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Abnormal Security incident

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Abnormal Security

Emails Incorrectly Remediated – Inbound Email Security and AI Security Mailbox

Summary

Starting at 22:00 UTC on May 18, 2026, Abnormal identified an increase in legitimate emails being incorrectly flagged as malicious and remediated, impacting Inbound Email Security and AI Security Mailbox. The engineering team identified and disabled the rule responsible for falsely flagging these emails at 01:03 UTC on May 19, 2026. Messages affected during the impact window will be reprocessed.
Ongoing5/18/2026, 7:24 PM EDT<1mminor
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