{"id":293,"date":"2024-02-15T16:28:27","date_gmt":"2024-02-15T16:28:27","guid":{"rendered":"https:\/\/www.freesmtpserver.net\/?p=293"},"modified":"2024-02-15T16:28:27","modified_gmt":"2024-02-15T16:28:27","slug":"smtp-%e3%81%a8%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b-2","status":"publish","type":"post","link":"https:\/\/www.freesmtpserver.net\/ja\/smtp-%e3%81%a8%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b-2\/","title":{"rendered":"SMTP\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3057\u307e\u3059\u304b\uff1f"},"content":{"rendered":"

\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6210\u529f\u306e\u9375\u3068\u306a\u308b\u5e83\u5927\u306a\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u74b0\u5883\u306b\u304a\u3044\u3066\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u306f\u6700\u3082\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u306e 1 \u3064\u3067\u3059\u3002\u30b7\u30fc\u30e0\u30ec\u30b9\u306a\u96fb\u5b50\u30e1\u30fc\u30eb\u914d\u4fe1\u306e\u821e\u53f0\u88cf\u306b\u306f\u3001SMTP (Simple Mail Transfer Protocol) \u3068\u3057\u3066\u77e5\u3089\u308c\u308b\u91cd\u8981\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001SMTP \u306e\u8907\u96d1\u3055\u3092\u6398\u308a\u4e0b\u3052\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u901a\u4fe1\u306b\u304a\u3051\u308b\u305d\u306e\u57fa\u672c\u7684\u306a\u5f79\u5272\u3068\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u914d\u4fe1\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306b SMTP \u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u63a2\u308a\u307e\u3059\u3002<\/p>\n

<\/p>\n

SMTP \u306e\u5b9a\u7fa9<\/strong><\/h3>\n

SMTP (Simple Mail Transfer Protocol) \u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u96fb\u5b50\u30e1\u30fc\u30eb (\u96fb\u5b50\u30e1\u30fc\u30eb) \u306e\u8ee2\u9001\u3092\u7ba1\u7406\u3059\u308b\u4e00\u9023\u306e\u30eb\u30fc\u30eb\u3067\u3059\u3002 1980 \u5e74\u4ee3\u521d\u982d\u306b\u958b\u767a\u3055\u308c\u305f SMTP \u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u901a\u4fe1\u306e\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3001\u7570\u306a\u308b\u30b5\u30fc\u30d0\u30fc\u3068\u96fb\u5b50\u30e1\u30fc\u30eb \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u9593\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u53d7\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n

SMTP \u306e\u4ed5\u7d44\u307f<\/strong><\/h3>\n

1. \u96fb\u5b50\u30e1\u30fc\u30eb\u9001\u4fe1\u306e\u958b\u59cb:<\/strong><\/h4>\n

\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u9001\u4fe1\u30d7\u30ed\u30bb\u30b9\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4f5c\u6210\u3057\u3001\u96fb\u5b50\u30e1\u30fc\u30eb \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u300c\u9001\u4fe1\u300d\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u3068\u59cb\u307e\u308a\u307e\u3059\u3002\u6b21\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f SMTP \u30b5\u30fc\u30d0\u30fc\u3068\u306e\u63a5\u7d9a\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002<\/p>\n

2. \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3068\u8a8d\u8a3c:<\/strong><\/h4>\n

\u63a5\u7d9a\u6642\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068 SMTP \u30b5\u30fc\u30d0\u30fc\u306e\u9593\u3067\u4e00\u9023\u306e\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u4e21\u65b9\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u52b9\u679c\u7684\u306b\u901a\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u624b\u9806\u3067\u3059\u3002\u3055\u3089\u306b\u3001\u9001\u4fe1\u8005\u306e\u6b63\u5f53\u6027\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u540d\u3084\u30d1\u30b9\u30ef\u30fc\u30c9\u306a\u3069\u306e\u8a8d\u8a3c\u30e1\u30ab\u30cb\u30ba\u30e0\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

3. \u30e1\u30c3\u30bb\u30fc\u30b8\u8ee2\u9001:<\/strong><\/h4>\n

\u63a5\u7d9a\u304c\u78ba\u7acb\u3055\u308c\u3001\u8a8d\u8a3c\u304c\u6210\u529f\u3059\u308b\u3068\u3001\u96fb\u5b50\u30e1\u30fc\u30eb \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u96fb\u5b50\u30e1\u30fc\u30eb \u30e1\u30c3\u30bb\u30fc\u30b8\u3092 SMTP \u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u51e6\u7406\u3057\u3001\u30a8\u30e9\u30fc\u3084\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u554f\u984c\u304c\u306a\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n

4. \u53d7\u4fe1\u8005\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0:<\/strong><\/h4>\n

\u51e6\u7406\u5f8c\u3001SMTP \u30b5\u30fc\u30d0\u30fc\u306f\u53d7\u4fe1\u8005\u306e\u96fb\u5b50\u30e1\u30fc\u30eb \u30c9\u30e1\u30a4\u30f3\u3092\u7279\u5b9a\u3057\u3001DNS (\u30c9\u30e1\u30a4\u30f3 \u30cd\u30fc\u30e0 \u30b7\u30b9\u30c6\u30e0) \u3092\u4f7f\u7528\u3057\u3066\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb \u30b5\u30fc\u30d0\u30fc\u3092\u898b\u3064\u3051\u307e\u3059\u3002\u6b21\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u306f\u53d7\u4fe1\u8005\u306e SMTP \u30b5\u30fc\u30d0\u30fc\u3068\u306e\u63a5\u7d9a\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002<\/p>\n

5. \u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3078\u306e\u914d\u4fe1:<\/strong><\/h4>\n

\u63a5\u7d9a\u304c\u6210\u529f\u3059\u308b\u3068\u3001\u53d7\u4fe1\u8005\u306e SMTP \u30b5\u30fc\u30d0\u30fc\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u4fe1\u3057\u3001\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002\u53d7\u4fe1\u8005\u306f\u3001\u5f8c\u3067\u96fb\u5b50\u30e1\u30fc\u30eb \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u307e\u305f\u306f Web \u30e1\u30fc\u30eb \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n

SMTP \u306e\u4e3b\u8981\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/strong><\/h3>\n

1. \u30e1\u30fc\u30eb\u8ee2\u9001\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8 (MTA):<\/strong><\/h4>\n

MTA \u306f\u3001\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u8ee2\u9001\u3092\u62c5\u5f53\u3059\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u9001\u4fe1\u306e\u521d\u671f\u6bb5\u968e\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u6b63\u3057\u3044\u5b9b\u5148\u306b\u78ba\u5b9f\u306b\u9001\u4fe1\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n

2. \u30e1\u30fc\u30eb\u914d\u4fe1\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8 (MDA):<\/strong><\/h4>\n

MDA \u306f\u3001\u53d7\u4fe1\u8005\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u3078\u306e\u96fb\u5b50\u30e1\u30fc\u30eb\u306e\u914d\u4fe1\u3092\u51e6\u7406\u3057\u307e\u3059\u3002 MTA \u3068\u9023\u643a\u3057\u3066\u52d5\u4f5c\u3057\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u304c\u6700\u7d42\u5b9b\u5148\u306b\u5230\u9054\u3057\u3001\u9069\u5207\u306b\u4fdd\u5b58\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n

3. SMTP \u30b3\u30de\u30f3\u30c9:<\/strong><\/h4>\n

SMTP \u901a\u4fe1\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u30fc\u9593\u3067\u4ea4\u63db\u3055\u308c\u308b\u4e00\u9023\u306e\u30b3\u30de\u30f3\u30c9\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b3\u30de\u30f3\u30c9\u306b\u306f\u3001EHLO (Extended Hello)\u3001MAIL FROM\u3001RCPT TO\u3001DATA\u3001QUIT \u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u305e\u308c\u304c\u96fb\u5b50\u30e1\u30fc\u30eb\u9001\u4fe1\u30d7\u30ed\u30bb\u30b9\u3067\u7279\u5b9a\u306e\u76ee\u7684\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n

\u8ab2\u984c\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56<\/strong><\/h3>\n

SMTP \u306f\u305d\u306e\u91cd\u8981\u306a\u5f79\u5272\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u7279\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u9762\u3067\u8ab2\u984c\u306b\u76f4\u9762\u3057\u3066\u3044\u307e\u3059\u3002 SMTP \u306f\u30aa\u30fc\u30d7\u30f3\u306a\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u60aa\u610f\u306e\u3042\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u30b9\u30d1\u30e0\u9001\u4fe1\u3084\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u306a\u3069\u306e\u6d3b\u52d5\u306b SMTP \u3092\u60aa\u7528\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u61f8\u5ff5\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306b\u3001STARTTLS \u306a\u3069\u306e\u6697\u53f7\u5316\u30d7\u30ed\u30c8\u30b3\u30eb\u3084\u3001SPF (Sender Policy Framework) \u3084 DKIM (DomainKeys Identified Mail) \u306a\u3069\u306e\u8a8d\u8a3c\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u542b\u3080\u3001\u3055\u307e\u3056\u307e\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u7d50\u8ad6<\/strong><\/h3>\n

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