{"id":5027,"date":"2024-02-07T01:01:19","date_gmt":"2024-02-06T16:01:19","guid":{"rendered":"https:\/\/m365jp.tk\/?p=5027"},"modified":"2024-02-07T01:08:14","modified_gmt":"2024-02-06T16:08:14","slug":"servicerestored-ex703958-exchange-online-some-users-may-be-unable-to-send-or-receive-email-messages-and-receive-a-non-delivery-report-ndr-when-sending-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2024-02-07-servicerestored-ex703958-exchange-online-some-users-may-be-unable-to-send-or-receive-email-messages-and-receive-a-non-delivery-report-ndr-when-sending-2","title":{"rendered":"[serviceRestored] EX703958 | Exchange Online | Some users may be unable to send or receive email messages, and receive a Non-Delivery Report (NDR) when sending"},"content":{"rendered":"
\n
\n
\n\n\n\n
EX703958 | Exchange Online | Some users may be unable to send or receive email messages, and receive a Non-Delivery Report (NDR) when sending<\/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>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to send or receive email messages, and receive an NDR with a 550 or 554 error code when sending.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/06\/2024 15:45:42<\/td>\n<\/tr>\n
Start Time<\/th>\n12\/25\/2023 00:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n02\/05\/2024 22:13:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to send or receive email messages, and receive a Non-Delivery Report (NDR) when sending<\/p>\n

User impact: Users were unable to send or receive email messages, and received an NDR with a 550 or 554 error code when sending.<\/p>\n

More info: This issue only occurred if either the sender or user who was receiving the message was utilizing a specific third-party anti-spam service. Senders received the NDR which stated that the message was rejected due to a 550 or 554 error code and that their host IP address was listed on the third-party anti-spam service.<\/p>\n

The error messages stated “550 5.7.350 Remote server returned message detected as spam”, “554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked”, or “\u200e550 5.7.1 This email was rejected because it violates our security policy.”<\/p>\n

We recommend that users retry sending email messages that previously returned NDRs, as this should now prove successful. <\/p>\n

Final status: We’ve confirmed after extensive monitoring that our work to unblock affected IP addresses has successfully reduced the rate of impacted mail flow to pre-incident thresholds, mitigating impact for users.<\/p>\n

Scope of impact: This issue may have affected any user’s mail flow if the recipient was leveraging a specific third-party antispam service to filter email messages.<\/p>\n

Start time: Thursday, December 25, 2023, at 12:00 AM UTC<\/p>\n

End time: Monday, February 5, 2024, at 10:13 PM UTC<\/p>\n

Preliminary root cause: Outbound spam associated with some Microsoft IP addresses was causing all mail from these addresses to be blocked by a specific third-party antispam service.<\/p>\n

Next steps:
– We’re exploring monitoring optimizations so we can more quickly identify and work to delist blocked IPs should similar future events occur.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb: \u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u96fb\u5b50\u30e1\u30fc\u30eb \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u53d7\u4fe1\u3067\u304d\u305a\u3001\u9001\u4fe1\u6642\u306b\u914d\u4fe1\u4e0d\u80fd\u30ec\u30dd\u30fc\u30c8 (NDR) \u3092\u53d7\u4fe1\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff: \u30e6\u30fc\u30b6\u30fc\u304c\u96fb\u5b50\u30e1\u30fc\u30eb \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u53d7\u4fe1\u3067\u304d\u305a\u3001\u9001\u4fe1\u6642\u306b 550 \u307e\u305f\u306f 554 \u30a8\u30e9\u30fc \u30b3\u30fc\u30c9\u3092\u542b\u3080 NDR \u3092\u53d7\u4fe1\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831: \u3053\u306e\u554f\u984c\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u4fe1\u3057\u3066\u3044\u305f\u9001\u4fe1\u8005\u307e\u305f\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u3044\u305a\u308c\u304b\u304c\u7279\u5b9a\u306e\u30b5\u30fc\u30c9 \u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30d1\u30e0\u5bfe\u7b56\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u306e\u307f\u767a\u751f\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u9001\u4fe1\u8005\u306f\u3001550 \u307e\u305f\u306f 554 \u30a8\u30e9\u30fc \u30b3\u30fc\u30c9\u304c\u539f\u56e0\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u62d2\u5426\u3055\u308c\u3001\u30db\u30b9\u30c8 IP \u30a2\u30c9\u30ec\u30b9\u304c\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30d1\u30e0\u5bfe\u7b56\u30b5\u30fc\u30d3\u30b9\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3059 NDR \u3092\u53d7\u4fe1\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u306f\u3001\u300c550 5.7.350\u30ea\u30e2\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u304c\u30b9\u30d1\u30e0\u3068\u3057\u3066\u691c\u51fa\u3055\u308c\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8fd4\u3057\u307e\u3057\u305f\u300d\u3001\u300c554 5.7.1\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 \u30db\u30b9\u30c8 [xxx.xxx.xxx.xxx] \u304c\u30d6\u30ed\u30c3\u30af\u3055\u308c\u307e\u3057\u305f\u300d\u3001\u307e\u305f\u306f\u300c?550 5.7.1 \u3053\u306e\u30e1\u30fc\u30eb\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 \u30dd\u30ea\u30b7\u30fc\u306b\u9055\u53cd\u3057\u3066\u3044\u308b\u305f\u3081\u62d2\u5426\u3055\u308c\u307e\u3057\u305f\u3002\u300d<\/p>\n

\u4ee5\u524d\u306b NDR \u3092\u8fd4\u3057\u305f\u96fb\u5b50\u30e1\u30fc\u30eb \u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u9001\u4fe1\u306f\u6210\u529f\u3059\u308b\u306f\u305a\u3067\u3059\u306e\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u518d\u8a66\u884c\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n

\u6700\u7d42\u30b9\u30c6\u30fc\u30bf\u30b9: \u5e83\u7bc4\u306a\u76e3\u8996\u306e\u7d50\u679c\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f IP \u30a2\u30c9\u30ec\u30b9\u306e\u30d6\u30ed\u30c3\u30af\u3092\u89e3\u9664\u3059\u308b\u305f\u3081\u306e\u4f5c\u696d\u306b\u3088\u308a\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e1\u30fc\u30eb \u30d5\u30ed\u30fc\u306e\u30ec\u30fc\u30c8\u304c\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u524d\u306e\u3057\u304d\u3044\u5024\u307e\u3067\u6e1b\u5c11\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff\u304c\u8efd\u6e1b\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u306e\u7bc4\u56f2: \u3053\u306e\u554f\u984c\u306f\u3001\u53d7\u4fe1\u8005\u304c\u7279\u5b9a\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30d1\u30e0\u5bfe\u7b56\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3057\u3066\u96fb\u5b50\u30e1\u30fc\u30eb \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30d5\u30a3\u30eb\u30bf\u30fc\u51e6\u7406\u3057\u3066\u3044\u305f\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb \u30d5\u30ed\u30fc\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u523b: 2023 \u5e74 12 \u6708 25 \u65e5 (\u6728) 12:00 AM UTC<\/p>\n

\u7d42\u4e86\u6642\u523b: 2024 \u5e74 2 \u6708 5 \u65e5 (\u6708) \u5348\u5f8c 10 \u6642 13 \u5206 (UTC)<\/p>\n

\u66ab\u5b9a\u7684\u306a\u6839\u672c\u539f\u56e0: \u4e00\u90e8\u306e Microsoft IP \u30a2\u30c9\u30ec\u30b9\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f\u9001\u4fe1\u30b9\u30d1\u30e0\u306b\u3088\u308a\u3001\u3053\u308c\u3089\u306e\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u306e\u3059\u3079\u3066\u306e\u30e1\u30fc\u30eb\u304c\u7279\u5b9a\u306e\u30b5\u30fc\u30c9 \u30d1\u30fc\u30c6\u30a3\u306e\u30b9\u30d1\u30e0\u5bfe\u7b56\u30b5\u30fc\u30d3\u30b9\u306b\u3088\u3063\u3066\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u4eca\u5f8c\u540c\u69d8\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u3001\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f IP \u3092\u3088\u308a\u8fc5\u901f\u306b\u7279\u5b9a\u3057\u3001\u30ea\u30b9\u30c8\u304b\u3089\u9664\u5916\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u76e3\u8996\u306e\u6700\u9069\u5316\u3092\u691c\u8a0e\u3057\u3066\u3044\u307e\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX703958 | Exchange Online | Some users may be unable to send or receive email messages, and receive a Non-Del […]<\/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-5027","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/5027","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=5027"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/5027\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=5027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=5027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=5027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}