Is Tessian EU down?

Status: Investigating We are aware of an issue affecting EU portal logins on Google chrome. We are currently working with Google to have this reclassified as safe. At present, the issue appears limited to Google Safe Browsing, primarily impacting EU tenants. Other browsers, such as Safari and Firefox, are generally not affected, although some Safari users may see warnings depending on their security settings. Affected components Proofpoint Portal (Degraded performance)

Status: Investigating We are aware of an issue affecting EU portal logins on Google Chrome. We are currently working with Google to have this reclassified as safe. At present, the issue appears limited to Google Safe Browsing, primarily impacting EU tenants. Other browsers, such as Safari and Firefox, are generally not affected, although some Safari users may see warnings depending on their security settings. Please note that the site itself is not compromised, and this warning is due to a misclassification. Affected components Proofpoint Portal (Degraded performance)

Status: Identified Google has applied an Emergency Allowlist for the EU portals, which should immediately stop "Dangerous site" warnings from appearing to users in Chrome and other browsers using Google Safe Browsing. This action is a temporary fix while Google investigates the root cause of the false positive. Their product engineering team is working on a permanent resolution. Testing from multiple stakeholders now shows that the error is gone in Chrome, Safari, and Firefox. Google has also confirmed that the EU portal  is no longer listed as dangerous on their Transparency Report. We are checking with impacted customers to confirm the resolution from their side. Please report any continued issues so we can escalate with Google if needed. Affected components Proofpoint Portal (Degraded performance)

Status: Resolved Proofpoint has confirmed the Emergency Allowlist has resolved the issue for impacted customers. We will continue to work with Google to understand what caused the false positive and prevent such issues in the future. Please feel free to open a support case if you have any additional questions. 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: 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)

Status: Identified 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 Core Email Protection API (Degraded performance) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Proofpoint Portal (Degraded performance) Reported Emails (Degraded performance)

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 Core Email Protection API (Degraded performance) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Proofpoint Portal (Degraded performance) Reported Emails (Degraded performance)

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 Portal (Degraded performance) Reported Emails (Operational) Core Email Protection API (Operational) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational)

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 Reported Emails (Operational) Core Email Protection API (Operational) Proofpoint Cloud Email Security Platform (Degraded performance) Proofpoint API (Operational) Proofpoint Portal (Degraded performance)

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 Core Email Protection API (Operational) Proofpoint Cloud Email Security Platform (Operational) Proofpoint API (Operational) Proofpoint Portal (Operational) Reported Emails (Operational)

Status: Investigating We are aware of an issue with the Gateway journal servers at the moment. This problem is isolated to journaling and does not affect inbound or outbound mail delivery. Our teams are currently investigating, and we will follow up as soon as we have more information. Affected components Gateway (Partial outage)

Status: Identified The cause of the problem with the Gateway journal servers has been identified and engineering is now rolling out a fix. This problem is limited to journaling only, and does not affect inbound or outbound mail delivery. We will follow up as soon as we have further information. Affected components Gateway (Partial outage)

Status: Monitoring A fix has now been applied in both EU and US regions. Journaling services are recovering. A very small number of tenants in the EU and US are still experiencing issues and we continue to work on finding the cause for those tenants. Journal emails are flowing again for the majority customers, but please bear in mind that some queuing for journaling may persist for affected tenants for a while. This problem is limited to journaling only, and does not affect inbound or outbound mail delivery. Affected components Gateway (Degraded performance)

Status: Resolved As of 00:35 UTC - the small number of remaining Journal servers have returned to operational. Proofpoint will continue to monitor, but please feel free to open a case if you have any additional questions. Affected components Gateway (Operational)

Status: Investigating We’ve been made aware of a potential issue impacting mail delivery through the Gateway. Our teams are currently investigating, and we will follow up as soon as we have more information. Emails sent to the Tessian Inbound or Outbound gateway may not be accepted and route correctly. We would encourage customers to check their Tenant's status by logging into their platform and going to Integrations > Email Deployments > Gateway > Alerting. (your platform URL)/0/admin/integrations/email_deployments/gateway_alerting If you are impacted, we would encourage you to disable routing to the Tessian Gateway to temporarily reduce the impact to your organization. O365/Exchange: 1. Go to: Exchange Admin Center (in O365: Admin → Admin Centers → Exchange) 2. Select "mail flow" in the left vertical menu 3. Select "rules" in the top horizontal menu 4. Locate your Tessian inbound/outbound rule, e.g. “Tessian Inbound”, "Tessian Outbound” 5. Un-check the tick-box to disable the rule > To resume routing to the Gateway, check the tick-box to re-enable the rule. G Suite: 1. Go to: G Suite → Gmail → Advanced Settings 2. In the Compliance section, disable the following rule: > “Tessian Inbound” Affected components Gateway (Partial outage)

Status: Monitoring The team has confirmed a subset of customers were impacted on the EU. They took manual steps to resolve for impacted customers, and as of 13:30 UTC email should be flowing again for all customers. The team is continuing its investigation as it monitors our systems closely. We will provide more updates as they become available. Affected components Gateway (Operational)

Status: Monitoring We have seen no additional failures since 13:05 UTC, and services remain healthy. Out of an abundance of caution, we will continue to monitor through the weekend. Affected components Gateway (Operational)

Status: Resolved All systems remain operational with no regressions. The team continues its work on post incident cause, evaluations, and steps to prevent in the future. Please feel free open a support case if you would like additional information. Affected components Gateway (Operational)