{"id":18375,"date":"2026-09-05T02:02:09","date_gmt":"2026-09-04T17:02:09","guid":{"rendered":"https:\/\/m365jp.net\/?p=18375"},"modified":"2026-09-05T02:03:56","modified_gmt":"2026-09-04T17:03:56","slug":"servicerestored-ex1467029-exchange-online-users-may-experience-delays-sending-and-receiving-email-messages-from-external-domains-in-exchange-online","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-05-servicerestored-ex1467029-exchange-online-users-may-experience-delays-sending-and-receiving-email-messages-from-external-domains-in-exchange-online","title":{"rendered":"[serviceRestored] EX1467029 | Exchange Online | Users may experience delays sending and receiving email messages from external domains in Exchange Online"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">EX1467029 | Exchange Online | Users may experience delays sending and receiving email messages from external domains in Exchange Online<\/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\">serviceRestored<\/td>\n<\/tr>\n<tr>\n<th>Classification<\/th>\n<td>incident<\/td>\n<\/tr>\n<tr>\n<th>User Impact<\/th>\n<td>Users may have experienced a delay in sending and receiving email messages from external domains in Exchange Online.<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>09\/04\/2026 16:15:46<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>09\/04\/2026 09:00:00<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>09\/04\/2026 15:15:00<\/td>\n<\/tr>\n<tr>\n<th>Latest Message<\/th>\n<td>Title: Users may experience delays sending and receiving email messages from external domains in Exchange Online<\/p>\n<p>  User impact: Users may have experienced a delay in sending and receiving email messages from external domains in Exchange Online.<\/p>\n<p>  More info: Users may have experienced intermittent \u201cServer busy\u201d errors, affecting multiple mailboxes.<\/p>\n<p>  Depending on the client, the service should attempt to periodically retry sending the email previously impacted by the issue. If the initial sender received an NDR after 24-72 hours (different clients or email providers can vary), they will need to send a new   email.<\/p>\n<p>  Final status: We&#8217;ve confirmed that the issue is resolved after an extended period of monitoring, and receiving additional confirmations from previously impacted organizations.<\/p>\n<p>  Scope of impact: This issue impacted users who may have been attempting to send and receive email messages from external domains in Exchange Online.<\/p>\n<p>  Start time: Friday, September 4, 2026, at 9:00 AM UTC<\/p>\n<p>  End time: Friday, September 4, 2026, at 3:15 PM UTC<\/p>\n<p>  Preliminary root cause: The enforcement of a specific anti-spam model contributed to impact for a subset of email traffic. We&#8217;ll provide more details within the Post-Incident Report.<\/p>\n<p>  Next Steps:<br \/>  &#8211; We&#8217;re reviewing model classifications, rule configurations and upstream data pipelines to determine why the anti-spam model started to impact a subset of email traffic.<\/p>\n<p>  We&#8217;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<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>EX1467029 | Exchange Online | Users may experience delays sending and receiving email messages from external d [&hellip;]<\/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-18375","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18375","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=18375"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18375\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}