{"id":13883,"date":"2025-11-20T04:00:54","date_gmt":"2025-11-19T19:00:54","guid":{"rendered":"https:\/\/m365jp.net\/?p=13883"},"modified":"2025-11-20T04:01:17","modified_gmt":"2025-11-19T19:01:17","slug":"servicedegradation-ex1185322-exchange-online-some-users-may-be-unable-to-send-or-receive-email-messages-through-the-ios-mail-app-using-exchange-activesync-eas","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2025-11-20-servicedegradation-ex1185322-exchange-online-some-users-may-be-unable-to-send-or-receive-email-messages-through-the-ios-mail-app-using-exchange-activesync-eas","title":{"rendered":"[serviceDegradation] EX1185322 | Exchange Online | Some users may be unable to send or receive email messages through the iOS Mail app using Exchange ActiveSync (EAS)"},"content":{"rendered":"
\n
\n
\n\n\n\n
EX1185322 | Exchange Online | Some users may be unable to send or receive email messages through the iOS Mail app using Exchange ActiveSync (EAS)<\/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>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to send or receive Exchange Online email messages through the native iOS Mail app using EAS.<\/td>\n<\/tr>\n
Last Updated<\/th>\n11\/19\/2025 18:55:12<\/td>\n<\/tr>\n
Start Time<\/th>\n11\/12\/2025 18:50:40<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to send or receive email messages through the iOS Mail app using Exchange ActiveSync (EAS)<\/p>\n

User impact: Users may be unable to send or receive Exchange Online email messages through the native iOS Mail app using EAS.<\/p>\n

More info: The impacted users can authenticate without issue, but they receive the error “Cannot Get Mail. The connection to the server failed.” when trying to refresh email messages in the Mail app.<\/p>\n

Current status: We\u2019ve identified a potential source of impact where a recent HTTP3 configuration change for the QUIC feature in the Exchange Online client access path may be resulting in intermittent mail delivery failures for a limited number of native iOS Mail clients. We\u2019ve disabled this change in the affected environments and are currently requesting impacted users test while we await confirmation that this action has successfully resolved the issue, which would validate our findings.<\/p>\n

Scope of impact: Impact may occur for some users, where they can\u2019t send or receive Exchange Online email messages through the native iOS Mail app using EAS.<\/p>\n

Next update by: Thursday, November 20, 2025, at 12:00 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u3001Exchange ActiveSync(EAS)\u3092\u4f7f\u7528\u3057\u3066iOS\u30e1\u30fc\u30eb\u30a2\u30d7\u30ea\u3092\u901a\u3058\u3066\u30e1\u30fc\u30eb\u306e\u9001\u53d7\u4fe1\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306f\u3001EAS\u3092\u4f7f\u3063\u3066\u30cd\u30a4\u30c6\u30a3\u30d6\u306eiOS\u30e1\u30fc\u30eb\u30a2\u30d7\u30ea\u3092\u901a\u3058\u3066Exchange Online\u306e\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u9001\u53d7\u4fe1\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e6\u30fc\u30b6\u30fc\u306f\u554f\u984c\u306a\u304f\u8a8d\u8a3c\u3067\u304d\u307e\u3059\u304c\u3001\u300c\u30e1\u30fc\u30eb\u3092\u53d7\u3051\u53d6\u308c\u307e\u305b\u3093\u3002\u30e1\u30fc\u30eb\u30a2\u30d7\u30ea\u3067\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u66f4\u65b0\u3057\u3088\u3046\u3068\u3057\u305f\u969b\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u63a5\u7d9a\u304c\u5931\u6557\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u73fe\u72b6:Exchange Online\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30af\u30bb\u30b9\u30d1\u30b9\u306eQUIC\u6a5f\u80fd\u306e\u6700\u8fd1\u306eHTTP3\u8a2d\u5b9a\u5909\u66f4\u306b\u3088\u308a\u3001\u9650\u3089\u308c\u305f\u4e00\u90e8\u306e\u30cd\u30a4\u30c6\u30a3\u30d6iOS\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u65ad\u7d9a\u7684\u306a\u30e1\u30fc\u30eb\u914d\u4fe1\u5931\u6557\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5f71\u97ff\u6e90\u3092\u7279\u5b9a\u3057\u307e\u3057\u305f\u3002\u5f71\u97ff\u3092\u53d7\u3051\u305f\u74b0\u5883\u3067\u306f\u3053\u306e\u5909\u66f4\u3092\u7121\u52b9\u306b\u3057\u3066\u304a\u308a\u3001\u73fe\u5728\u3001\u3053\u306e\u5bfe\u5fdc\u304c\u554f\u984c\u306e\u6b63\u5e38\u306b\u89e3\u6c7a\u3057\u305f\u304b\u3069\u3046\u304b\u306e\u78ba\u8a8d\u3092\u5f85\u3064\u9593\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u30c6\u30b9\u30c8\u3092\u8981\u8acb\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u79c1\u305f\u3061\u306e\u8abf\u67fb\u7d50\u679c\u304c\u88cf\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u3001iOS\u306e\u30cd\u30a4\u30c6\u30a3\u30d6\u30e1\u30fc\u30eb\u30a2\u30d7\u30ea\u3067EAS\u3092\u4f7f\u3063\u3066Exchange Online\u306e\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u53d7\u4fe1\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u6b21\u56de\u66f4\u65b0:2025\u5e7411\u670820\u65e5\u6728\u66dc\u65e5 0:00 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1185322 | Exchange Online | Some users may be unable to send or receive email messages through the iOS Mail […]<\/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-13883","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/13883","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=13883"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/13883\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=13883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=13883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=13883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}