. We appreciate your patience and understanding. If you have further questions or concerns, we'd encourage you to open a Support Case for further assistance. Affected components M365 Add-in (Operational) AEDLP Email Exfiltration Protection (Operational) Core Email Protection API (Operational) Core Email Protection API (Operational) AEDLP Email Misdelivery Protection (Operational)

Status: Resolved After continued monitoring, for the last 48 hours all systems remain stable. Affected components Core Email Protection API (Operational) Core Email Protection API (Operational) AEDLP Email Misdelivery Protection (Operational) M365 Add-in (Operational) AEDLP Email Exfiltration Protection (Operational)

Status: Monitoring We identified an issue impacting a subset of customer's Adaptive Email DLP Gateway. Impacted customers may have experienced a delay in end users receiving Held email notifications. Impact: • Starting July 22nd 2026 ~10:00 UTC, when an email triggered a policy and was held by the Adaptive Email DLP Gateway, the end user (sender) may not have received a timely notification that their email was held by the Gateway. • This would delay users from replying to the Held email notification and releasing the original email to the intended recipient. Proofpoint Engineering identified the issue and deployed a fix. Through close monitoring, we see new email held notifications sending without delay, and previously delayed notifications being delivered. We will continue to monitor to ensure all end user notifications are being sent as expected. Please feel free to open a support ticket with any additional questions or concerns. Affected components Gateway (Degraded performance)

Status: Monitoring Proofpoint continues to monitor, and has seen no reoccurrence of the initial issue. On our US Server, during recovery later on July 22nd, we observed intermittent delays with users releasing emails, where replies did not process right away, which have now been fully resolved. We have identified a lingering cosmetic issue within customer portals. Under the Gateway > Monitoring tab, customers may observe an abnormally high number of "Pending delivery" emails back to their mail server. • Emails which were held during the initial issue are incorrectly showing in this tab. • Checking our backend mail logs, we can confirm these emails have been successfully delivered back to your server, even though they may still show in the UI. • Customers are welcome to double check by doing a mail trace against the message ID We are currently working on a fix, and will hold this open in a monitoring state until the number of Pending delivery entries is corrected in customer portals is corrected. Affected components Gateway (Operational)

Status: Resolved As of 10:00 UTC July 24th 2026 - the remaining UI issue with the "Pending delivery" tab incorrectly showing emails which had already been delivered has been resolved. Please feel free to open a case with any additional questions and concerns. Affected components Gateway (Operational)

Status: Investigating We are currently investigating issues logging into portals on our US Server. What attempting to access your platform, you may receiving the following error "503 Service Temporarily Unavailable". Proofpoint Engineering is actively engaged and investigating. Affected components Proofpoint Portal (Partial outage)

Status: Identified We are seeing signs of recovery, and portals are once again accessible. Proofpoint Engineering is continuing to investigate and monitor to ensure a full and stable recovery. We will continue to update as more information becomes available. Affected components Proofpoint Portal (Operational)

Status: Resolved As of 16:15 UTC, Portal Access has fully recovered and we remain stable. If you have not done so already, please feel free to a support case for additional information as needed. Affected components Proofpoint Portal (Operational)

Status: Monitoring One of the detection services utilized by CEPAPI is currently experiencing delays. Emails are still being processed, checked, and actioned, but a subset of the detection stack may take up to 5-10 mins to complete analysis. Our team is actively investigating and monitoring the issue and will provide updates as more information becomes available. Affected components Core Email Protection API (Degraded performance)

Status: Resolved As of 22:30 UTC, all systems are functioning normally and impacted detection services are scanning emails without delay after remedial action by Proofpoint Engineering. Please feel free to open a support case if you have any additional questions or concerns. Affected components Core Email Protection API (Operational)

Status: Monitoring Proofpoint investigated elevated error rates processing inbound and outbound emails on our US Server. On June 12 2026 from 14:30 UTC to 16:19 UTC, ~2% of emails sent or received failed to process. Proofpoint Engineering have remediated the issue, and is currently monitoring. For Core Email Protection API - this mean impacted inbound emails were not initially submitted for scoring, did not create a security event, and could not be found in Investigation & Respond. Missed emails are currently being re-submitted, effectively translating to a delay in processing and remediation where applicable. For Adaptive Email DLP - this means reporting for M365 add-in user responses may be temporarily inaccurate on the timeline of a security event. A small percentage of checks done by the M365 Add-in quickly timed out and failed open during the impact window. For customers using the Gateway, these check would have been routed to and completed by the Gateway. Affected components Core Email Protection API (Degraded performance) M365 Add-in (Degraded performance) Reported Emails (Degraded performance) Investigate and Respond - Email Search (Degraded performance)

Status: Resolved After continued monitoring, all systems remain healthy. Please feel free to open a support case if you have additional questions. Affected components Core Email Protection API (Operational) M365 Add-in (Operational) Reported Emails (Operational) Investigate and Respond - Email Search (Operational)