Tessian experienced a minor incident on February 26, 2026 affecting Core Email Protection API, lasting —. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- 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)
- 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)
- 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)