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Status: Monitoring Starting October 7th 2026 at ~07:20 UTC Proofpoint began to receive Graph API failures when attempting to create a user's Quarantine folder for Core Email Protection API. Impact: For less than 600 individual mailboxes in total across all customers and environments, this resulted in some emails failing to quarantine. As of October 9th 2026 17:30 UTC all impacted messages have now been quarantined. Remediation: As of October 9th 2026 16:48 UTC - To prevent broader impact, Proofpoint has pushed a change where all quarantined messages are moved to a hidden folder within the user's inbox. This is how quarantine for Core Email Protection API functioned up until July 2026. Although the user can't access this folder, if they go searching for a mail item it may show in the search results. Proofpoint has escalated the issue to Microsoft to understand the initial cause. As impact is now remediated, we will only look to update the quarantine logic back once we are confident we will be able to create the required folder as expected and without error. We will hold this page open in a monitoring state until we have a better understanding of the long term timeline. Feel free to open a support case with any questions or concerns.

Status: Resolved As of October 16th 2026 13:30 UTC, Proofpoint restored Quarantine logic for Core Email Protection API to its previous state. After working closely with Microsoft, we were able to restore this functionality and create Quarantine folders without failures. After monitoring for the past few hours without issue, we will now move this to resolved.

Status: Identified We've discovered an issue with the Gateway sending Block notifications to end users. Since August 25 2026 - Any policy set to Block (not Warn), correctly blocked the sending of the email and created a security event. However, if the email was checked by the Gateway, the end user did not receive a notification that their email violated a policy and was blocked. As of September 23 2026 - Our team is correcting the issue across all customers. Block notifications will start sending to end users going forward, and backlogged block notifications from the last month are will go start to go out. For customers using the Gateway who have policies set to block, they may get reports from these end users due to the delay in the notifications. Please feel free to reach out to Support with any questions. Affected components Gateway (Degraded performance)

Status: Identified We have begun rolling out a change to restore Gateway block notifications for affected customers. Based on customer feedback, we have limited notification backfills to emails that were blocked within the last 48 hours. As the rollout progresses, some end users may receive delayed block notifications for messages that were blocked during that timeframe. If you have any questions, please contact Support. Affected components Gateway (Degraded performance)

Status: Resolved We've completed a restore of Gateway block notifications for affected customers. Block notifications are now sending to end users going forward, and backlogged notifications for the last 48 hours have sent. We appreciate your patience, and please feel free to contact support with any additional questions. Affected components Gateway (Operational)

Status: Investigating Proofpoint is recovering from an issue impacting multiple services: https://proofpoint.my.site.com/community/s/article/Proofpoint-Service-Interruption-Affecting-Cloud-Service-Portal-Access-04-SEP-2026 As a knock on effect, we have seen a slight delay in a small number of post delivery checks. The system is currently recovering and we will update once all systems are operational. Affected components Core Email Protection API (Degraded performance)

Status: Resolved As the team continues to review and monitor, they no longer see any delays on the EU Sever. Affected components Core Email Protection API (Operational)

Status: Identified We've identified an issue impacting the following service and scenario: • For Adaptive Email DLP Custom Policies • Set to Silently Track • Configured to send Compliance Alerts • And scanned by the Gateway Since September 1, 2026, at 12:30 PM UTC - Compliance Alerts were not sent for policies set to Silently Track and configured to send them, when the check was done by the Gateway. Polices set to Warn, or checks done by other integrations, have no impact and Compliance Alerts function as expected. Our team is actively correcting the issue and all Alerts will be send momentarily. If you were impacted, you will notice the backlog of alerts come in all at once. We will update once complete. Affected components AEDLP Custom Policies (Degraded performance)

Status: Resolved A fix has been applied to all customer Gateways. Compliance Alerts are now sending as expected on Custom Policies set to Silent Track which are checked by the Gateway. All backlogged Compliance Alerts impacted by this issue have now sent. If you have any additional questions, please feel free to raise a support case. Affected components AEDLP Custom Policies (Operational)

Status: Resolved We experienced an issue resulting in inbound check delays and outbound check timeouts. Impact window: Aug 5 2026: 14:00 to 17:00 UTC Impact: • Core Email Protection API: • During the window, inbound message checks may have been delayed, resulting in corresponding delays in a message being actioned and available in the portal. • Adaptive Email DLP: • During the window, outbound messages checks by the Office Add-in may have been delayed, resulting in slightly elevated timeouts. • Up to 5% of checks may have timed out and failed open via the Add-in. Our team worked quickly to take steps to address the issue and it is since resolved. Please feel free to open a support case with any additional questions. Affected components M365 Add-in (Operational) Gateway (Operational) Core Email Protection API (Operational) Investigate and Respond - Email Search (Operational) Reported Emails (Operational) Proofpoint Cloud Email Security Platform (Operational) AEDLP Email Exfiltration Protection (Operational) AEDLP Email Misdelivery Protection (Operational) COM Add-in for Windows (Operational) Proofpoint API (Operational) Proofpoint Portal (Operational) AEDLP Custom Policies (Operational) Core Email Protection API (Operational)