{"id":14941,"date":"2026-02-12T15:01:25","date_gmt":"2026-02-12T06:01:25","guid":{"rendered":"https:\/\/m365jp.net\/?p=14941"},"modified":"2026-02-12T15:06:26","modified_gmt":"2026-02-12T06:06:26","slug":"servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-5","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-12-servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-5","title":{"rendered":"[serviceDegradation] EX1227432 | Exchange Online | Some users’ legitimate email messages may be marked as phishing and quarantined in Exchange Online"},"content":{"rendered":"
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EX1227432 | Exchange Online | Some users’ legitimate email messages may be marked as phishing 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 and quarantined in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/12\/2026 05:17:27<\/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 and quarantined in Exchange Online<\/p>\n

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

More info: Users may see some previously quarantined messages successfully delivered; however, some messages may still be impacted until the issue is fully resolved.<\/p>\n

Current status: We\u2019ve continued to make progress restoring previously affected email messages. We\u2019re actively monitoring the restoration process and taking targeted actions to address any remaining blockers.<\/p>\n

Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted. This information may be updated as our investigation continues.<\/p>\n

Start time: Thursday, February 5, 2026, at 12:26 AM UTC<\/p>\n

Preliminary root cause: An updated URL rule intending to identify more sophisticated spam and phishing email messages is incorrectly quarantining legitimate email messages in Exchange Online, resulting in impact.<\/p>\n

Next update by: Thursday, February 12, 2026, at 6:00 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\u3068\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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\u958b\u59cb\u6642\u9593:2026\u5e742\u67085\u65e5\u6728\u66dc\u65e5 0:26 UTC<\/p>\n

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