Outage in Tessian EU
Delays evaluating inbound emails on our EU Server
Resolved Minor
January 21, 2026 - Started 3 months ago
- Lasted about 23 hours
Incident Report
Proofpoint is investigating delays evaluating inbound emails by Core Email Protection API
Impact:
Security Events may take over 3 minutes to be created for newly delivered emails.
Associated Warn/Quarantine actions based off your configuration may also be delayed by the same amount.
There is no delay to initial email delivery.
Proofpoint is actively investigating the cause and working to identify a resolution. We will update as it progresses.
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Latest Updates ( sorted recent to last )
INVESTIGATING
3 months ago - at 01/21/2026 04:33PM
Proofpoint is investigating delays evaluating inbound emails by Core Email Protection API
Impact:
Security Events may take over 3 minutes to be created for newly delivered emails.
Associated Warn/Quarantine actions based off your configuration may also be delayed by the same amount.
There is no delay to initial email delivery.
Proofpoint is actively investigating the cause and working to identify a resolution. We will update as it progresses.
Latest Tessian EU outages
Internal Emails Missing from Investigate & Respond - 18 days ago
Some Core Email Protection (CEPAPI) Security Events unavailable. - about 2 months ago
Intermittent Inbound & Outbound Email Check Delays for EU - 3 months ago
Microsoft service degradation impacting mailflow - 3 months ago
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