Tessian Outage History

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Tessian had 27 outages in the last 2 years totaling 489h 21m of downtime — averaging 1.1 incidents per month.

There were 27 Tessian outages since October 9, 2025 totaling 489h 21m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://us.status.tessian.com

Minor September 23, 2026

Gateway: Delay in AEDLP "Block" configured policies end user notifications

Detected by Pingoru
Sep 23, 2026, 04:33 PM UTC
Resolved
Sep 24, 2026, 04:59 PM UTC
Duration
1d
Affected: Gateway
Timeline · 3 updates
  1. identified Sep 23, 2026, 04:33 PM UTC

    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)

  2. identified Sep 24, 2026, 11:13 AM UTC

    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)

  3. resolved Sep 24, 2026, 04:59 PM UTC

    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)

Read the full incident report →

Minor September 4, 2026

Delay in small number of inbound post delivery checks

Detected by Pingoru
Sep 04, 2026, 05:28 PM UTC
Resolved
Sep 04, 2026, 06:24 PM UTC
Duration
56m
Affected: Core Email Protection APICore Email Protection API
Timeline · 2 updates
  1. monitoring Sep 04, 2026, 05:28 PM UTC

    Status: Monitoring 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)

  2. resolved Sep 04, 2026, 06:24 PM UTC

    Status: Resolved As of 18:20 UTC, there is no longer any impact to the US servers and all systems are operational. Affected components Core Email Protection API (Operational)

Read the full incident report →

Minor September 3, 2026

Delay in Compliance Alerts for AEDLP Policies set to Silently Track via Gateway

Detected by Pingoru
Sep 03, 2026, 02:31 PM UTC
Resolved
Sep 04, 2026, 01:26 PM UTC
Duration
22h 55m
Affected: AEDLP Custom Policies
Timeline · 2 updates
  1. identified Sep 03, 2026, 02:31 PM UTC

    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)

  2. resolved Sep 04, 2026, 01:26 PM UTC

    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)

Read the full incident report →

Minor August 21, 2026

Check lag on US-based portals at the moment

Detected by Pingoru
Aug 21, 2026, 03:38 PM UTC
Resolved
Aug 21, 2026, 07:28 PM UTC
Duration
3h 49m
Affected: GatewayCore Email Protection APIM365 Add-inCOM Add-in for WindowsCore Email Protection API
Timeline · 3 updates
  1. identified Aug 21, 2026, 03:38 PM UTC

    Status: Identified We are experiencing a check lag on US-based portals at the moment. This issue began at 14:14 UTC Friday 21st August. Engineering is investigating the issue and working on a solution. You may experience timeouts checking messages during this time. We will update this status page with further details and progress. Affected components Gateway (Degraded performance) M365 Add-in (Degraded performance) COM Add-in for Windows (Degraded performance) Core Email Protection API (Degraded performance)

  2. identified Aug 21, 2026, 03:39 PM UTC

    Status: Identified We are experiencing a check lag on US-based portals at the moment. This issue began at 14:14 UTC Friday 21st August. Engineering is investigating the issue and working on a solution. You may experience timeouts checking inbound messages during this time. Affected components M365 Add-in (Degraded performance) COM Add-in for Windows (Degraded performance) Core Email Protection API (Degraded performance) Gateway (Degraded performance)

  3. resolved Aug 21, 2026, 07:28 PM UTC

    Status: Resolved Between 14:14 UTC and 18:05 UTC, we experienced a delay in Defender checks affecting inbound email processing. Our Engineering team investigated the issue, and following continued monitoring, checks are now performing as expected. If you have any additional questions, please don't hesitate to open a support case. Affected components Gateway (Operational) M365 Add-in (Operational) COM Add-in for Windows (Operational) Core Email Protection API (Operational)

Read the full incident report →

Minor August 5, 2026

Inbound Check Delays

Detected by Pingoru
Aug 05, 2026, 02:00 PM UTC
Resolved
Aug 05, 2026, 02:00 PM UTC
Duration
—
Affected: Proofpoint APIGatewayCore Email Protection APIProofpoint Cloud Email Security PlatformProofpoint PortalM365 Add-inCOM Add-in for WindowsCore Email Protection APIAEDLP Email Misdelivery ProtectionAEDLP Email Exfiltration ProtectionAEDLP Custom PoliciesReported EmailsInvestigate and Respond - Email Search
Timeline · 1 update
  1. resolved Aug 05, 2026, 02:00 PM UTC

    Status: Resolved We experienced an issue resulting in inbound check delays. Impact window: Aug 5 2026: 14:00 to 14:30 UTC Impact: During the window, inbound message checks may have been delayed, resulting in corresponding delays in a message being actioned and available in the portal. • Maximum observed delay: ~15 minutes Our team quickly took steps to address the issue and it is since resolved. Please feel free to open a support case with any additional questions. Affected components Proofpoint API (Operational) Core Email Protection API (Operational) AEDLP Email Exfiltration Protection (Operational) Core Email Protection API (Operational) Reported Emails (Operational) Gateway (Operational) Proofpoint Cloud Email Security Platform (Operational) AEDLP Email Misdelivery Protection (Operational) M365 Add-in (Operational) COM Add-in for Windows (Operational) Proofpoint Portal (Operational) Investigate and Respond - Email Search (Operational) AEDLP Custom Policies (Operational)

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Minor July 28, 2026

Degraded Live Syncing Performance

Detected by Pingoru
Jul 28, 2026, 02:24 PM UTC
Resolved
Jul 31, 2026, 01:58 PM UTC
Duration
2d 23h
Affected: Core Email Protection APIM365 Add-inCore Email Protection APIAEDLP Email Misdelivery ProtectionAEDLP Email Exfiltration Protection
Timeline · 3 updates
  1. identified Jul 28, 2026, 02:24 PM UTC

    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)

  2. monitoring Jul 28, 2026, 06:51 PM UTC

    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)

  3. resolved Jul 31, 2026, 01:58 PM UTC

    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)

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Minor July 6, 2026

Errors accessing frontend Portals on US Server

Detected by Pingoru
Jul 06, 2026, 04:03 PM UTC
Resolved
Jul 06, 2026, 05:50 PM UTC
Duration
1h 47m
Affected: Proofpoint Portal
Timeline · 3 updates
  1. investigating Jul 06, 2026, 04:03 PM UTC

    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)

  2. identified Jul 06, 2026, 04:23 PM UTC

    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)

  3. resolved Jul 06, 2026, 05:50 PM UTC

    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)

Read the full incident report →

Minor June 24, 2026

CEPAPI Performance Degradation

Detected by Pingoru
Jun 24, 2026, 09:47 PM UTC
Resolved
Jun 24, 2026, 10:41 PM UTC
Duration
54m
Affected: Core Email Protection API
Timeline · 2 updates
  1. monitoring Jun 24, 2026, 09:47 PM UTC

    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)

  2. resolved Jun 24, 2026, 10:41 PM UTC

    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)

Read the full incident report →

Minor May 27, 2026

Issue with the Gateway journal servers.

Detected by Pingoru
May 27, 2026, 08:13 AM UTC
Resolved
May 28, 2026, 12:40 AM UTC
Duration
16h 26m
Affected: Gateway
Timeline · 4 updates
  1. investigating May 27, 2026, 08:13 AM UTC

    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)

  2. identified May 27, 2026, 10:55 AM UTC

    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)

  3. monitoring May 27, 2026, 12:52 PM UTC

    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)

  4. resolved May 28, 2026, 12:40 AM UTC

    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)

Read the full incident report →

Minor May 13, 2026

Reduced Outbound Checks

Detected by Pingoru
May 13, 2026, 02:20 PM UTC
Resolved
May 13, 2026, 02:20 PM UTC
Duration
—
Affected: Proofpoint APIGatewayProofpoint Cloud Email Security PlatformProofpoint PortalM365 Add-inCOM Add-in for WindowsCore Email Protection APIAEDLP Email Misdelivery ProtectionAEDLP Email Exfiltration ProtectionAEDLP Custom PoliciesReported EmailsInvestigate and Respond - Email Search
Timeline · 1 update
  1. resolved May 13, 2026, 02:20 PM UTC

    Status: Resolved Between 13:55 and 14:20 UTC , we were alerted to an increase in timeouts on our US server for Outbound checks. Outbound emails sent during the impact period may have timed out and sent unchecked. The team quickly took steps to mitigate and will take the appropriate actions to prevent it in the future. Affected components AEDLP Custom Policies (Operational) Proofpoint Cloud Email Security Platform (Operational) Proofpoint API (Operational) AEDLP Email Misdelivery Protection (Operational) AEDLP Email Exfiltration Protection (Operational) Core Email Protection API (Operational) Proofpoint Portal (Operational) Reported Emails (Operational) Investigate and Respond - Email Search (Operational) Gateway (Operational) Core Email Protection API (Operational) M365 Add-in (Operational) COM Add-in for Windows (Operational)

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Major May 13, 2026

Gateway outage between approximately 07:30 UTC and 08:36 UTC

Detected by Pingoru
May 13, 2026, 12:10 PM UTC
Resolved
May 13, 2026, 02:23 PM UTC
Duration
2h 13m
Affected: Gateway
Timeline · 1 update
  1. investigating May 13, 2026, 12:10 PM UTC

    Status: Investigating Between approximately 07:30 UTC and 08:36 UTC, some customers experienced an outage where inbound and outbound server statuses were shown as 'Unavailable'. The issue was caused by a capacity limitation encountered during the application of a routine security patch. This has been fully resolved — server statuses should now show as 'Available'. Any emails queued during the incident are expected to be delivered automatically without intervention. No data loss occurred, and we anticipate minimal delivery delays. We apologise for any disruption caused. Affected components Gateway (Full outage)

Read the full incident report →

Minor May 13, 2026

Gateway outage between 07:30 UTC to 08:56 UTC, 13th May 2026

Detected by Pingoru
May 13, 2026, 10:59 AM UTC
Resolved
May 14, 2026, 04:33 PM UTC
Duration
1d 5h
Affected: Gateway
Timeline · 3 updates
  1. monitoring May 13, 2026, 10:59 AM UTC

    Status: Monitoring Between 07:30 UTC to 08:56 UTC, 13th May 2026 a Gateway outage occurred for customers that manifested as inbound and outbound server status being 'Unavailable'. This has since been resolved and the server statuses should now all be 'Available' once more. Emails in the queue are expected to clear themselves automatically. We are still working through how this happened and will share further details as soon as possible. Please open a support case if you are still experiencing delays. Thank you for your on-going patience. Affected components Gateway (Full outage)

  2. monitoring May 13, 2026, 02:05 PM UTC

    Status: Monitoring Between approximately 07:30 UTC and 08:36 UTC, some customers experienced an outage where inbound and outbound server statuses were shown as 'Unavailable'. The issue was caused by a capacity limitation encountered during the application of a routine security patch. This has been fully resolved — server statuses should now show as 'Available'. Any emails queued during the incident are expected to be delivered automatically without intervention. No data loss occurred, and we anticipate minimal delivery delays. We apologise for any disruption caused, please open a support ticket if you have any questions. We will close this status as resolved after 24 hours monitoring. Affected components Gateway (Operational)

  3. resolved May 14, 2026, 04:33 PM UTC

    Status: Resolved The team has been monitoring closely for the last day, and no new issues have been observed. If you have not done so already, please open a support case if you have any additional questions or concerns - we're happy to help. Affected components Gateway (Operational)

Read the full incident report →

Minor May 13, 2026

Reduced Efficacy of Email Exfiltration for some customers

Detected by Pingoru
May 13, 2026, 04:00 AM UTC
Resolved
May 13, 2026, 04:00 AM UTC
Duration
—
Affected: Proofpoint APIGatewayProofpoint Cloud Email Security PlatformProofpoint PortalM365 Add-inCOM Add-in for WindowsCore Email Protection APIAEDLP Email Misdelivery ProtectionAEDLP Email Exfiltration ProtectionAEDLP Custom PoliciesReported EmailsInvestigate and Respond - Email Search
Timeline · 1 update

Read the full incident report →

Minor March 5, 2026

Some Core Email Protection (CEPAPI) Security Events unavailable.

Detected by Pingoru
Mar 05, 2026, 11:47 AM UTC
Resolved
Mar 05, 2026, 11:47 AM UTC
Duration
16s
Timeline · 2 updates
  1. monitoring Mar 05, 2026, 11:47 AM UTC

    Status: Monitoring All security events have now been successfully restored and validated. Remediation is now completed.

  2. resolved Mar 05, 2026, 11:47 AM UTC

    Status: Resolved All security events have now been successfully restored and validated. Remediation is now completed.

Read the full incident report →

Minor February 24, 2026

Slow Defender Checks

Detected by Pingoru
Feb 24, 2026, 05:19 PM UTC
Resolved
Feb 26, 2026, 12:37 PM UTC
Duration
1d 19h
Affected: Core Email Protection API
Timeline · 3 updates
  1. identified Feb 24, 2026, 05:19 PM UTC

    Status: Identified Around 4pm UTC we began seeing delayed Defender checks for inbound emails. For API users, emails may experience up to a 600 second delay for emails to be checked and quarantined. We are looking into this and will provide updates here. Affected components Core Email Protection API (Degraded performance)

  2. monitoring Feb 24, 2026, 06:20 PM UTC

    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)

  3. resolved Feb 26, 2026, 12:37 PM UTC

    Status: Resolved We are no longer seeing delays in Defender checks. Affected components Core Email Protection API (Operational)

Read the full incident report →