{"id":459,"date":"2026-04-29T10:38:13","date_gmt":"2026-04-29T01:38:13","guid":{"rendered":"https:\/\/falcon21.space\/kazuya\/work\/?p=459"},"modified":"2026-04-29T10:38:13","modified_gmt":"2026-04-29T01:38:13","slug":"smtpd-improper-command-pipelining-%e3%81%a8%e3%81%af","status":"publish","type":"post","link":"https:\/\/falcon21.space\/kazuya\/work\/?p=459","title":{"rendered":"smtpd improper command pipelining \u3068\u306f"},"content":{"rendered":"\n

*************************************************************************************************************<\/p>\n\n\n\n

improper command pipelining\uff08\u4e0d\u9069\u5207\u306aSMTP\u30b3\u30de\u30f3\u30c9\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\uff09\u3068\u306f\u3001\u30e1\u30fc\u30eb\u9001\u4fe1\uff08SMTP\uff09\u4e2d\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30b5\u30fc\u30d0\u30fc\u306e\u5bfe\u5fdc\u72b6\u6cc1\u3092\u7121\u8996\u3057\u3001\u5fdc\u7b54\u3092\u5f85\u305f\u305a\u306b\u4e00\u62ec\u3067\u30b3\u30de\u30f3\u30c9\u3092\u9001\u4fe1\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u9055\u53cd\u30a8\u30e9\u30fc\u3067\u3059\u3002\u3053\u308c\u306f\u901a\u4fe1\u52b9\u7387\u5316\u306e\u6a5f\u80fd\u304c\u6b63\u3057\u304f\u4f7f\u308f\u308c\u3066\u304a\u3089\u305a\u3001\u4e3b\u306b\u30b9\u30d1\u30e0\u3084\u8a2d\u5b9a\u30df\u30b9\u3068\u3057\u3066\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\uff08Synology MailPlus\u306a\u3069\uff09\u306b\u62d2\u5426\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

\u8a73\u7d30\u306a\u60c5\u5831
\u767a\u751f\u539f\u56e0:
\u9001\u4fe1\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3001\u53d7\u4fe1\u30b5\u30fc\u30d0\u30fc\u304c\u300cPIPELINING\u300d\u62e1\u5f35\u6a5f\u80fd\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u305b\u305a\u306b\u8907\u6570\u306e\u30b3\u30de\u30f3\u30c9\uff08MAIL FROM, RCPT TO\u306a\u3069\uff09\u3092\u540c\u6642\u306b\u9001\u4fe1\u3057\u305f\u3002<\/strong>
\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u304c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a\u3068\u3057\u3066\u300c\u4e0d\u6b63\u306a\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u30ea\u30af\u30a8\u30b9\u30c8\u300d\u3092\u62d2\u5426\u3057\u3066\u3044\u308b\u3002
\u89e3\u6c7a\u7b56:
\u9001\u4fe1\u8005\u306bSMTP\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3001RFC 2920\u898f\u683c\u306b\u6cbf\u3063\u305f\u5b9f\u88c5\u3092\u4f9d\u983c\u3059\u308b\u3002
\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\uff08MailPlus\uff09\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a\u3067\u3001\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u5236\u9650\u3092\u4e00\u6642\u7684\u306b\u7de9\u548c\u3059\u308b\uff08\u975e\u63a8\u5968\uff09\u3002
\u901a\u4fe1\u306e\u4ed5\u7d44\u307f: \u901a\u5e38\u3001SMTP\u306f\u30b3\u30de\u30f3\u30c9\u30fb\u5fdc\u7b54\u30921\u5f80\u5fa9\u3067\u884c\u3046\u304c\u3001\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u5316\u3059\u308b\u3068\u5fdc\u7b54\u3092\u5f85\u305f\u305a\u306b\u30b3\u30de\u30f3\u30c9\u3092\u9023\u7d9a\u3057\u3066\u9001\u4fe1\u3059\u308b\u3002\u3053\u306e\u969b\u3001RFC 2920\u3067\u5b9a\u3081\u3089\u308c\u305f\u30eb\u30fc\u30eb\uff08\u9806\u5e8f\u901a\u308a\u306b\u5fdc\u7b54\u3059\u308b\u3001\u306a\u3069\uff09\u3092\u5b88\u308b\u5fc5\u8981\u304c\u3042\u308b<\/p>\n\n\n\n

—————————————————————————————————–<\/p>\n\n\n\n

Improper command pipelining \u3068\u306f\u3001\u4e3b\u306b\u30e1\u30fc\u30eb\u9001\u4fe1\u30d7\u30ed\u30c8\u30b3\u30eb\uff08SMTP\uff09\u306b\u304a\u3044\u3066\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30b5\u30fc\u30d0\u30fc\u306e\u8a31\u53ef\u3092\u5f97\u308b\u524d\u3001\u3042\u308b\u3044\u306f\u30eb\u30fc\u30eb\u3092\u7121\u8996\u3057\u3066\u8907\u6570\u306e\u30b3\u30de\u30f3\u30c9\u3092\u307e\u3068\u3081\u3066\u9001\u3063\u3066\u3057\u307e\u3046\u4e0d\u6b63\u306a\u52d5\u4f5c\u306e\u3053\u3068\u3067\u3059\u3002
\u591a\u304f\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\uff08Postfix\u306a\u3069\uff09\u3067\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u7406\u7531\u304b\u3089\u3053\u306e\u52d5\u4f5c\u3092\u691c\u77e5\u3059\u308b\u3068\u63a5\u7d9a\u3092\u906e\u65ad\u3057\u3001\u300cImproper command pipelining\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u3092\u30ed\u30b0\u306b\u8a18\u9332\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

    \n
  1. \u305d\u3082\u305d\u3082\u300cPipelining\u300d\u3068\u306f\uff1f
    \u901a\u5e38\u3001SMTP\u306e\u3084\u308a\u53d6\u308a\u306f\u300c\u30b3\u30de\u30f3\u30c9\u3092\u9001\u308b\u300d\u2192\u300c\u5fdc\u7b54\u3092\u5f85\u3064\u300d\u3068\u3044\u3046\u4e00\u5f80\u5fa9\u305a\u3064\u306e\u5bfe\u8a71\u5f62\u5f0f\u3067\u884c\u308f\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u901a\u4fe1\u52b9\u7387\u3092\u4e0a\u3052\u308b\u305f\u3081\u306e\u62e1\u5f35\u6a5f\u80fd RFC 2920 (SMTP Service Extension for Command Pipelining) \u3067\u306f\u3001\u8907\u6570\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4e00\u5ea6\u306b\u307e\u3068\u3081\u3066\u9001\u4fe1\u3059\u308b\u3053\u3068\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u307e\u3059<\/li>\n\n\n\n
  2. \u306a\u305c\u300cImproper\uff08\u4e0d\u9069\u5207\uff09\u300d\u306b\u306a\u308b\u306e\u304b\uff1f
    \u4ee5\u4e0b\u306e\u30b1\u30fc\u30b9\u3067\u300c\u4e0d\u9069\u5207\u300d\u3068\u5224\u65ad\u3055\u308c\u307e\u3059\u3002
    \u8a31\u53ef\u524d\u306e\u9001\u4fe1: \u30b5\u30fc\u30d0\u30fc\u304c Pipelining \u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u4f1d\u3048\u308b\u524d\uff08EHLO\u5fdc\u7b54\u306e\u524d\u306a\u3069\uff09\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u52dd\u624b\u306b\u30b3\u30de\u30f3\u30c9\u3092\u307e\u3068\u3081\u3066\u9001\u3063\u305f\u5834\u5408\u3002
    \u7981\u6b62\u30d5\u30a7\u30fc\u30ba\u3067\u306e\u4f7f\u7528: \u307e\u3068\u3081\u3066\u9001\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u7279\u5b9a\u306e\u30b3\u30de\u30f3\u30c9\uff08DATA\u30b3\u30de\u30f3\u30c9\u306e\u5f8c\u306a\u3069\uff09\u306e\u76f4\u5f8c\u306b\u3001\u5fdc\u7b54\u3092\u5f85\u305f\u305a\u6b21\u306e\u30c7\u30fc\u30bf\u3092\u6d41\u3057\u8fbc\u3093\u3060\u5834\u5408\u3002
    \u30b9\u30d1\u30e0\u5bfe\u7b56: \u30b9\u30d1\u30e0\u9001\u4fe1\u30bd\u30d5\u30c8\u306f\u52b9\u7387\u3092\u512a\u5148\u3057\u3066\u5f37\u5f15\u306b\u30b3\u30de\u30f3\u30c9\u3092\u9001\u308a\u3064\u3051\u308b\u3053\u3068\u304c\u591a\u3044\u305f\u3081\u3001\u6b63\u898f\u306e\u30eb\u30fc\u30eb\u3092\u5b88\u3089\u306a\u3044 Pipelining \u306f\u30b9\u30d1\u30e0\u306e\u5146\u5019\u3068\u3057\u3066\u30d6\u30ed\u30c3\u30af\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n\n\n\n
  3. \u4e3b\u306a\u767a\u751f\u539f\u56e0
    \u30e1\u30fc\u30eb\u30bd\u30d5\u30c8\u306e\u30d0\u30b0: \u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306e Thunderbird \u3084\u305d\u306e\u4ed6\u306e\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u5fdc\u7b54\u3092\u5f85\u305f\u305a\u306b\u5148\u8d70\u308a\u3057\u3066\u30b3\u30de\u30f3\u30c9\u3092\u9001\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002
    \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306e\u5f71\u97ff: \u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084\u30a2\u30f3\u30c1\u30a6\u30a4\u30eb\u30b9\u30bd\u30d5\u30c8\u304c SMTP \u901a\u4fe1\u3092\u691c\u67fb\u30fb\u6539\u5909\u3057\u305f\u969b\u306b\u3001\u540c\u671f\u304c\u30ba\u30ec\u3066\u3053\u306e\u30a8\u30e9\u30fc\u304c\u8a98\u767a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002
    \u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a\u306e\u4e0d\u4e00\u81f4: \u30b5\u30fc\u30d0\u30fc\u5074\u3067 Pipelining \u3092\u53b3\u683c\u306b\u5236\u9650\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u4e00\u90e8\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u306e\u76f8\u6027\u554f\u984c\u3067\u767a\u751f\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n

    \u89e3\u6c7a\u306e\u30d2\u30f3\u30c8:
    \u3053\u306e\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3057\u305f\u5834\u5408\u306f\u3001\u307e\u305a\u30e1\u30fc\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u8a66\u3059\u304b\u3001\u30b5\u30fc\u30d0\u30fc\u7ba1\u7406\u8005\u3067\u3042\u308c\u3070 Postfix \u306e\u8a2d\u5b9a\u3067 smtpd_data_restrictions \u3084 Pipelining \u95a2\u9023\u306e\u5236\u9650\u3092\u7de9\u548c\u3059\u308b\u3053\u3068\u3067\u89e3\u6d88\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n\n\n\n

    ***********************************************************************************************************<\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    ************************************************************************************************************* […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-459","post","type-post","status-publish","format-standard","hentry","category-1"],"_links":{"self":[{"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/posts\/459","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=459"}],"version-history":[{"count":1,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/posts\/459\/revisions"}],"predecessor-version":[{"id":460,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=\/wp\/v2\/posts\/459\/revisions\/460"}],"wp:attachment":[{"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=459"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=459"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/falcon21.space\/kazuya\/work\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=459"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}