{"id":15862,"date":"2026-04-11T00:00:56","date_gmt":"2026-04-10T15:00:56","guid":{"rendered":"https:\/\/m365jp.net\/?p=15862"},"modified":"2026-04-11T00:01:10","modified_gmt":"2026-04-10T15:01:10","slug":"servicedegradation-ex1276049-exchange-online-users-email-messages-are-being-delivered-in-exchange-online-but-senders-may-receive-incorrect-non-delivery-reports-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-11-servicedegradation-ex1276049-exchange-online-users-email-messages-are-being-delivered-in-exchange-online-but-senders-may-receive-incorrect-non-delivery-reports-2","title":{"rendered":"[serviceDegradation] EX1276049 | Exchange Online | Users email messages are being delivered in Exchange Online but senders may receive incorrect non\u2011delivery reports"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">EX1276049 | Exchange Online | Users email messages are being delivered in Exchange Online but senders may receive incorrect non\u2011delivery reports<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Status<\/th>\n<td class=\"bad\">serviceDegradation<\/td>\n<\/tr>\n<tr>\n<th>Classification<\/th>\n<td>advisory<\/td>\n<\/tr>\n<tr>\n<th>User Impact<\/th>\n<td>Users email messages are being delivered in Exchange Online but senders may receive incorrect non\u2011delivery reports.<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>04\/10\/2026 14:10:00<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>04\/10\/2026 12:15:32<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td><\/td>\n<\/tr>\n<tr>\n<th>Latest Message<\/th>\n<td>Title: Users email messages are being delivered in Exchange Online but senders may receive incorrect non\u2011delivery reports<\/p>\n<p>  User impact: Users email messages are being delivered in Exchange Online but senders may receive incorrect non\u2011delivery reports.<\/p>\n<p>  More info: Senders may see delivery failures or non\u2011delivery reports (NDRs) indicating the recipient domain is unreachable, despite email messages being delivered successfully.  <\/p>\n<p>  Current status: We&#8217;re analyzing message replication and delivery confirmation behavior to isolate the root cause and develop a mitigation plan.  <\/p>\n<p>  Scope of impact: Impact is specific to some users attempting to send email messages in Exchange Online.  <\/p>\n<p>  Next update by: Friday, April 10, 2026, at 4:30 PM UTC<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\u30bf\u30a4\u30c8\u30eb:\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u306fExchange Online\u3067\u914d\u4fe1\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u9001\u4fe1\u8005\u304c\u8aa4\u3063\u305f\u672a\u914d\u9054\u5831\u544a\u3092\u53d7\u3051\u53d6\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n<p>  \u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u306fExchange 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