{"id":14869,"date":"2026-02-07T13:00:57","date_gmt":"2026-02-07T04:00:57","guid":{"rendered":"https:\/\/m365jp.net\/?p=14869"},"modified":"2026-02-07T13:02:15","modified_gmt":"2026-02-07T04:02:15","slug":"servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-email-and-quarantined-in-exchange-online-3","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-3","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 03:50:26<\/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: We’re continuing to review our logging and detection components to ensure our current mitigation strategy fully remediates the impact. In the meantime, we’re releasing quarantined messages for affected users and unblocking URLs as our investigation progresses.<\/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 8:30 PM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306e\u6b63\u5f53\u306a\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30e1\u30fc\u30eb\u3068\u3057\u3066\u30de\u30fc\u30af\u3055\u308c\u3001Exchange Online\u3067\u9694\u96e2\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059<\/p>\n

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