Tessian EU Outage History

Tessian EU experienced degradation in multiple features including the Silent outbound API and Abuse Mailbox due to a third-party vendor issue on Proofpoint's side. The incident affected Core Email Protection API and Adaptive Email DLP services for 20.7 hours. Proofpoint Engineering manually mitigated customer symptoms throughout the incident, and the underlying vendor issue was resolved with a deployed fix at 21:30 UTC on June 3rd, 2026.

Tessian EU experienced a 16.5-hour issue with Gateway journal servers that prevented email journaling functionality while leaving inbound and outbound mail delivery unaffected. The problem impacted tenants in both EU and US regions, causing journaling queues to build up. A fix was identified and deployed, restoring journaling services for the majority of customers, though some tenants continued experiencing issues and queuing delays during recovery.

A gateway issue in Tessian EU prevented emails from being properly accepted and routed through the inbound and outbound gateways, affecting a subset of customers for approximately 97 hours. The engineering team manually resolved the issue for impacted customers, with email flow restored by 13:30 UTC on May 22nd, 2026.

Tessian EU experienced delays in displaying Adaptive Email DLP Events in both the portal and external API following a scheduled maintenance window. While security checks continued to be processed and recorded normally in the background, users faced delays in viewing these events through the interface. The issue was identified and resolved with a fix applied after 2.1 hours, with systems showing signs of recovery.

Tessian EU experienced a gateway outage from 07:30 to 08:36 UTC caused by a capacity limitation during a routine security patch application, affecting some customers' inbound and outbound email server availability. The issue has been fully resolved with servers now showing as available, and queued emails are being delivered automatically with minimal delays and no data loss.

Tessian EU experienced a Gateway outage from 07:30 to 08:56 UTC on May 13th, 2026, caused by a capacity limitation during a routine security patch application. The outage affected inbound and outbound email servers, showing them as 'Unavailable' to customers. The issue was fully resolved with server statuses restored to 'Available' and queued emails automatically delivered without data loss.

The Tessian EU Gateway experienced a major outage lasting 28.4 hours where emails sent to inbound or outbound gateways were not being accepted or routed correctly, starting around 14:00 UTC on April 27th, 2026. Customers were advised to temporarily disable their email routing rules to Tessian Gateway to reduce impact on their organizations. The issue was identified and remediated through a gradual recovery process, with all impacted customer gateways restored by 20:45 UTC, allowing queued mail to be processed and delivered normally.

The Tessian EU service experienced gateway connection issues where Proofpoint Inbound and Outbound gateways were rejecting connections from Google Workspace (Gsuite), causing email delays for affected customers over a 24.6-hour period. Customers using Google Workspace as their email environment reported increased connection problems and mail flow disruptions. The issue was resolved when Google applied mitigation to a parallel Gmail incident they were experiencing, with mail flow resuming after 20:00 UTC, and customers were advised they could re-enable their previously disabled routing rules.

On April 8th 2026 between 14:31 and 14:48 UTC, Tessian EU experienced an issue where internal emails became invisible in the Investigate & Respond tab, though email security scanning, detection alerts, and remediation actions continued to function normally. External emails and internal emails outside this 17-minute window remained visible and unaffected. The team resolved the visibility issue but determined that the missing internal emails from this timeframe cannot be restored.

Tessian EU's Core Email Protection (CEPAPI) Security Events view experienced an issue where threat event details processed between February 27th and March 2nd could not be viewed in full, displaying an "event details are currently unavailable" error message. The incident lasted 69.8 hours and affected users' ability to view complete security event information in the Security Events tab, though impacted events remained accessible through the Investigate & Respond tab. Engineering successfully restored the majority of Security Events through a backfill process, with final events being processed at the time of resolution.