{"id":36178,"date":"2026-09-18T17:31:45","date_gmt":"2026-09-18T09:31:45","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/check-ptr-records-before-hong-kong-mail-server-migration\/"},"modified":"2026-09-18T17:35:00","modified_gmt":"2026-09-18T09:35:00","slug":"check-ptr-records-before-hong-kong-mail-server-migration","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/check-ptr-records-before-hong-kong-mail-server-migration\/","title":{"rendered":"\u9999\u6e2f\u90f5\u4ef6\u4f3a\u670d\u5668\u9077\u79fb\u524d\u7684 PTR \u8a18\u9304\u6aa2\u67e5"},"content":{"rendered":"<p>\n    \u5728\u4f60\u628a\u751f\u7522\u74b0\u5883\u90f5\u4ef6\u7cfb\u7d71\u5207\u63db\u5230\u65b0\u7684\u9999\u6e2f\u7bc0\u9ede\u4e4b\u524d\uff0c\u61c9\u8a72\u628a\u53cd\u5411 DNS \u7576\u4f5c\u9077\u79fb\u6aa2\u67e5\u6e05\u55ae\u88e1\u7684\u786c\u6027\u95dc\u5361\uff1b\u5982\u679c <a target=\"_blank\" href=\"https:\/\/www.varidata.com\/zh-tw\/server\/hk\/cn2\/\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684 PTR \u8a18\u9304\u8a2d\u5b9a\u932f\u8aa4\u6216\u4e7e\u8106\u7f3a\u5931\uff0c\u4f60\u5e7e\u4e4e\u662f\u5728\u7d66\u7070\u540d\u55ae\u3001\u5783\u573e\u4fe1\u5323\u6295\u905e\u548c\u96b1\u6027\u6536\u5165\u6d41\u5931\u63d0\u4f9b\u300c\u6a19\u6e96\u6559\u5b78\u300d\u5f0f\u7684\u5834\u666f\u3002\n  <\/p>\n<h2><strong>\u5728\u300c\u9ad8\u7d1a\u904e\u6ffe\u5668\u300d\u6642\u4ee3\uff0c\u70ba\u4ec0\u9ebc\u53cd\u5411 DNS \u4f9d\u7136\u95dc\u9375<\/strong><\/h2>\n<p>\n    \u73fe\u4ee3\u53cd\u5783\u573e\u5f15\u64ce\u6703\u904b\u884c\u8c9d\u6c0f\u6a21\u578b\u3001\u8a0a\u606f\u6307\u7d0b\u3001URL \u4fe1\u8b7d\uff0c\u751a\u81f3\u5167\u5bb9\u5c64\u7d1a\u7684\u6a5f\u5668\u5b78\u7fd2\uff0c\u4f46\u5728\u771f\u6b63\u958b\u59cb\u6c7a\u7b56\u524d\uff0c\u5f80\u5f80\u4ecd\u7136\u6703\u5148\u505a\u5e7e\u6b65\u975e\u5e38\u539f\u59cb\u7684\u5e03\u6797\u5224\u65b7\uff1a\u9019\u500b IP \u662f\u5426\u6709\u53cd\u5411 DNS\uff1f\u9019\u500b\u540d\u7a31\u770b\u8d77\u4f86\u662f\u5426\u50cf\u4e00\u500b\u6b63\u5e38\u7684\u90f5\u4ef6\u4e3b\u6a5f\uff1f\u5982\u679c\u4f60\u628a\u90f5\u4ef6\u7cfb\u7d71\u9077\u79fb\u5230\u4e00\u500b\u5168\u65b0\u7684\u9999\u6e2f IP \u5340\u6bb5\uff0c\u537b\u8df3\u904e\u4e86 PTR \u6821\u9a57\uff0c\u90a3\u9ebc\u5728\u5167\u5bb9\u904e\u6ffe\u5668\u9084\u6c92\u958b\u59cb\u5de5\u4f5c\u4e4b\u524d\uff0c\u9019\u4e9b\u65e9\u671f\u6aa2\u67e5\u5c31\u5df2\u7d93\u5927\u91cf\u5931\u6557\u4e86\u3002\n  <\/p>\n<ul>\n<li>PTR \u662f\u8b49\u660e\u300c\u9019\u500b IP \u4e0d\u662f\u96a8\u6a5f\u5bb6\u7528\u5bec\u983b\u7d42\u7aef\u300d\u7684\u7b2c\u4e00\u9053\u63e1\u624b\u8a0a\u865f\u3002<\/li>\n<li>\u9999\u6e2f\u4f4d\u5740\u5340\u6bb5\u627f\u8f09\u4e86\u5927\u91cf\u8de8\u5883\u6d41\u91cf\uff0c\u56e0\u6b64\u6703\u88ab\u66f4\u7a4d\u6975\u5730\u5be9\u67e5\u3002<\/li>\n<li>\u8a2d\u5b9a\u932f\u8aa4\u7684\u53cd\u5411 DNS \u5e38\u5e38\u6703\u5728\u786c\u9000\u4fe1\u65e5\u8a8c\u4e2d\u4ee5\u300creverse DNS lookup failed\u300d\u4e4b\u985e\u7684\u63cf\u8ff0\u51fa\u73fe\u3002<\/li>\n<\/ul>\n<p>\n    \u6b63\u56e0\u70ba\u5982\u6b64\uff0cPTR \u6821\u9a57\u7d55\u4e0d\u662f\u88dd\u9ede\u9580\u9762\u7684 DNS \u5c0f\u8abf\u6574\uff0c\u800c\u662f\u4efb\u4f55\u76f4\u63a5\u5c0d\u516c\u7db2\u8aaa SMTP \u7684\u90f5\u4ef6\u7bc0\u9ede\u90fd\u9700\u8981\u6eff\u8db3\u7684\u7d50\u69cb\u6027\u7d04\u675f\u3002\n  <\/p>\n<h2><strong>\u5feb\u901f\u5165\u9580\uff1aPTR \u8207 A \u7684\u5dee\u7570\uff0c\u4ee5\u53ca MTA \u70ba\u4f55\u5728\u4e4e\u5b83<\/strong><\/h2>\n<p>\n    \u5728 DNS \u9019\u4e00\u5c64\uff0c\u4f60\u53ef\u4ee5\u628a A \u8a18\u9304\u548c PTR \u8996\u70ba\u93e1\u50cf\u64cd\u4f5c\u3002A \u8a18\u9304\u5ba3\u544a\u67d0\u500b\u4e3b\u6a5f\u540d\u7a31\u6620\u5c04\u5230\u4e00\u500b IP \u4f4d\u5740\u3002PTR \u8a18\u9304\u5247\u8a17\u7ba1\u5728 in-addr.arpa \u6216 ip6.arpa \u5340\u57df\uff0c\u544a\u8a34\u5168\u4e16\u754c\u300c\u9019\u500b IP \u53cd\u5411\u6620\u5c04\u5230\u4e86\u54ea\u500b\u4e3b\u6a5f\u540d\u7a31\u300d\u3002\u9019\u7a2e\u7c21\u55ae\u7684\u5c0d\u7a31\u95dc\u4fc2\u8b93\u63a5\u6536\u7aef MTA \u53ef\u4ee5\u4ea4\u53c9\u6821\u9a57\u8eab\u5206\uff1a\u5b83\u770b\u5230 TCP \u5c0d\u7aef IP\uff0c\u505a\u4e00\u6b21\u53cd\u5411\u67e5\u8a62\uff0c\u518d\u5c0d\u7d50\u679c\u4e3b\u6a5f\u540d\u7a31\u505a\u4e00\u6b21\u6b63\u5411\u67e5\u8a62\u3002\n  <\/p>\n<p>\n    \u4e00\u500b\u300c\u5065\u5eb7\u300d\u7684\u90f5\u4ef6\u7bc0\u9ede\u8a2d\u5b9a\uff0c\u5927\u81f4\u61c9\u8a72\u9577\u9019\u6a23\uff1a\n  <\/p>\n<ul>\n<li><code>mail1.example.com<\/code> \u64c1\u6709\u6307\u5411\u4f60\u9999\u6e2f IP \u7684 A \u6216 AAAA \u8a18\u9304\u3002<\/li>\n<li>\u540c\u4e00\u500b IP \u7684 PTR \u8a18\u9304\u6307\u56de <code>mail1.example.com<\/code>\u3002<\/li>\n<li>\u4f60\u7684 MTA \u5728 HELO \u6216 EHLO \u6642\u901a\u544a\u7684\u4e3b\u6a5f\u540d\u7a31\u8207\u6b64\u5b8c\u5168\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<p>\n    \u7576\u9019\u4e09\u9805\u540c\u6642\u5c0d\u9f4a\u6642\uff0c\u591a\u500b\u4fe1\u8b7d\u7cfb\u7d71\u7d66\u51fa\u7684\u4fe1\u4efb\u5206\u6578\u90fd\u6703\u66f4\u597d\uff0c\u5c24\u5176\u662f\u5c0d\u90a3\u4e9b\u525b\u5f9e\u5176\u4ed6\u7528\u9014\u4e2d\u56de\u6536\u3001\u7f3a\u4e4f\u6b77\u53f2\u9059\u6e2c\u8cc7\u6599\u7684\u65b0\u4f4d\u5740\u800c\u8a00\u66f4\u70ba\u91cd\u8981\u3002\n  <\/p>\n<h2><strong>\u70ba\u4ec0\u9ebc\u9999\u6e2f\u90f5\u4ef6\u7bc0\u9ede\u5c0d PTR \u54c1\u8cea\u66f4\u52a0\u654f\u611f<\/strong><\/h2>\n<p>\n    \u5982\u679c\u4f60\u5728\u6feb\u7528\u4f47\u5217\u88e1\u5f85\u904e\u4e00\u6bb5\u6642\u9593\uff0c\u5f88\u53ef\u80fd\u6703\u6ce8\u610f\u5230\uff1a\u90e8\u5206\u9999\u6e2f\u7db2\u6bb5\u627f\u8f09\u7684\u696d\u52d9\u8ca0\u8f09\u5341\u5206\u6df7\u96dc\u2014\u2014\u65e2\u6709\u6b63\u898f\u4f01\u696d\u90f5\u4ef6\u3001\u6fc0\u9032\u884c\u92b7\u5e73\u53f0\uff0c\u53c8\u6709\u52a0\u5bc6\u8ca8\u5e63\u7db2\u7ad9\u3001\u904a\u6232\u6d41\u91cf\uff0c\u751a\u81f3\u5076\u723e\u593e\u96dc\u8457\u6bad\u5c4d\u7db2\u8def\u6b98\u7559\u3002\u9019\u7a2e\u6df7\u5408\u8ca0\u8f09\u6703\u8b93\u5927\u5ee0\u5728\u4fe1\u4efb\u65b0 IP \u6642\u8b8a\u5f97\u683c\u5916\u4fdd\u5b88\u3002\n  <\/p>\n<ol>\n<li>\n      <strong>\u4fe1\u8b7d\u57fa\u7dda\u4e0d\u7a69\u5b9a\u3002<\/strong> \u53bb\u5e74\u9084\u4e7e\u6de8\u7684\u4f4d\u5740\u5340\u6bb5\uff0c\u53ef\u80fd\u4eca\u5e74\u5df2\u7d93\u90e8\u5206\u88ab\u5217\u5165\u9ed1\u540d\u55ae\uff0c\u65b0 IP \u8d77\u6b65\u7684\u56fa\u6709\u4fe1\u4efb\u5ea6\u6703\u660e\u986f\u504f\u4f4e\u3002\n    <\/li>\n<li>\n      <strong>\u8de8\u5340\u8def\u7531\u96dc\u8a0a\u5927\u3002<\/strong> \u7576\u90f5\u4ef6\u8de8\u8d8a\u591a\u500b\u81ea\u6cbb\u7cfb\u7d71\u548c\u5340\u57df\u6642\uff0c\u4efb\u4f55\u300c\u7121\u53cd\u5411 DNS\u300d\u4e4b\u985e\u7684\u5f31\u8a0a\u865f\uff0c\u90fd\u8db3\u4ee5\u89f8\u767c\u7bc0\u6d41\u6216\u9650\u901f\u3002\n    <\/li>\n<li>\n      <strong>\u5171\u4eab\u57fa\u790e\u8a2d\u65bd\u5e38\u898b\u3002<\/strong> \u8a31\u591a\u5718\u968a\u70ba\u4e86\u5728\u4e9e\u6d32\u53d6\u5f97\u66f4\u597d\u7684\u5ef6\u9072\u8868\u73fe\uff0c\u6703\u642c\u5165\u9999\u6e2f\u6a5f\u623f\uff0c\u9078\u64c7\u9ad8\u5bc6\u5ea6\u865b\u64ec\u5316\u6216\u5171\u4eab\u578b\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\uff0c\u800c\u975e\u55ae\u79df\u6236\u7684\u88f8\u91d1\u5c6c\u4e3b\u6a5f\uff0c\u9019\u6703\u653e\u5927\u300c\u5435\u9b27\u9130\u5c45\u300d\u7684\u5916\u6ea2\u6548\u61c9\u3002\n    <\/li>\n<\/ol>\n<p>\n    \u5728\u9019\u7a2e\u80cc\u666f\u4e0b\uff0c\u300c\u4e7e\u6de8\u7684 PTR \u8a18\u9304\u300d\u5c6c\u65bc\u4f60\u6700\u5bb9\u6613\u638c\u63a7\u7684\u4f4e\u6210\u672c\u8a0a\u865f\u4e4b\u4e00\uff0c\u80fd\u6301\u7e8c\u5730\u628a\u98a8\u96aa\u8a55\u5206\u5f80\u4e0b\u58d3\uff0c\u8b93\u9060\u7aef\u904e\u6ffe\u5668\u5728\u6c7a\u5b9a\u662f\u6392\u968a\u3001\u6162\u8d70\u9084\u662f\u76f4\u63a5\u4e1f\u68c4\u4f60\u7684\u6d41\u91cf\u6642\uff0c\u66f4\u50be\u5411\u65bc\u6eab\u548c\u7684\u9078\u9805\u3002\n  <\/p>\n<h2><strong>\u8b58\u5225\u54ea\u4e9b IP \u771f\u7684\u9700\u8981\u505a PTR \u6aa2\u67e5<\/strong><\/h2>\n<p>\n    \u5728\u6e2c\u8a66\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u4e00\u4efd\u6e05\u55ae\uff0c\u5217\u51fa\u9077\u79fb\u5f8c\u53ef\u80fd\u767c\u51fa\u90f5\u4ef6\u7684\u6240\u6709 IP \u4f4d\u5740\u3002\u807d\u8d77\u4f86\u5f88\u7c21\u55ae\uff0c\u4f46\u5728\u5206\u6563\u5f0f\u90e8\u7f72\u4e2d\uff0c\u5f88\u5bb9\u6613\u6f0f\u6389\u67d0\u500b\u7bc0\u9ede\uff0c\u7d50\u679c\u65e5\u5f8c\u624d\u767c\u73fe\u67d0\u689d\u8def\u5f91\u4ecd\u7136\u8d70\u7684\u662f\u4e00\u500b\u53cd\u5411 DNS \u5df2\u7d93\u58de\u6389\u7684\u820a\u7aef\u9ede\u3002\n  <\/p>\n<ol>\n<li>\n      \u5217\u51fa\u6240\u6709\u51fa\u7ad9 SMTP \u4e2d\u7e7c\u7684\u516c\u7db2 IP\u3002\u5305\u542b\u900f\u904e NAT \u9598\u9053\u8f49\u767c\u7684\u5167\u90e8\u4e2d\u7e7c\uff1b\u771f\u6b63\u91cd\u8981\u7684\u662f\u6700\u7d42\u5c0d\u5916\u66b4\u9732\u7684\u51fa\u53e3 IP\u3002\n    <\/li>\n<li>\n      \u628a\u90a3\u4e9b\u76f4\u63a5\u9023\u516c\u7db2\u767c\u4fe1\u3001\u672a\u8d70\u4e2d\u5fc3\u4e2d\u7e7c\u53e2\u96c6\u7684\u61c9\u7528\u4f3a\u670d\u5668\u4e5f\u7d0d\u5165\u8003\u91cf\u3002\n    <\/li>\n<li>\n      \u6ce8\u610f\u8ca0\u8f09\u5e73\u8861\u5668\u3001\u9632\u706b\u7246\u8207\u90f5\u4ef6\u9598\u9053\uff0c\u53ea\u8981\u5b83\u5011\u53ef\u80fd\u767c\u8d77\u6216\u6539\u5beb\u9023\u7dda\uff0c\u4e26\u5728\u5c0d\u7aef\u770b\u4f86\u6210\u70ba\u300c\u4f86\u6e90 IP\u300d\uff0c\u5c31\u5fc5\u9808\u7d0d\u5165\u6aa2\u67e5\u6e05\u55ae\u3002\n    <\/li>\n<\/ol>\n<p>\n    \u4e00\u500b\u5be6\u7528\u4f46\u8db3\u5920\u7c21\u55ae\u7684\u65b9\u6cd5\uff0c\u662f\u5728\u6bcf\u53f0\u8207\u90f5\u4ef6\u76f8\u95dc\u7684\u7bc0\u9ede\u4e0a\u90e8\u7f72\u4e00\u500b\u5c0f\u8173\u672c\uff0c\u8a18\u9304\u5b83\u5728\u767c\u8d77\u51fa\u7ad9 TCP \u9023\u7dda\u6642\u770b\u5230\u7684\u516c\u7db2\u51fa\u53e3\u4f4d\u5740\uff0c\u7136\u5f8c\u628a\u6240\u6709\u65e5\u8a8c\u5f59\u7e3d\u6210\u4e00\u5f35\u5217\u8868\u3002\u9019\u4efd\u5217\u8868\u5c31\u53ef\u4ee5\u7576\u4f5c\u4f60\u6aa2\u67e5\u548c\u6700\u7d42\u6821\u9a57\u7684\u300c\u6b0a\u5a01 IP \u96c6\u5408\u300d\u3002\n  <\/p>\n<h2><strong>\u7528\u547d\u4ee4\u5217\u6aa2\u67e5 PTR \u8a18\u9304\u7684\u5e7e\u7a2e\u65b9\u5f0f<\/strong><\/h2>\n<p>\n    \u591a\u6578\u7dad\u8b77\u9999\u6e2f\u57fa\u790e\u8a2d\u65bd\u7684\u5de5\u7a0b\u5e2b\u624b\u88e1\uff0c\u90fd\u6709\u4e00\u5957\u985e Unix \u5de5\u5177\u7bb1\u3002\u9a57\u8b49\u53cd\u5411 DNS \u7684\u6700\u5feb\u65b9\u5f0f\uff0c\u5c31\u662f\u4f7f\u7528\u9019\u4e9b\u76f4\u63a5\u8207\u672c\u5730\u89e3\u6790\u5668\u6216\u6307\u5b9a\u905e\u8ff4 DNS \u4e92\u52d5\u7684\u6a19\u6e96\u67e5\u8a62\u5de5\u5177\u3002\n  <\/p>\n<h3>\u4f7f\u7528 <code>nslookup<\/code><\/h3>\n<p>\n    \u5728\u5e7e\u4e4e\u4efb\u4f55\u6709 Shell \u7684\u5e73\u81fa\u4e0a\uff0c\u4f60\u90fd\u53ef\u4ee5\u5148\u57f7\u884c\u985e\u4f3c\u5982\u4e0b\u7684\u6307\u4ee4\uff1a\n  <\/p>\n<pre><code>nslookup 203.0.113.45\r\nnslookup -type=PTR 203.0.113.45<\/code><\/pre>\n<p>\n    \u4f60\u8981\u627e\u7684\u662f\u985e\u4f3c\u300cname = \u2026\u300d\u7684\u90a3\u4e00\u884c\u3002\u9019\u500b\u6b04\u4f4d\u5c31\u662f\u8a72 IP \u5411\u7db2\u969b\u7db2\u8def\u5c55\u793a\u7684\u5019\u9078\u4e3b\u6a5f\u540d\u7a31\u3002\u5982\u679c\u4f60\u770b\u5230\u7684\u6a21\u5f0f\u985e\u4f3c <code>203-0-113-45.static.provider.net<\/code>\uff0c\u90a3\u9ebc\u5f88\u5927\u6a5f\u7387\u7528\u7684\u9084\u662f\u670d\u52d9\u5546\u7684\u9810\u8a2d\u53cd\u5411 DNS\uff0c\u800c\u4e0d\u662f\u4f60\u9810\u671f\u7684\u6a19\u6e96\u90f5\u4ef6\u4e3b\u6a5f\u540d\u7a31\u3002\n  <\/p>\n<h3>\u4f7f\u7528 <code>dig -x<\/code> \u53d6\u5f97\u66f4\u8a73\u7d30\u7684\u8cc7\u8a0a<\/h3>\n<p>\n    \u7576\u4f60\u5e0c\u671b\u5f97\u5230\u7cbe\u7c21\u3001\u4fbf\u65bc\u7a0b\u5f0f\u89e3\u6790\u7684\u8f38\u51fa\u6642\uff0c<code>dig<\/code> \u5f80\u5f80\u66f4\u5408\u9069\uff1a\n  <\/p>\n<pre><code>dig -x 203.0.113.45 +short\r\ndig -x 203.0.113.45<\/code><\/pre>\n<p>\n    \u52a0\u4e0a <code>+short<\/code> \u7684\u7248\u672c\u53ea\u6703\u5217\u5370\u89e3\u6790\u51fa\u4f86\u7684\u4e3b\u6a5f\u540d\u7a31\uff08\u5982\u679c\u5b58\u5728\u7684\u8a71\uff09\u3002\u5b8c\u6574\u7248\u5247\u5141\u8a31\u4f60\u6aa2\u67e5 TTL\u3001\u6388\u6b0a\u5340\u57df\u4ee5\u53ca\u9019\u662f\u5426\u70ba\u5feb\u53d6\u547d\u4e2d\u3002\u5982\u679c\u67e5\u8a62\u7d50\u679c\u70ba\u7a7a\uff0c\u5c0d\u9060\u7aef\u5783\u573e\u90f5\u4ef6\u904e\u6ffe\u5668\u4f86\u8aaa\uff0c\u4f60\u7684 PTR \u7b49\u540c\u65bc\u4e0d\u5b58\u5728\u3002\n  <\/p>\n<h3>\u6e2c\u8a66 IPv6 \u7684\u53cd\u5411\u89e3\u6790<\/h3>\n<p>\n    \u5982\u679c\u4f60\u5920\u5927\u81bd\uff0c\u628a\u751f\u7522\u90f5\u4ef6\u8dd1\u5728 IPv6 \u4e0a\uff0c\u540c\u6a23\u53ef\u4ee5\u4f7f\u7528\u4e0a\u8ff0\u6280\u8853\uff1b\u5dee\u7570\u50c5\u5728\u65bc\u66f4\u8907\u96dc\u7684\u53cd\u5411\u5340\u57df\u547d\u540d\u65b9\u5f0f\u3002\u5c0d\u65bc\u67d0\u500b IPv6 \u4f4d\u5740\uff0c<code>dig -x<\/code> \u6703\u5728\u5167\u90e8\u628a\u5404\u500b nibble \u91cd\u5beb\u9032 ip6.arpa \u7db2\u57df\u3002\u5f9e\u4f60\u7684\u8996\u89d2\u770b\uff0c\u4ecd\u7136\u53ea\u662f\u57f7\u884c\u4e00\u689d\u6307\u4ee4\uff0c\u7136\u5f8c\u67e5\u770b\u8fd4\u56de\u7684\u4e3b\u6a5f\u540d\u7a31\u3002\n  <\/p>\n<h2><strong>\u900f\u904e\u700f\u89bd\u5668\u5de5\u5177\u505a\u5feb\u901f\u8996\u89ba\u5316\u6aa2\u67e5<\/strong><\/h2>\n<p>\n    \u4f60\u7684\u5718\u968a\u88e1\u4e26\u4e0d\u662f\u6bcf\u500b\u4eba\u90fd\u6574\u5929\u6ce1\u5728\u7d42\u7aef\u6a5f\u88e1\u3002\u5728\u628a\u9077\u79fb Runbook \u4ea4\u7d66\u76f8\u95dc\u65b9\u6642\uff0c\u9644\u4e0a\u4e00\u4e9b\u700f\u89bd\u5668\u5f0f\u7684\u53cd\u5411 DNS \u8a3a\u65b7\u5de5\u5177\u5f80\u5f80\u6703\u66f4\u53cb\u5584\u3002\u8a31\u591a\u516c\u5171\u7ad9\u53f0\u652f\u63f4\u8f38\u5165\u4e00\u500b IP\uff0c\u7136\u5f8c\u4ee5\u5361\u7247\u5f62\u5f0f\u5c55\u793a PTR\u3001ASN\u3001\u5730\u7406\u4f4d\u7f6e\u4ee5\u53ca\u5176\u4ed6\u76f8\u95dc\u8cc7\u8a0a\u3002\n  <\/p>\n<ul>\n<li>\u628a\u898f\u756b\u4f5c\u70ba\u51fa\u7ad9\u7684\u6bcf\u500b IP \u81f3\u5c11\u5728\u5169\u500b\u7368\u7acb\u5de5\u5177\u4e2d\u6aa2\u67e5\u4e00\u6b21\uff0c\u4ee5\u907f\u514d\u88ab\u67d0\u500b\u89e3\u6790\u5668\u5feb\u53d6\u8aa4\u5c0e\u3002<\/li>\n<li>\u4ea4\u53c9\u6aa2\u67e5\u8a72\u4e3b\u6a5f\u540d\u7a31\u662f\u5426\u6e05\u695a\u5730\u8207\u54c1\u724c\u7db2\u57df\u76f8\u95dc\uff0c\u800c\u4e0d\u662f\u670d\u52d9\u5546\u901a\u7528\u4f4d\u5740\u6c60\u4e2d\u7684\u9810\u8a2d\u547d\u540d\u3002<\/li>\n<li>\u628a\u6aa2\u67e5\u7d50\u679c\u622a\u5716\uff0c\u4f5c\u70ba\u9077\u79fb\u8b8a\u66f4\u7d00\u9304\u6216\u5408\u898f\u7a3d\u6838\u7684\u8b49\u64da\u8cc7\u6599\u3002<\/li>\n<\/ul>\n<p>\n    \u7576\u4f60\u9700\u8981\u975e\u904b\u7dad\u540c\u4e8b\u5e6b\u5fd9\u78ba\u8a8d\u300c\u90f5\u4ef6\u4e3b\u6a5f\u540d\u7a31\u770b\u8d77\u4f86\u662f\u5426\u662f\u516c\u53f8\u54c1\u724c\u800c\u4e0d\u662f\u96a8\u6a5f\u5b57\u4e32\u300d\u6642\uff0c\u9019\u4e9b\u5de5\u5177\u5c24\u5176\u6709\u7528\uff0c\u5373\u4fbf\u4ed6\u5011\u5c0d DNS \u5167\u90e8\u5be6\u4f5c\u4e00\u7121\u6240\u77e5\u3002\n  <\/p>\n<h2><strong>\u50cf\u5783\u573e\u904e\u6ffe\u5668\u90a3\u6a23\u95b1\u8b80 PTR \u7d50\u679c<\/strong><\/h2>\n<p>\n    \u62ff\u5230 PTR \u503c\u4e4b\u5f8c\uff0c\u66f4\u5fae\u5999\u7684\u5de5\u4f5c\u662f\u5224\u65b7\uff1a\u5b83\u53ea\u662f\u300c\u5b58\u5728\u300d\uff0c\u9084\u662f\u300c\u54c1\u8cea\u8db3\u5920\u9ad8\u300d\u3002\u53cd\u5783\u573e\u7cfb\u7d71\u4e0d\u6703\u63e3\u6e2c\u4f60\u7684\u826f\u597d\u610f\u9858\uff1b\u5b83\u5011\u53ea\u6703\u5728\u9ad8\u901f\u6d41\u6c34\u7dda\u4e0a\u57f7\u884c\u4e00\u5957\u7c21\u55ae\u7684\u555f\u767c\u5f0f\u898f\u5247\u3002\u5617\u8a66\u7ad9\u5728\u5b83\u5011\u7684\u8996\u89d2\u601d\u8003\uff0c\u6703\u975e\u5e38\u6709\u50f9\u503c\u3002\n  <\/p>\n<ul>\n<li>\n      \u9019\u500b\u4e3b\u6a5f\u540d\u7a31\u662f\u5426\u660e\u986f\u770b\u8d77\u4f86\u662f\u57fa\u790e\u8a2d\u65bd\u7bc0\u9ede\uff0c\u4f8b\u5982 <code>mail1.brand.example<\/code>\uff0c\u800c\u4e0d\u662f\u50cf\u4e00\u53f0\u6d88\u8cbb\u7d1a\u88dd\u7f6e\uff1f\n    <\/li>\n<li>\n      \u5982\u679c\u4f60\u5c0d\u9019\u500b\u4e3b\u6a5f\u540d\u7a31\u505a\u4e00\u6b21\u6b63\u5411\u67e5\u8a62\uff0c\u7d50\u679c\u662f\u5426\u53c8\u89e3\u6790\u56de\u4f60\u6700\u521d\u7684\u90a3\u500b IP \u4f4d\u5740\uff1f\n    <\/li>\n<li>\n      \u4f60\u7684 MTA \u5728 SMTP \u554f\u5019\u968e\u6bb5\u662f\u5426\u5b8c\u6574\u800c\u7cbe\u78ba\u5730\u901a\u544a\u4e86\u9019\u500b\u540d\u7a31\uff0c\u6c92\u6709\u984d\u5916\u5225\u540d\u6216\u6a19\u7c64\u4e0d\u76f8\u7b26\u7684\u554f\u984c\uff1f\n    <\/li>\n<\/ul>\n<p>\n    \u7576\u4f60\u628a\u53cd\u5411 DNS\u3001\u6b63\u5411 DNS \u8207 HELO \u4e09\u8005\u5168\u90e8\u5c0d\u9f4a\u5f8c\uff0c\u53ef\u4ee5\u5728\u6975\u77ed\u6642\u9593\u5167\u6d88\u9664\u5927\u91cf\u300c\u8aa4\u5831\u5f0f\u7684\u53ef\u7591\u8a0a\u865f\u300d\uff0c\u5c24\u5176\u662f\u5c0d\u90a3\u4e9b\u525b\u5728\u9999\u6e2f\u6a5f\u623f\u958b\u901a\u3001\u5c1a\u672a\u5efa\u7acb\u7a69\u5b9a\u6295\u905e\u5074\u5beb\u7684\u65b0\u4f4d\u5740\u5340\u6bb5\u3002\n  <\/p>\n<h2><strong>\u8207\u670d\u52d9\u5546\u5354\u540c\uff1a\u8ab0\u771f\u6b63\u63a7\u5236\u4e86\u53cd\u5411 DNS<\/strong><\/h2>\n<p>\n    \u9077\u79fb\u904e\u7a0b\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u8aa4\u89e3\u662f\uff1a\u8ca0\u8cac\u7de8\u8f2f\u7db2\u57df\u6b63\u5411\u89e3\u6790\u7684\u7ba1\u7406\u54e1\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u6539 PTR\u3002\u73fe\u5be6\u662f\uff0c\u516c\u7db2 IPv4 \u548c IPv6 \u4f4d\u5740\u7684\u53cd\u5411 DNS \u7ba1\u7406\u6b0a\uff0c\u53d6\u6c7a\u65bc\u8ab0\u64c1\u6709\u9019\u6bb5\u4f4d\u5740\u7a7a\u9593\u3002\u5728\u9999\u6e2f\u8cc7\u6599\u4e2d\u5fc3\u74b0\u5883\u88e1\uff0c\u9019\u901a\u5e38\u610f\u5473\u8457\u662f\u4e0a\u6e38\u96fb\u4fe1\u696d\u8005\u3001\u6a5f\u623f\uff0c\u6216\u8005\u96f2\u5e73\u81fa\u8aaa\u4e86\u7b97\u3002\n  <\/p>\n<ol>\n<li>\n      \u5982\u679c\u4f60\u628a\u4f4d\u5740\u4f5c\u70ba\u66f4\u5927\u4e00\u652c\u5b50<strong>\u4f3a\u670d\u5668\u79df\u7528<\/strong>\u65b9\u6848\u7684\u4e00\u90e8\u5206\u79df\u7528\uff0c\u90a3\u9ebc\u53cd\u5411\u8a18\u9304\u901a\u5e38\u53ea\u80fd\u900f\u904e\u670d\u52d9\u5546\u63a7\u5236\u53f0\u6216\u5de5\u55ae\u6d41\u7a0b\u4f86\u4fee\u6539\u3002\n    <\/li>\n<li>\n      \u5982\u679c\u4f60\u6301\u6709\u81ea\u5df1\u7684\u8def\u7531\u524d\u7db4\uff0c\u4e26\u5728\u5340\u57df\u7db2\u969b\u7db2\u8def\u8a3b\u518a\u6a5f\u69cb\u5b8c\u6210\u4e86\u767b\u8a18\uff0c\u90a3\u9ebc\u5718\u968a\u53ef\u80fd\u5c31\u662f in-addr.arpa \u5340\u57df\u7684\u8a17\u7ba1\u65b9\uff0c\u53ef\u4ee5\u76f4\u63a5\u7de8\u8f2f PTR \u9805\u76ee\u3002\n    <\/li>\n<li>\n      \u5982\u679c\u90f5\u4ef6\u7bc0\u9ede\u90e8\u7f72\u5728\u7d14<strong>\u4f3a\u670d\u5668\u8a17\u7ba1<\/strong>\u6a5f\u6ac3\u4e2d\uff0c\u4e26\u900f\u904e\u591a\u5bb6\u96fb\u4fe1\u696d\u8005\u63a5\u5165\uff0c\u4f60\u9700\u8981\u78ba\u8a8d\u54ea\u4e00\u5bb6\u4e0a\u6e38\u5728\u5c0d\u5916\u5ee3\u64ad\u54ea\u500b\u4f4d\u5740\u5340\u6bb5\uff0c\u4ee5\u53ca\u8ab0\u6709\u6b0a\u9650\u70ba\u5c0d\u61c9\u7684\u4f4d\u5740\u5340\u584a\u5efa\u7acb\u53cd\u5411\u89e3\u6790\u8a18\u9304\u3002\n    <\/li>\n<\/ol>\n<p>\n    \u82e5\u60f3\u8b93\u9077\u79fb\u904e\u7a0b\u8db3\u5920\u9806\u66a2\uff0c\u61c9\u7576\u5728\u65e9\u671f\u898f\u5283\u968e\u6bb5\u5c31\u628a\u4e0a\u8ff0\u8abf\u67e5\u505a\u5b8c\uff0c\u800c\u4e0d\u662f\u5728\u5207\u63db\u7576\u5929\u624d\u767c\u73fe\uff1a\u6539\u4e00\u500b\u62fc\u5b57\u932f\u8aa4\u5c45\u7136\u9700\u8981\u63d0\u624b\u5de5\u5de5\u55ae\uff0c\u4e26\u4e14\u7b49\u5f85 24 \u5c0f\u6642\u7684\u670d\u52d9\u56de\u61c9\u6642\u9593\u3002\n  <\/p>\n<h2><strong>\u9999\u6e2f\u90f5\u4ef6\u9077\u79fb\u7684 PTR \u9a57\u8b49\u6d41\u7a0b\uff08\u5206\u6b65\u8aaa\u660e\uff09<\/strong><\/h2>\n<p>\n    \u70ba\u4e86\u5728\u4e0d\u540c\u74b0\u5883\u4e4b\u9593\u4fdd\u6301\u53ef\u91cd\u8907\u4f7f\u7528\u6027\uff0c\u4f60\u53ef\u4ee5\u628a\u6574\u500b\u6d41\u7a0b\u62bd\u8c61\u6210\u4e00\u500b\u5c0f\u800c\u78ba\u5b9a\u6027\u7684\u7ba1\u7dda\u3002\u76ee\u6a19\u662f\u5f9e\u300c\u6211\u5011\u89ba\u5f97 DNS \u6c92\u554f\u984c\u300d\u9019\u7a2e\u6a21\u7cca\u611f\u53d7\uff0c\u8f49\u8b8a\u70ba\u53ef\u9a57\u8b49\u3001\u53ef\u8a18\u9304\uff0c\u4e26\u64c1\u6709\u660e\u78ba\u901a\u904e\uff0f\u5931\u6557\u72c0\u614b\u7684\u64cd\u4f5c\u5e8f\u5217\u3002\n  <\/p>\n<ol>\n<li>\n      <strong>\u8490\u96c6\u8f38\u5165\u3002<\/strong> \u532f\u51fa\u6240\u6709\u53ef\u80fd\u4f5c\u70ba\u51fa\u7ad9 IP \u7684\u5217\u8868\uff0c\u4ee5\u53ca\u6bcf\u500b\u90f5\u4ef6\u7bc0\u9ede\u5c0d\u61c9\u7684\u76ee\u6a19\u6a19\u6e96\u4e3b\u6a5f\u540d\u7a31\u3002\n    <\/li>\n<li>\n      <strong>\u5feb\u7167\u76ee\u524d DNS \u72c0\u614b\u3002<\/strong> \u70ba\u6bcf\u500b\u4f4d\u5740\u8a18\u9304\u76ee\u524d PTR \u53ca\u5176 TTL\uff0c\u540c\u6642\u8a18\u4e0b\u76ee\u6a19\u4e3b\u6a5f\u540d\u7a31\u76ee\u524d\u7684 A \u6216 AAAA \u8a18\u9304\u3002\n    <\/li>\n<li>\n      <strong>\u63d0\u4ea4\u4fee\u6b63\u3002<\/strong> \u5c0d\u4efb\u4f55\u7f3a\u5931\u6216\u4e0d\u76f8\u7b26\u7684\u9805\u76ee\uff0c\u5411\u670d\u52d9\u5546\u63d0\u4ea4\u5de5\u55ae\u6216\u5728\u81ea\u6709\u53cd\u5411\u5340\u57df\u4e2d\u9032\u884c\u4fee\u6539\uff0c\u4e26\u70ba\u6bcf\u500b IP \u8a18\u9304\u5c0d\u61c9\u7684\u5de5\u55ae\u7de8\u865f\u3002\n    <\/li>\n<li>\n      <strong>\u9a57\u8b49\u751f\u6548\u60c5\u6cc1\u3002<\/strong> \u5728\u7b49\u5f85 TTL \u6642\u9577\u904e\u5f8c\uff0c\u5f9e\u81f3\u5c11\u5169\u500b\u7db2\u8def\uff08\u6700\u597d\u5305\u542b\u6a5f\u623f\u5916\u90e8\u7db2\u8def\uff09\u91cd\u65b0\u57f7\u884c <code>dig -x<\/code> \u67e5\u8a62\uff0c\u78ba\u8a8d\u7d50\u679c\u5df2\u7d93\u8207\u8a08\u756b\u4e00\u81f4\u3002\n    <\/li>\n<li>\n      <strong>\u9032\u884c\u771f\u5be6\u767c\u4fe1\u6e2c\u8a66\u3002<\/strong> \u5f9e\u6bcf\u500b\u65b0\u7bc0\u9ede\u5411\u4e3b\u6d41\u90f5\u4ef6\u670d\u52d9\u5546\u767c\u9001\u6e2c\u8a66\u90f5\u4ef6\uff0c\u6aa2\u67e5\u90f5\u4ef6\u6a19\u982d\u88e1\u8a18\u9304\u7684\u53cd\u5411\u540d\u7a31\u662f\u5426\u7b26\u5408\u9810\u671f\u3002\n    <\/li>\n<li>\n      <strong>\u8a18\u9304\u6700\u7d42\u72c0\u614b\u3002<\/strong> \u5728\u8b8a\u66f4\u7ba1\u7406\u7cfb\u7d71\u4e2d\u4fdd\u5b58\u300cIP \u2192 \u4e3b\u6a5f\u540d\u7a31\u300d\u7684\u6700\u7d42\u6620\u5c04\uff0c\u4ee5\u53ca\u9a57\u8b49\u65e5\u8a8c\uff0c\u4ee5\u5099\u65e5\u5f8c\u7a3d\u6838\u6216\u6545\u969c\u56de\u6eaf\u3002\n    <\/li>\n<\/ol>\n<p>\n    \u9019\u6a23\u4e00\u4efd\u7c21\u55ae\u7684\u6aa2\u67e5\u55ae\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u904b\u7dad\u610f\u5916\uff0c\u4e26\u70ba\u5f8c\u7e8c\u6240\u6709\u5728\u9999\u6e2f\u65b0\u589e\u90f5\u4ef6\u7bc0\u9ede\u2014\u2014\u7121\u8ad6\u662f\u5927\u91cf\u884c\u92b7\u90f5\u4ef6\u3001\u4ea4\u6613\u578b\u901a\u77e5\uff0c\u9084\u662f\u5076\u723e\u76f4\u63a5\u767c\u51fa\u8b66\u5831\u7684\u5fae\u670d\u52d9\u2014\u2014\u63d0\u4f9b\u53ef\u91cd\u8907\u4f7f\u7528\u7684\u6a19\u6e96\u7bc4\u672c\u3002\n  <\/p>\n<h2><strong>\u64f7\u53d6\u771f\u5be6 SMTP \u6703\u8a71\u4f86\u9a57\u8b49\u9810\u671f<\/strong><\/h2>\n<p>\n    \u53ea\u505a DNS \u6aa2\u67e5\u9084\u4e0d\u5920\uff0c\u771f\u6b63\u95dc\u9375\u7684\u662f\u9060\u7aef MTA \u5728\u9023\u7dda\u5efa\u7acb\u6642\u5230\u5e95\u770b\u5230\u4e86\u4ec0\u9ebc\u3002\u503c\u5f97\u82b1\u9ede\u6642\u9593\u5f9e\u65b0\u67b6\u69cb\u4e2d\u64f7\u53d6\u5e7e\u6bb5\u5b8c\u6574\u7684 SMTP \u6703\u8a71\uff0c\u628a\u5b83\u5011\u548c\u4f60\u5728\u8a2d\u8a08\u6587\u4ef6\u88e1\u756b\u904e\u7684\u7406\u8ad6\u6a21\u578b\u9032\u884c\u5c0d\u6bd4\u3002\n  <\/p>\n<ul>\n<li>\n      \u4f7f\u7528 <code>openssl s_client<\/code> \u6216\u539f\u59cb TCP \u7528\u6236\u7aef\uff0c\u9010\u884c\u89c0\u5bdf Banner \u548c EHLO \u4e92\u52d5\u904e\u7a0b\u3002\n    <\/li>\n<li>\n      \u78ba\u8a8d\u554f\u5019\u8a9e\u4e2d\u7684\u4e3b\u6a5f\u540d\u7a31\u8207 PTR \u8a18\u9304\u5b8c\u5168\u4e00\u81f4\uff0c\u5305\u542b\u6700\u5f8c\u4e00\u7d1a\u6a19\u7c64\u4ee5\u53ca\u7d50\u5c3e\u7684\u9ede\u865f\u7b49\u7d30\u7bc0\u8655\u7406\u3002\n    <\/li>\n<li>\n      \u6aa2\u67e5\u662f\u5426\u5b58\u5728\u90f5\u4ef6\u9598\u9053\u6216\u5b89\u5168\u8a2d\u5099\uff0c\u5728\u7b2c\u4e00\u8df3\u4e4b\u5f8c\u5077\u5077\u6539\u5beb\u4e86\u5c0d\u5916\u901a\u544a\u7684\u4e3b\u6a5f\u540d\u7a31\u3002\n    <\/li>\n<\/ul>\n<p>\n    \u7576\u767c\u73fe\u7570\u5e38\u6642\uff0c\u4f60\u5c31\u64c1\u6709\u8db3\u5920\u7684\u9059\u6e2c\u8cc7\u6599\uff0c\u53ef\u4ee5\u5224\u65b7\u554f\u984c\u7a76\u7adf\u51fa\u5728 MTA \u8a2d\u5b9a\u3001\u4ee3\u7406\u5c64\uff0c\u9084\u662f DNS \u8a18\u9304\u672c\u8eab\uff0c\u800c\u4e0d\u662f\u7e7c\u7e8c\u5c0d\u652f\u96e2\u7834\u788e\u7684\u9000\u4fe1\u8cc7\u8a0a\u505a\u300c\u7384\u5b78\u89e3\u8b80\u300d\u3002\n  <\/p>\n<h2><strong>\u628a PTR \u6aa2\u67e5\u7d0d\u5165\u90f5\u4ef6\u7cfb\u7d71\u7684\u6301\u7e8c\u4ea4\u4ed8\u6d41\u7a0b<\/strong><\/h2>\n<p>\n    \u983b\u7e41\u767c\u5e03\u90f5\u4ef6\u5806\u758a\u7684\u5718\u968a\uff0c\u5f80\u5f80\u7fd2\u6163\u628a DNS \u7576\u6210\u300c\u975c\u614b\u57fa\u790e\u8a2d\u65bd\u300d\uff0c\u800c\u5fd8\u4e86\u50cf\u6e2c\u8a66\u61c9\u7528\u7a0b\u5f0f\u78bc\u90a3\u6a23\u53bb\u6e2c\u8a66\u5b83\u3002\u4f60\u53ef\u4ee5\u900f\u904e\u5728\u90e8\u7f72\u6216\u4e0a\u7dda\u6d41\u7a0b\u4e2d\u5d4c\u5165\u4e00\u500b\u8f15\u91cf\u7d1a\u7684\u53cd\u5411 DNS \u7a3d\u6838\u6b65\u9a5f\uff0c\u4f86\u907f\u514d\u9019\u7a2e\u76f2\u9ede\u3002\n  <\/p>\n<ol>\n<li>\n      \u5728\u7ba1\u7dda\u4e2d\u65b0\u589e\u4e00\u500b\u4efb\u52d9\uff0c\u5c0d\u76ee\u524d\u7528\u65bc\u9810\u767c\u5e03\u8207\u751f\u7522\u74b0\u5883\u51fa\u7ad9\u6d41\u91cf\u7684\u6240\u6709\u51fa\u53e3\u4f4d\u5740\uff0c\u67e5\u8a62 PTR \u548c\u6b63\u5411\u89e3\u6790\u8a18\u9304\u3002\n    <\/li>\n<li>\n      \u5982\u679c\u4efb\u4e00\u67e5\u8a62\u70ba\u7a7a\u3001\u4e0d\u76f8\u7b26\uff0c\u6216\u8005\u89e3\u6790\u51fa\u7684\u4e3b\u6a5f\u540d\u7a31\u4e0d\u5728\u5141\u8a31\u7684\u6a21\u5f0f\u767d\u540d\u55ae\u4e2d\uff0c\u5247\u8b93\u7ba1\u7dda\u5931\u6557\u3002\n    <\/li>\n<li>\n      \u8f38\u51fa\u4e00\u4efd\u7c21\u660e\u7684 JSON \u5831\u544a\uff0c\u8207\u5efa\u7f6e\u7522\u7269\u4e00\u540c\u6b78\u6a94\uff0c\u65b9\u4fbf\u4e8b\u5f8c\u53d6\u8b49\u548c\u5408\u898f\u5be9\u6838\u3002\n    <\/li>\n<\/ol>\n<p>\n    \u5f9e\u9577\u671f\u4f86\u770b\uff0c\u9019\u500b\u5c0f\u5c0f\u7684\u81ea\u52d5\u5316\u6b65\u9a5f\u8db3\u4ee5\u9632\u6b62\u8a2d\u5b9a\u6f02\u79fb\uff0c\u5c24\u5176\u662f\u5728\u61c9\u7528\u8b8a\u66f4\u3001\u7db2\u8def\u8def\u7531\u3001DNS \u7ba1\u7406\u5206\u5225\u7531\u4e0d\u540c\u5718\u968a\u8ca0\u8cac\u7684\u9999\u6e2f\u53e2\u96c6\u74b0\u5883\u4e2d\u3002\n  <\/p>\n<h2><strong>\u5e38\u898b\u932f\u8aa4\u8a2d\u5b9a\u4ee5\u53ca\u5feb\u901f\u4fee\u5fa9\u601d\u8def<\/strong><\/h2>\n<p>\n    \u5373\u4fbf\u662f\u7d93\u9a57\u8c50\u5bcc\u7684\u904b\u7dad\uff0c\u4e5f\u6703\u5728\u90f5\u4ef6\u9077\u79fb\u904e\u7a0b\u4e2d\u8e29\u5230\u4e00\u7d44\u53cd\u8986\u51fa\u73fe\u7684\u5751\u3002\u63d0\u524d\u8b58\u5225\u5b83\u5011\uff0c\u53ef\u4ee5\u5728\u771f\u6b63\u5207\u63db\u7684\u6642\u9593\u7a97\u88e1\uff0c\u986f\u8457\u964d\u4f4e\u4f60\u7684\u5fc3\u7406\u58d3\u529b\u3002\n  <\/p>\n<ul>\n<li>\n      <strong>\u5b8c\u5168\u6c92\u6709 PTR\u3002<\/strong> \u73fe\u8c61\uff1a\u6240\u6709\u6e2c\u8a66\u67e5\u8a62\u90fd\u8fd4\u56de\u7a7a\u7d50\u679c\uff1b\u4fee\u5fa9\u65b9\u5f0f\uff1a\u8acb\u6c42\u5efa\u7acb\u6307\u5411\u6a19\u6e96\u90f5\u4ef6\u4e3b\u6a5f\u540d\u7a31\u7684 PTR\uff0c\u4e26\u5728 TTL \u904e\u5f8c\u505a\u9a57\u8b49\u3002\n    <\/li>\n<li>\n      <strong>\u53cd\u5411\u6307\u5411\u4e86\u932f\u8aa4\u6216\u5931\u6548\u7684\u4e3b\u6a5f\u540d\u7a31\u3002<\/strong> \u73fe\u8c61\uff1a\u4e3b\u6a5f\u540d\u7a31\u53ef\u4ee5\u89e3\u6790\uff0c\u4f46\u6b63\u5411\u67e5\u8a62\u843d\u5728\u5176\u4ed6 IP \u4e0a\uff1b\u4fee\u5fa9\u65b9\u5f0f\uff1a\u5c0d\u9f4a A \u6216 AAAA \u8a18\u9304\uff0c\u4f7f\u300cIP \u2192 \u4e3b\u6a5f\u540d\u7a31 \u2192 IP\u300d\u7684\u8ff4\u8def\u4fdd\u6301\u4e00\u81f4\u3002\n    <\/li>\n<li>\n      <strong>HELO \u5b57\u4e32\u4e0d\u4e00\u81f4\u3002<\/strong> \u73fe\u8c61\uff1aDNS \u770b\u8d77\u4f86\u6c92\u554f\u984c\uff0c\u4f46 SMTP \u6703\u8a71\u88e1\u5c55\u793a\u7684\u662f\u53e6\u5916\u4e00\u500b\u4e3b\u6a5f\u540d\u7a31\uff1b\u4fee\u5fa9\u65b9\u5f0f\uff1a\u8abf\u6574 MTA \u8a2d\u5b9a\uff0c\u8b93\u5176\u901a\u544a\u6a19\u6e96\u540d\u7a31\uff0c\u4e26\u5728\u4e0d\u4e1f\u9023\u7dda\u7684\u524d\u63d0\u4e0b\u5e73\u6ed1\u91cd\u8f09\u3002\n    <\/li>\n<li>\n      <strong>\u55ae\u4e00 IP \u5b58\u5728\u591a\u500b PTR \u8a18\u9304\u3002<\/strong> \u73fe\u8c61\uff1a\u8a3a\u65b7\u5de5\u5177\u986f\u793a\u4e86\u4e00\u6574\u4e32\u4e3b\u6a5f\u540d\u7a31\uff1b\u4fee\u5fa9\u65b9\u5f0f\uff1a\u6536\u6582\u70ba\u4e00\u500b\u4ee5\u90f5\u4ef6\u70ba\u4e3b\u7684\u552f\u4e00\u53cd\u5411\u9805\u76ee\uff0c\u907f\u514d\u6536\u4ef6\u65b9\u7522\u751f\u6b67\u7fa9\u3002\n    <\/li>\n<\/ul>\n<p>\n    \u5feb\u901f\u4fee\u5fa9\u4e0a\u8ff0\u554f\u984c\uff0c\u901a\u5e38\u8db3\u4ee5\u8b93\u4e00\u500b\u300c\u908a\u7de3\u53ef\u7591\u767c\u9001\u7aef\u300d\u56de\u5230\u8f03\u70ba\u4e2d\u6027\u7684\u57fa\u7dda\uff0c\u5c24\u5176\u662f\u5728\u4f60\u5df2\u7d93\u8a2d\u5b9a\u4e86\u5408\u7406 SPF \u548c\u7c3d\u540d\u6a5f\u5236\u7684\u524d\u63d0\u4e0b\u3002\n  <\/p>\n<h2><strong>\u7e3d\u7d50\uff1a\u628a PTR \u7576\u4f5c\u9077\u79fb\u7684\u7b2c\u4e00\u7d1a\u95dc\u5361<\/strong><\/h2>\n<p>\n    \u5982\u679c\u4f60\u53ea\u628a\u90f5\u4ef6\u9077\u79fb\u7576\u6210\u300c\u61c9\u7528\u642c\u5bb6\u300d\uff0c\u5f88\u5bb9\u6613\u628a DNS \u7576\u6210\u80cc\u666f\u6c34\u7ba1\u3002\u73fe\u5be6\u60c5\u6cc1\u662f\uff0c\u5c0d\u65bc\u9999\u6e2f\u9019\u6a23\u7684\u90e8\u7f72\u74b0\u5883\uff0c\u6b63\u78ba\u7684\u53cd\u5411\u89e3\u6790\u8207 TLS 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