{"id":14751,"date":"2026-01-31T05:00:55","date_gmt":"2026-01-30T20:00:55","guid":{"rendered":"https:\/\/m365jp.net\/?p=14751"},"modified":"2026-01-31T05:02:26","modified_gmt":"2026-01-30T20:02:26","slug":"servicerestored-ex1224375-exchange-online-users-routing-their-exchange-online-email-through-a-third-party-protection-service-may-have-send-and-receive-delays","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-01-31-servicerestored-ex1224375-exchange-online-users-routing-their-exchange-online-email-through-a-third-party-protection-service-may-have-send-and-receive-delays","title":{"rendered":"[serviceRestored] EX1224375 | Exchange Online | Users routing their Exchange Online email through a third-party protection service may have send and receive delays"},"content":{"rendered":"
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EX1224375 | Exchange Online | Users routing their Exchange Online email through a third-party protection service may have send and receive delays<\/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’ Exchange Online email routed through a third-party protection service may have been delayed.<\/td>\n<\/tr>\n
Last Updated<\/th>\n01\/30\/2026 19:43:40<\/td>\n<\/tr>\n
Start Time<\/th>\n01\/26\/2026 06:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n01\/30\/2026 18:25:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users routing their Exchange Online email through a third-party protection service may have send and receive delays<\/p>\n

User impact: Users’ Exchange Online email routed through a third-party protection service may have been delayed.<\/p>\n

More info: This issue specifically impacted users who use Simple Mail Transfer Protocol (SMTP) as their Exchange Online connection method and routed their email messages through a specific third-party email protection service. The email delays, which impacted both sending and receiving email, occurred in all Exchange Online connection methods.<\/p>\n

Final status: We’ve fully implemented our identified configuration change and confirmed using internal telemetry that it effectively mitigated this issue. We determined that a cache limit configuration that helps facilitate the impact scenario process with SMTP mail flow was misconfigured, resulting in impact.<\/p>\n

Scope of impact: This problem may have impacted any user sending or receiving email messages when leveraging a specific third-party email protection service.<\/p>\n

Start time: Monday, January 26, 2026, at 6:00 AM UTC<\/p>\n

End time: Friday, January 30, 2026, at 6:25 PM UTC<\/p>\n

Root cause: A cache limit configuration that helps facilitate the impact scenario process with SMTP mail flow was misconfigured, resulting in impact.<\/p>\n

Next steps:
– We’re continuing our research into identifying the root cause of this impacting event to better understand how to prevent it from happening again in the future.<\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:Exchange Online\u306e\u30e1\u30fc\u30eb\u3092\u7b2c\u4e09\u8005\u306e\u4fdd\u8b77\u30b5\u30fc\u30d3\u30b9\u3092\u901a\u3058\u3066\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u3088\u308b\u9001\u53d7\u4fe1\u9045\u5ef6\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u7b2c\u4e09\u8005\u306e\u4fdd\u8b77\u30b5\u30fc\u30d3\u30b9\u3092\u7d4c\u7531\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u306eExchange Online\u30e1\u30fc\u30eb\u304c\u9045\u5ef6\u3057\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u3053\u306e\u554f\u984c\u306f\u3001Simple Mail Transfer Protocol(SMTP)\u3092Exchange Online\u306e\u63a5\u7d9a\u65b9\u6cd5\u3068\u3057\u3066\u4f7f\u7528\u3057\u3001\u30e1\u30fc\u30eb\u3092\u7279\u5b9a\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30e1\u30fc\u30eb\u4fdd\u8b77\u30b5\u30fc\u30d3\u30b9\u7d4c\u7531\u3067\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u306b\u7279\u306b\u5f71\u97ff\u3057\u307e\u3057\u305f\u3002\u30e1\u30fc\u30eb\u306e\u9045\u5ef6\u306f\u3001\u3059\u3079\u3066\u306eExchange Online\u63a5\u7d9a\u65b9\u5f0f\u3067\u767a\u751f\u3057\u305f\u3002<\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u7279\u5b9a\u3055\u308c\u305f\u8a2d\u5b9a\u5909\u66f4\u3092\u5b8c\u5168\u306b\u5b9f\u88c5\u3057\u3001\u5185\u90e8\u30c6\u30ec\u30e1\u30c8\u30ea\u3067\u3053\u306e\u554f\u984c\u304c\u52b9\u679c\u7684\u306b\u7de9\u548c\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002SMTP\u30e1\u30fc\u30eb\u30d5\u30ed\u30fc\u306e\u30a4\u30f3\u30d1\u30af\u30c8\u30b7\u30ca\u30ea\u30aa\u51e6\u7406\u3092\u4fc3\u9032\u3059\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u30ea\u30df\u30c3\u30c8\u306e\u8a2d\u5b9a\u304c\u8aa4\u3063\u3066\u8a2d\u5b9a\u3055\u308c\u3001\u5f71\u97ff\u304c\u751f\u3058\u305f\u3053\u3068\u304c\u5224\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u3053\u306e\u554f\u984c\u306f\u3001\u7279\u5b9a\u306e\u7b2c\u4e09\u8005\u30e1\u30fc\u30eb\u4fdd\u8b77\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u305f\u969b\u306b\u3001\u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3057\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e741\u670826\u65e5(\u6708)\u5348\u524d6\u6642(UTC)<\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e741\u670830\u65e5\u91d1\u66dc\u65e5 \u5348\u5f8c6\u664225\u5206 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:SMTP\u30e1\u30fc\u30eb\u30d5\u30ed\u30fc\u306e\u30a4\u30f3\u30d1\u30af\u30c8\u30b7\u30ca\u30ea\u30aa\u51e6\u7406\u3092\u4fc3\u9032\u3059\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u5236\u9650\u306e\u8a2d\u5b9a\u304c\u8aa4\u3063\u3066\u8a2d\u5b9a\u3055\u308c\u3001\u5f71\u97ff\u304c\u751f\u3058\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u4eca\u5f8c\u3082\u540c\u69d8\u306e\u4e8b\u8c61\u304c\u518d\u767a\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u3053\u306e\u5f71\u97ff\u306e\u6839\u672c\u539f\u56e0\u3092\u7279\u5b9a\u3059\u308b\u7814\u7a76\u3092\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u304c\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1224375 | Exchange Online | Users routing their Exchange Online email through a third-party protection servi […]<\/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-14751","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14751","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=14751"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14751\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}