{"id":14868,"date":"2026-02-07T12:01:17","date_gmt":"2026-02-07T03:01:17","guid":{"rendered":"https:\/\/m365jp.net\/?p=14868"},"modified":"2026-02-07T12:01:22","modified_gmt":"2026-02-07T03:01:22","slug":"servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-email-and-quarantined-in-exchange-online-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-07-servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-email-and-quarantined-in-exchange-online-2","title":{"rendered":"[serviceDegradation] EX1227432 | Exchange Online | Some users’ legitimate email messages may be marked as phishing email and quarantined in Exchange Online"},"content":{"rendered":"
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EX1227432 | Exchange Online | Some users’ legitimate email messages may be marked as phishing email and quarantined in Exchange Online<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers’ legitimate email messages may be marked as phishing email and quarantined in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/07\/2026 02:22:02<\/td>\n<\/tr>\n
Start Time<\/th>\n02\/05\/2026 15:31:57<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users’ legitimate email messages may be marked as phishing email and quarantined in Exchange Online<\/p>\n

User impact: Users’ legitimate email messages may be marked as phishing email and quarantined in Exchange Online.<\/p>\n

Current status: While monitoring the process of releasing the quarantined messages for the affected users, we received fresh reports of quarantined messages from a subset of affected users. We’re reviewing the logging and impact details provided by this subset of users to help us determine how we can adjust our current mitigation strategy to ensure full remediation for all affected environments.<\/p>\n

Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted.<\/p>\n

Root cause: The email messages are getting incorrectly marked as phishing and quarantined in Exchange Online due to ever-evolving criteria aimed at identifying suspicious email messages, as spam and phishing techniques have become more sophisticated in avoiding detection.<\/p>\n

Next update by: Saturday, February 7, 2026, at 4:30 AM UTC<\/td>\n<\/tr>\n

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