{"id":14952,"date":"2026-02-13T05:01:30","date_gmt":"2026-02-12T20:01:30","guid":{"rendered":"https:\/\/m365jp.net\/?p=14952"},"modified":"2026-02-13T05:01:50","modified_gmt":"2026-02-12T20:01:50","slug":"servicerestored-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-13-servicerestored-ex1227432-exchange-online-some-users-legitimate-email-messages-may-be-marked-as-phishing-and-quarantined-in-exchange-online","title":{"rendered":"[serviceRestored] 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>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers’ legitimate email messages may have been marked as phishing and quarantined in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/12\/2026 19:15:41<\/td>\n<\/tr>\n
Start Time<\/th>\n02\/05\/2026 00:26:00<\/td>\n<\/tr>\n
End Time<\/th>\n02\/12\/2026 14:00:00<\/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 have been marked as phishing and quarantined in Exchange Online.<\/p>\n

More info: Users can expect messages which were previously quarantined by this incident to have been successfully delivered.<\/p>\n

Final status: We\u2019ve validated the successful release of the small portion of remaining messages and confirmed the impact associated with this incident is now resolved.<\/p>\n

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

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

End time: Thursday, February 12, 2026, at 2:00 PM UTC<\/p>\n

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

Next steps: We’re reviewing our ongoing URL rule implementation processes to find ways to reduce similar false positive detections in the future while continuing to adapt and respond to evolving spam and phishing techniques. <\/p>\n

We’ll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.<\/td>\n<\/tr>\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-14952","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14952","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=14952"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14952\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}