{"id":11741,"date":"2025-11-19T17:54:45","date_gmt":"2025-11-19T08:54:45","guid":{"rendered":"https:\/\/rakkoserver.com\/plus\/?p=11741"},"modified":"2026-01-30T10:40:56","modified_gmt":"2026-01-30T01:40:56","slug":"tool-mailaddress-check-existence","status":"publish","type":"post","link":"https:\/\/rakkoserver.com\/plus\/tool-mailaddress-check-existence\/","title":{"rendered":"\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u78ba\u8a8d\u30c4\u30fc\u30eb"},"content":{"rendered":"\n<div id=\"emailExistenceChecker\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;\">\n  <style>\n    #emailExistenceChecker * {\n      box-sizing: border-box;\n    }\n    #emailExistenceChecker {\n      max-width: 100%;\n      color: #333;\n    }\n    #emailExistenceChecker .eec-input-section {\n      margin-bottom: 20px;\n    }\n    #emailExistenceChecker .eec-label {\n      font-size: 16px;\n      font-weight: 600;\n      margin-bottom: 8px;\n      display: block;\n      color: #333;\n    }\n    #emailExistenceChecker .eec-textarea {\n      width: 100%;\n      min-height: 150px;\n      padding: 12px;\n      border: 1px solid #ddd;\n      border-radius: 4px;\n      font-size: 14px;\n      font-family: monospace;\n      resize: vertical;\n      transition: border-color 0.2s;\n    }\n    #emailExistenceChecker .eec-textarea:focus {\n      outline: none;\n      border-color: #13284B;\n    }\n    #emailExistenceChecker .eec-button-group {\n      display: flex;\n      gap: 10px;\n      margin-bottom: 20px;\n    }\n    #emailExistenceChecker .eec-button {\n      padding: 12px 24px;\n      border: none;\n      border-radius: 4px;\n      font-size: 14px;\n      font-weight: 600;\n      cursor: pointer;\n      transition: opacity 0.2s;\n      color: #fff;\n    }\n    #emailExistenceChecker .eec-button:disabled {\n      opacity: 0.5;\n      cursor: not-allowed;\n    }\n    #emailExistenceChecker .eec-button-primary {\n      background-color: #13284B;\n    }\n    #emailExistenceChecker .eec-button-primary:not(:disabled):hover {\n      opacity: 0.9;\n    }\n    #emailExistenceChecker .eec-button-secondary {\n      background-color: #666;\n    }\n    #emailExistenceChecker .eec-button-secondary:not(:disabled):hover {\n      opacity: 0.9;\n    }\n    #emailExistenceChecker .eec-loading {\n      display: none;\n      text-align: center;\n      padding: 20px;\n      color: #666;\n    }\n    #emailExistenceChecker .eec-loading.active {\n      display: block;\n    }\n    #emailExistenceChecker .eec-spinner {\n      border: 3px solid #f3f3f3;\n      border-top: 3px solid #13284B;\n      border-radius: 50%;\n      width: 40px;\n      height: 40px;\n      animation: eec-spin 1s linear infinite;\n      margin: 0 auto 10px;\n    }\n    @keyframes eec-spin {\n      0% { transform: rotate(0deg); }\n      100% { transform: rotate(360deg); }\n    }\n    #emailExistenceChecker .eec-results {\n      display: none;\n    }\n    #emailExistenceChecker .eec-results.active {\n      display: block;\n    }\n    #emailExistenceChecker .eec-summary {\n      display: flex;\n      gap: 15px;\n      margin-bottom: 20px;\n      flex-wrap: wrap;\n    }\n    #emailExistenceChecker .eec-summary-item {\n      flex: 1;\n      min-width: 150px;\n      padding: 15px;\n      border-radius: 6px;\n      text-align: center;\n      background-color: #f5f5f5;\n    }\n    #emailExistenceChecker .eec-summary-label {\n      font-size: 13px;\n      color: #666;\n      margin-bottom: 5px;\n    }\n    #emailExistenceChecker .eec-summary-value {\n      font-size: 28px;\n      font-weight: 700;\n      color: #333;\n    }\n    #emailExistenceChecker .eec-summary-item.valid {\n      background-color: #e8f5e9;\n    }\n    #emailExistenceChecker .eec-summary-item.valid .eec-summary-value {\n      color: #2e7d32;\n    }\n    #emailExistenceChecker .eec-summary-item.invalid {\n      background-color: #ffebee;\n    }\n    #emailExistenceChecker .eec-summary-item.invalid .eec-summary-value {\n      color: #c62828;\n    }\n    #emailExistenceChecker .eec-summary-item.error {\n      background-color: #fff3e0;\n    }\n    #emailExistenceChecker .eec-summary-item.error .eec-summary-value {\n      color: #ef6c00;\n    }\n    #emailExistenceChecker .eec-result-actions {\n      margin-bottom: 15px;\n      display: flex;\n      gap: 10px;\n    }\n    #emailExistenceChecker .eec-copy-button {\n      padding: 8px 16px;\n      border: 1px solid #ddd;\n      border-radius: 4px;\n      background-color: #fff;\n      font-size: 13px;\n      cursor: pointer;\n      transition: background-color 0.2s;\n    }\n    #emailExistenceChecker .eec-copy-button:hover {\n      background-color: #f5f5f5;\n    }\n    #emailExistenceChecker .eec-table-wrapper {\n      overflow-x: auto;\n      border: 1px solid #ddd;\n      border-radius: 4px;\n    }\n    #emailExistenceChecker .eec-table {\n      width: 100%;\n      border-collapse: collapse;\n      font-size: 14px;\n      background-color: #fff;\n    }\n    #emailExistenceChecker .eec-table th {\n      background-color: #f5f5f5;\n      padding: 12px;\n      text-align: left;\n      font-weight: 600;\n      border-bottom: 2px solid #ddd;\n      color: #333;\n    }\n    #emailExistenceChecker .eec-table td {\n      padding: 12px;\n      border-bottom: 1px solid #eee;\n    }\n    #emailExistenceChecker .eec-table tr:last-child td {\n      border-bottom: none;\n    }\n    #emailExistenceChecker .eec-table tr:hover {\n      background-color: #fafafa;\n    }\n    #emailExistenceChecker .eec-status {\n      display: inline-block;\n      padding: 4px 10px;\n      border-radius: 3px;\n      font-size: 12px;\n      font-weight: 600;\n    }\n    #emailExistenceChecker .eec-status-valid {\n      background-color: #e8f5e9;\n      color: #2e7d32;\n    }\n    #emailExistenceChecker .eec-status-invalid {\n      background-color: #ffebee;\n      color: #c62828;\n    }\n    #emailExistenceChecker .eec-status-error {\n      background-color: #fff3e0;\n      color: #ef6c00;\n    }\n    #emailExistenceChecker .eec-format-valid {\n      color: #2e7d32;\n    }\n    #emailExistenceChecker .eec-format-invalid {\n      color: #c62828;\n    }\n    #emailExistenceChecker .eec-error-message {\n      padding: 15px;\n      background-color: #ffebee;\n      border-left: 4px solid #c62828;\n      color: #c62828;\n      margin-bottom: 20px;\n      border-radius: 4px;\n    }\n    #emailExistenceChecker .eec-copy-icon {\n      cursor: pointer;\n      opacity: 0.5;\n      transition: opacity 0.2s;\n      margin-left: 8px;\n      display: inline-block;\n      font-size: 12px;\n      color: #666;\n      text-decoration: underline;\n    }\n    #emailExistenceChecker .eec-copy-icon:hover {\n      opacity: 1;\n      color: #13284B;\n    }\n    #emailExistenceChecker .eec-copy-icon.copied {\n      color: #2e7d32;\n      opacity: 1;\n    }\n    #emailExistenceChecker .eec-copy-button.copied {\n      background-color: #e8f5e9;\n      color: #2e7d32;\n      border-color: #2e7d32;\n    }\n  <\/style>\n\n  <div class=\"eec-input-section\">\n    <label class=\"eec-label\">\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9 (\u6539\u884c\u533a\u5207\u308a\u3067\u8907\u6570\u5165\u529b\u53ef\u80fd)<\/label>\n    <textarea id=\"eecEmailInput\" class=\"eec-textarea\" placeholder=\"example@example.com\ntest@example.com\n...\"><\/textarea>\n  <\/div>\n\n  <div class=\"eec-button-group\">\n    <button id=\"eecCheckButton\" class=\"eec-button eec-button-primary\" disabled>\u30c1\u30a7\u30c3\u30af\u5b9f\u884c<\/button>\n    <button id=\"eecClearButton\" class=\"eec-button eec-button-secondary\">\u30af\u30ea\u30a2<\/button>\n  <\/div>\n\n  <div id=\"eecLoading\" class=\"eec-loading\">\n    <div class=\"eec-spinner\"><\/div>\n    <p>\u30c1\u30a7\u30c3\u30af\u4e2d\u2026<\/p>\n  <\/div>\n\n  <div id=\"eecError\" class=\"eec-error-message\" style=\"display: none;\"><\/div>\n\n  <div id=\"eecResults\" class=\"eec-results\">\n    <div class=\"eec-summary\">\n      <div class=\"eec-summary-item\">\n        <div class=\"eec-summary-label\">\u30c1\u30a7\u30c3\u30af\u5bfe\u8c61<\/div>\n        <div class=\"eec-summary-value\" id=\"eecTotalCount\">0<\/div>\n      <\/div>\n      <div class=\"eec-summary-item valid\">\n        <div class=\"eec-summary-label\">\u5b58\u5728\u3059\u308b<\/div>\n        <div class=\"eec-summary-value\" id=\"eecValidCount\">0<\/div>\n      <\/div>\n      <div class=\"eec-summary-item invalid\">\n        <div class=\"eec-summary-label\">\u5b58\u5728\u3057\u306a\u3044<\/div>\n        <div class=\"eec-summary-value\" id=\"eecInvalidCount\">0<\/div>\n      <\/div>\n      <div class=\"eec-summary-item error\">\n        <div class=\"eec-summary-label\">\u30c1\u30a7\u30c3\u30af\u4e0d\u53ef<\/div>\n        <div class=\"eec-summary-value\" id=\"eecErrorCount\">0<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eec-result-actions\">\n      <button id=\"eecCopyAllButton\" class=\"eec-copy-button\">\u7d50\u679c\u3092\u30b3\u30d4\u30fc (TSV)<\/button>\n    <\/div>\n\n    <div class=\"eec-table-wrapper\">\n      <table class=\"eec-table\">\n        <thead>\n          <tr>\n            <th>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9<\/th>\n            <th>\u7d50\u679c\u30b9\u30c6\u30fc\u30bf\u30b9<\/th>\n            <th>\u8a73\u7d30 (\u7406\u7531)<\/th>\n            <th>\u5f62\u5f0f<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody id=\"eecResultTableBody\">\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/div>\n\n  <script>\n\n  <\/script>\n<\/div>\n\n\n\n<p class=\"is-style-sango-paragraph-memo-alt\">\u30ad\u30e3\u30c3\u30c1\u30aa\u30fc\u30eb\u8a2d\u5b9a\uff08\u5168\u3066\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u53d7\u3051\u5165\u308c\u308b\u8a2d\u5b9a\uff09\u306e\u5834\u5408\u3001\u5b9f\u969b\u306b\u306f\u4e0d\u5728\u3067\u3082\u300c\u5b58\u5728\u3059\u308b\u300d\u3068\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u30c4\u30fc\u30eb\u306f\u3001\u5165\u529b\u3055\u308c\u305f\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u300c\u5b9f\u969b\u306b\u5b58\u5728\u3059\u308b\u304b\u300d\u300c\u30e1\u30fc\u30eb\u304c\u5230\u9054\u53ef\u80fd\u304b\u300d\u3092\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5f62\u5f0f\u30c1\u30a7\u30c3\u30af\u306b\u52a0\u3048\u3001\u76f8\u624b\u5148\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u3068\u76f4\u63a5\u901a\u4fe1\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u304c\u73fe\u5728\u5229\u7528\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-memo-alt\">\u5b9f\u969b\u306b\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b\u76f4\u524d\u3067\u901a\u4fe1\u3092\u7d42\u4e86\u3059\u308b\u305f\u3081\u3001\u76f8\u624b\u306e\u53d7\u4fe1\u30c8\u30ec\u30a4\u306b\u30e1\u30fc\u30eb\u304c\u5c4a\u304f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-0\">\u5177\u4f53\u7684\u306a\u30c1\u30a7\u30c3\u30af\u9805\u76ee<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5f62\u5f0f\u30c1\u30a7\u30c3\u30af\uff08\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\uff09@\u30de\u30fc\u30af\u306e\u4f4d\u7f6e\u3001\u30c9\u30e1\u30a4\u30f3\u540d\u3001\u4f7f\u7528\u7981\u6b62\u6587\u5b57\u306a\u3069\u3001\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3068\u3057\u3066\u57fa\u672c\u7684\u306a\u66f8\u5f0f\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30c9\u30e1\u30a4\u30f3\u306eMX\u30ec\u30b3\u30fc\u30c9\u30c1\u30a7\u30c3\u30af\u30c9\u30e1\u30a4\u30f3\uff08@\u4ee5\u964d\u306e\u90e8\u5206\uff09\u304c\u5b9f\u969b\u306b\u5b58\u5728\u3057\u3001\u30e1\u30fc\u30eb\u9001\u53d7\u4fe1\u306e\u305f\u3081\u306e\u300cMX\u30ec\u30b3\u30fc\u30c9\uff08\u90f5\u4fbf\u53d7\u3051\u306e\u4f4f\u6240\uff09\u300d\u3092\u6301\u3063\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u30e6\u30fc\u30b6\u30fc\u306e\u5b58\u5728\u78ba\u8a8d\uff08SMTP\u901a\u4fe1\uff09\u76f8\u624b\u5148\u306e\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306b\u300c\u3053\u306e\u5b9b\u5148\u306f\u4f7f\u3048\u307e\u3059\u304b\uff1f\u300d\u3068\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3044\u307e\u3059\u3002\u30e1\u30fc\u30eb\u672c\u6587\u3092\u9001\u308b\u76f4\u524d\uff08RCPT TO\u30b3\u30de\u30f3\u30c9\u5f8c\uff09\u306b\u901a\u4fe1\u3092\u5207\u65ad\u3059\u308b\u305f\u3081\u3001\u30e1\u30fc\u30eb\u306f\u9001\u3089\u305a\u306b\u5b58\u5728\u78ba\u8a8d\u306e\u307f\u3092\u884c\u3044\u307e\u3059\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u30c1\u30a7\u30c3\u30af\u7d50\u679c\u306f\u300c\u5b58\u5728\u3059\u308b\uff08\u6709\u52b9\uff09\u300d\u300c\u5b58\u5728\u3057\u306a\u3044\uff08\u7121\u52b9\uff09\u300d\u300c\u30c1\u30a7\u30c3\u30af\u4e0d\u53ef\uff08\u30a8\u30e9\u30fc\uff09\u300d\u306e3\u3064\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3067\u5206\u304b\u308a\u3084\u3059\u304f\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u8907\u6570\u30a2\u30c9\u30ec\u30b9\u306e\u4e00\u62ec\u30c1\u30a7\u30c3\u30af\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u3001\u7d50\u679c\u306fTSV\u5f62\u5f0f\u3067\u7c21\u5358\u306b\u30b3\u30d4\u30fc\u30fb\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">\u3053\u306e\u30c4\u30fc\u30eb\u3067\u53d6\u5f97\u3059\u308b\u60c5\u5831\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<p>\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u300c\u5b58\u5728\u78ba\u8a8d\uff08\u751f\u5b58\u78ba\u8a8d\uff09\u300d\u306f\u3001SMTP\uff08Simple Mail Transfer Protocol\uff09\u3068\u3044\u3046\u30e1\u30fc\u30eb\u9001\u4fe1\u306b\u4f7f\u308f\u308c\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u5fdc\u7b54\u3092\u5229\u7528\u3057\u3066\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u7d50\u679c\u30b9\u30c6\u30fc\u30bf\u30b9\u306e\u610f\u5473\u3068\u8a73\u7d30<\/h3>\n\n\n<div id=\"id-dfae73af-058d-4c64-a9cb-059bb9962d5a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>\u7d50\u679c\u30b9\u30c6\u30fc\u30bf\u30b9<\/strong><\/td><td><strong>\u610f\u5473<\/strong><\/td><td><strong>\u8a73\u7d30\uff08\u7406\u7531\uff09\u306e\u4f8b<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>\u5b58\u5728\u3059\u308b<\/strong><br>&lt;small&gt;\uff08Valid\uff09&lt;\/small&gt;<\/td><td><strong>\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u300c\u6709\u52b9\u306a\u30a2\u30ab\u30a6\u30f3\u30c8\u3067\u3042\u308b\u300d\u3068\u3044\u3046\u5fdc\u7b54\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/strong><br>\u30e1\u30fc\u30eb\u9001\u4fe1\u304c\u6210\u529f\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u72b6\u614b\u3067\u3059\u3002<br>\u203b\u30ad\u30e3\u30c3\u30c1\u30aa\u30fc\u30eb\u8a2d\u5b9a\uff08\u5168\u3066\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u53d7\u3051\u5165\u308c\u308b\u8a2d\u5b9a\uff09\u306e\u5834\u5408\u3001\u5b9f\u969b\u306b\u306f\u4e0d\u5728\u3067\u3082\u3053\u306e\u7d50\u679c\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/td><td>\u30fb\u6709\u52b9\u306a\u5f62\u5f0f\u304b\u3064\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u53d7\u4fe1\u3092\u8a31\u53ef\u3057\u305f\u3002<br>\u30fb\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u300c250 OK\u300d\u7b49\u306e\u6b63\u5e38\u5fdc\u7b54\u304c\u3042\u3063\u305f\u3002<\/td><\/tr><tr><td><strong>\u5b58\u5728\u3057\u306a\u3044<\/strong><br>&lt;small&gt;\uff08Invalid\uff09&lt;\/small&gt;<\/td><td><strong>\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u660e\u78ba\u306b\u300c\u3053\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u306f\u5b58\u5728\u3057\u306a\u3044\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u5fdc\u7b54\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/strong><br>\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u3078\u9001\u4fe1\u3057\u3066\u3082\u5c4a\u304d\u307e\u305b\u3093\u3002<\/td><td>\u30fb\u30e6\u30fc\u30b6\u30fc\u304c\u898b\u3064\u304b\u3089\u306a\u3044\uff08\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\uff1a550 User unknown\uff09\u3002<br>\u30fb\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u6e80\u676f\uff08\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\uff1a552\uff09\u3002<br>\u30fb\u30c9\u30e1\u30a4\u30f3\u304c\u5b58\u5728\u3057\u306a\u3044\u3002<\/td><\/tr><tr><td><strong>\u30c1\u30a7\u30c3\u30af\u4e0d\u53ef<\/strong><br>&lt;small&gt;\uff08Error\uff09&lt;\/small&gt;<\/td><td><strong>\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u5fdc\u7b54\u304c\u306a\u3044\u3001\u307e\u305f\u306f\u901a\u4fe1\u30a8\u30e9\u30fc\u306b\u3088\u308a\u78ba\u8a8d\u304c\u5b8c\u4e86\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/strong><br>\u3053\u306e\u30c4\u30fc\u30eb\u3067\u306f\u5224\u5b9a\u3067\u304d\u306a\u3044\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002<\/td><td>\u30fb\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\uff08\u5fdc\u7b54\u306a\u3057\uff09\u3002<br>\u30fb\u63a5\u7d9a\u62d2\u5426\uff08Connection 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