{"id":14896,"date":"2026-02-10T09:01:04","date_gmt":"2026-02-10T00:01:04","guid":{"rendered":"https:\/\/m365jp.net\/?p=14896"},"modified":"2026-02-10T09:02:43","modified_gmt":"2026-02-10T00:02:43","slug":"servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-3","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-10-servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-3","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\/09\/2026 23:34:22<\/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 discovered an issue when unblocking some legitimate URLs which we must resolve prior to releasing the quarantined messages. We\u2019re working on addressing the blocker so we can proceed with unblocking the legitimate URLs and releasing the quarantined messages to remediate.<\/p>\n

Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted.<\/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: Wednesday, February 11, 2026, at 1:00 AM 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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EX1227432 | Exchange Online | Some users’ legitimate email messages may be marked as phishing and quaran […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-14896","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=14896"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14896\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}