{"id":14675,"date":"2026-01-26T18:00:46","date_gmt":"2026-01-26T09:00:46","guid":{"rendered":"https:\/\/m365jp.net\/?p=14675"},"modified":"2026-01-26T18:01:20","modified_gmt":"2026-01-26T09:01:20","slug":"servicerestored-ex1221076-exchange-online-users-may-have-been-unable-to-delete-email-messages-after-running-the-quit-command-through-the-pop3-connection-method","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-01-26-servicerestored-ex1221076-exchange-online-users-may-have-been-unable-to-delete-email-messages-after-running-the-quit-command-through-the-pop3-connection-method","title":{"rendered":"[serviceRestored] EX1221076 | Exchange Online | Users may have been unable to delete email messages after running the QUIT command through the POP3 connection method"},"content":{"rendered":"
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EX1221076 | Exchange Online | Users may have been unable to delete email messages after running the QUIT command through the POP3 connection method<\/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 have been unable to delete email messages after running the QUIT command through the POP3 connection method.<\/td>\n<\/tr>\n
Last Updated<\/th>\n01\/26\/2026 08:47:56<\/td>\n<\/tr>\n
Start Time<\/th>\n01\/20\/2026 05:01:00<\/td>\n<\/tr>\n
End Time<\/th>\n01\/26\/2026 05:19:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may have been unable to delete email messages after running the QUIT command through the POP3 connection method<\/p>\n

User impact: Users may have been unable to delete email messages after running the QUIT command through the POP3 connection method.<\/p>\n

More info: Specifically, POP3 users could read and download their email messages, but any messages they deleted may not have actually been removed, because the session failed to close properly. If a message was deleted on Exchange Online using the DELE command, the POP3 QUIT command may have failed, preventing the session from closing cleanly and caused messages marked for deletion to remain in the mailbox.<\/p>\n

If the user was not using POP3, they were not impacted.<\/p>\n

Final status: We\u2019ve confirmed that the fix deployment has completed successfully and that the issue has been fully resolved.<\/p>\n

Scope of impact: Impact was specific to some users attempting to delete email messages after running the QUIT command using POP3 connection method.<\/p>\n

Start time: Tuesday, January 20, 2026, at 5:01 AM UTC<\/p>\n

End time: Saturday, January 24, 2026, at 5:19 AM UTC<\/p>\n

Root cause: A package version conflict introduced a regression that caused the POP3 QUIT command to fail after a DELE operation.<\/p>\n

Next steps:
– We’re reviewing our package provisioning procedures to help prevent similar problems 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:\u30e6\u30fc\u30b6\u30fc\u306fPOP3\u63a5\u7d9a\u30e1\u30bd\u30c3\u30c9\u3067QUIT\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u5f8c\u3001\u30e1\u30fc\u30eb\u3092\u524a\u9664\u3067\u304d\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:POP3\u63a5\u7d9a\u65b9\u5f0f\u3067QUIT\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u5f8c\u3001\u30e1\u30fc\u30eb\u3092\u524a\u9664\u3067\u304d\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30:\u5177\u4f53\u7684\u306b\u306f\u3001POP3\u30e6\u30fc\u30b6\u30fc\u306f\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8aad\u3093\u3067\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u307e\u3057\u305f\u304c\u3001\u524a\u9664\u3057\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u6b63\u3057\u304f\u9589\u3058\u3089\u308c\u306a\u304b\u3063\u305f\u305f\u3081\u3001\u5b9f\u969b\u306b\u306f\u524a\u9664\u3055\u308c\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3082\u3057DELE\u30b3\u30de\u30f3\u30c9\u3067Exchange Online\u4e0a\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001POP3\u306eQUIT\u30b3\u30de\u30f3\u30c9\u304c\u5931\u6557\u3057\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u304d\u308c\u3044\u306b\u9589\u3058\u3089\u308c\u305a\u3001\u524a\u9664\u5bfe\u8c61\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u6b8b\u3063\u305f\u307e\u307e\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u304cPOP3\u3092\u4f7f\u7528\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u5f71\u97ff\u3092\u53d7\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u4fee\u6b63\u5c55\u958b\u304c\u6210\u529f\u88cf\u306b\u5b8c\u4e86\u3057\u3001\u554f\u984c\u306f\u5b8c\u5168\u306b\u89e3\u6c7a\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:POP3\u63a5\u7d9a\u65b9\u5f0f\u3067QUIT\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u5f8c\u306b\u30e1\u30fc\u30eb\u3092\u524a\u9664\u3057\u3088\u3046\u3068\u3057\u305f\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u7279\u6709\u306e\u3082\u306e\u3067\u3057\u305f\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e741\u670820\u65e5\u706b\u66dc\u65e5 \u5348\u524d5\u664201\u5206 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e741\u670824\u65e5\u571f\u66dc\u65e5 \u5348\u524d5\u664219\u5206 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u885d\u7a81\u306b\u3088\u308a\u3001DELE\u64cd\u4f5c\u5f8c\u306bPOP3\u306eCIT\u30b3\u30de\u30f3\u30c9\u304c\u5931\u6557\u3059\u308b\u56de\u5e30\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u4eca\u5f8c\u540c\u69d8\u306e\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30d7\u30ed\u30d3\u30b8\u30e7\u30cb\u30f3\u30b0\u624b\u9806\u3092\u898b\u76f4\u3057\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":"

EX1221076 | Exchange Online | Users may have been unable to delete email messages after running the QUIT comma […]<\/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-14675","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14675","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=14675"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14675\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}