{"id":14878,"date":"2026-02-08T09:00:48","date_gmt":"2026-02-08T00:00:48","guid":{"rendered":"https:\/\/m365jp.net\/?p=14878"},"modified":"2026-02-08T09:02:15","modified_gmt":"2026-02-08T00:02:15","slug":"servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-08-servicedegradation-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online-2","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\/07\/2026 23:01:42<\/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

Current status: We\u2019re reviewing the release of quarantined messages for affected users and working on confirming legitimate URLs are unblocked. Some users may see their previously quarantined messages successfully delivered and we\u2019re working to confirm full remediation. We\u2019ll provide an estimated time to resolve when one becomes available.<\/p>\n

Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted.<\/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: Tuesday, February 10, 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

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\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\u3002<\/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-14878","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14878","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=14878"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14878\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}