{"id":32678,"date":"2026-05-21T15:19:12","date_gmt":"2026-05-21T07:19:12","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-cn\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/"},"modified":"2026-05-21T15:24:54","modified_gmt":"2026-05-21T07:24:54","slug":"how-isp-blocking-of-smtp-port-25-impacts-email-delivery","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-cn\/blog\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/","title":{"rendered":"ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u5bf9\u90ae\u4ef6\u6295\u9012\u7684\u5f71\u54cd"},"content":{"rendered":"<p>\u4f60\u53ef\u80fd\u4f1a\u53d1\u73b0\uff0c\u4ece\u5bb6\u5ead\u7f51\u7edc\u53d1\u9001\u90ae\u4ef6\u6709\u65f6\u4f1a\u5931\u8d25\u3002\u5927\u591a\u6570 ISP \u4f1a\u5c4f\u853d <a target=\"_blank\" href=\"https:\/\/www.varidata.com\/zh-cn\/blog\/fix-gmail-email-rejection-caused-by-dns-ptr-issues\/\">SMTP \u7aef\u53e3<\/a> 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\u7aef\u53e3\u80fd\u963b\u65ad\u5783\u573e\u90ae\u4ef6\uff0c\u4fdd\u62a4\u7f51\u7edc\u58f0\u8a89\u3002<\/p>\n<\/li>\n<li>\n<p>\u88ab\u653b\u9677\u7684\u5bb6\u5ead\u7f51\u7edc\u8fde\u63a5\u53ef\u80fd\u53d8\u6210\u5783\u573e\u90ae\u4ef6\u201c\u673a\u5668\u201d\uff0c\u5411\u4e92\u8054\u7f51\u6d2a\u6cdb\u5f0f\u5730\u53d1\u9001\u4e0d\u53d7\u6b22\u8fce\u7684\u90ae\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u8fd9\u4e00\u63aa\u65bd\u6709\u52a9\u4e8e ISP \u907f\u514d\u88ab\u5927\u578b\u90ae\u4ef6\u670d\u52a1\u5546\u5217\u5165\u9ed1\u540d\u5355\uff0c\u4ece\u800c\u8ba9\u4f60\u7684\u5408\u6cd5\u90ae\u4ef6\u66f4\u6709\u673a\u4f1a\u6210\u529f\u9001\u8fbe\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u914d\u5408\u5f3a\u5236 SMTP \u8eab\u4efd\u9a8c\u8bc1\u4e00\u8d77\u5c4f\u853d 25 \u7aef\u53e3\uff0c\u53ef\u4ee5\u66f4\u5bb9\u6613\u5730\u5b9a\u4f4d\u5e76\u963b\u65ad\u88ab\u611f\u67d3\u7684\u8bbe\u5907\u3002\u8fd9\u79cd\u7b56\u7565\u4f1a\u628a\u5783\u573e\u90ae\u4ef6\u6d41\u91cf\u96c6\u4e2d\u5230\u53ef\u76d1\u63a7\u7684\u670d\u52a1\u5668\u4e0a\uff0c\u4fbf\u4e8e\u5bf9\u5916\u53d1\u5783\u573e\u90ae\u4ef6\u8fdb\u884c\u68c0\u6d4b\u548c\u62e6\u622a\u3002\u5f88\u591a\u62a5\u544a\u663e\u793a\uff0c\u8fd9\u79cd\u505a\u6cd5\u53ef\u4ee5\u5728\u51e0\u4e4e\u6ca1\u6709\u7528\u6237\u6295\u8bc9\u6f0f\u4fe1\u7684\u524d\u63d0\u4e0b\uff0c\u5c06\u5783\u573e\u90ae\u4ef6\u6570\u91cf\u524a\u51cf 95% \u4ee5\u4e0a\u3002<\/p>\n<h3>\u4fdd\u62a4 ISP \u7684\u90ae\u4ef6\u4fe1\u8a89<\/h3>\n<p>\u4f60\u7684 ISP \u5fc5\u987b\u7ef4\u62a4\u81ea\u5df1\u7684\u90ae\u7bb1\u4fe1\u8a89\u5ea6\uff0c\u624d\u80fd\u4fdd\u8bc1\u4f60\u53d1\u9001\u7684\u90ae\u4ef6\u88ab\u6b63\u5e38\u63a5\u6536\u3002\u5982\u679c\u88ab\u611f\u67d3\u7684\u7535\u8111\u6301\u7eed\u5927\u89c4\u6a21\u53d1\u9001\u5783\u573e\u90ae\u4ef6\uff0cISP \u6240\u5728\u7684\u7f51\u7edc\u5c31\u6709\u53ef\u80fd\u88ab\u5217\u5165\u9ed1\u540d\u5355\u3002\u4e00\u65e6\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff0c\u5927\u578b\u90ae\u4ef6\u670d\u52a1\u63d0\u4f9b\u5546\u53ef\u80fd\u4f1a\u76f4\u63a5\u62d2\u6536\u6765\u81ea\u8be5\u7f51\u7edc\u7684\u6240\u6709\u90ae\u4ef6\uff0c\u5373\u4fbf\u4f60\u672c\u4eba\u5e76\u6ca1\u6709\u4efb\u4f55\u8fdd\u89c4\u884c\u4e3a\u3002<\/p>\n<p>\u901a\u8fc7\u5c4f\u853d 25 \u7aef\u53e3\uff0cISP \u80fd\u66f4\u597d\u5730\u63a7\u5236\u6765\u81ea\u88ab\u653b\u9677\u8bbe\u5907\u7684\u6076\u610f\u90ae\u4ef6\u6d41\u91cf\u3002\u5728\u8fd9\u4e9b\u90ae\u4ef6\u79bb\u5f00\u7f51\u7edc\u4e4b\u524d\u88ab\u963b\u65ad\uff0c\u6709\u52a9\u4e8e ISP \u4fdd\u6301\u826f\u597d\u7684\u4fe1\u8a89\uff0c\u907f\u514d\u88ab\u9ed1\u540d\u5355\u62e6\u622a\uff0c\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\uff0c\u4f60\u7684\u5408\u6cd5\u90ae\u4ef6\u66f4\u6709\u673a\u4f1a\u88ab\u987a\u5229\u9001\u8fbe\u3002<\/p>\n<h3>\u5bb6\u5ead\u7528\u6237\u4e0e\u4f01\u4e1a\u7528\u6237\u7684\u9650\u5236\u5dee\u5f02<\/h3>\n<p>\u5e76\u4e0d\u662f\u6240\u6709\u7528\u6237\u9762\u5bf9\u7684\u89c4\u5219\u90fd\u4e00\u6837\u3002\u5927\u591a\u6570\u5bb6\u5ead\u5bbd\u5e26\u7528\u6237\u7684 25 \u7aef\u53e3\u90fd\u4f1a\u88ab\u9ed8\u8ba4\u5c4f\u853d\uff0c\u4ee5\u9632\u5783\u573e\u90ae\u4ef6\u5e76\u63d0\u5347\u5b89\u5168\u6027\u3002\u5982\u679c\u4f60\u4f7f\u7528\u7684\u662f\u4f01\u4e1a\u7ebf\u8def\uff0c\u5219\u6709\u53ef\u80fd\u88ab\u5141\u8bb8\u8bbf\u95ee 25 \u7aef\u53e3\uff0c\u4f46\u901a\u5e38\u9700\u8981\u652f\u4ed8\u66f4\u9ad8\u7684\u8ba2\u9605\u8d39\u7528\u3002<\/p>\n<ul>\n<li>\n<p>\u5bb6\u5ead\u7528\u6237\u4e00\u822c\u4f1a\u56e0\u4e3a\u5b89\u5168\u539f\u56e0\u88ab\u5c4f\u853d 25 \u7aef\u53e3\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f01\u4e1a\u7528\u6237\u5728\u67d0\u4e9b\u5957\u9910\u4e2d\u53ef\u4ee5\u83b7\u5f97 25 \u7aef\u53e3\u8bbf\u95ee\u6743\u9650\uff0c\u4f46\u5f80\u5f80\u4ef7\u683c\u66f4\u9ad8\u3002<\/p>\n<\/li>\n<li>\n<p>\u6709\u4e9b\u7528\u6237\u4f1a\u8f6c\u800c\u9009\u62e9\u5141\u8bb8\u81ea\u5efa\u90ae\u4ef6\u670d\u52a1\u5668\u7684\u670d\u52a1\u63d0\u4f9b\u5546\uff0c\u8fd9\u5728\u4f01\u4e1a\u7ebf\u8def\u4e2d\u66f4\u4e3a\u5e38\u89c1\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5373\u4f7f\u5728\u62e5\u6709\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668\uff08VPS\uff09\u6216\u670d\u52a1\u5668\u6258\u7ba1\uff08colocation\uff09\u7684\u6570\u636e\u4e2d\u5fc3\u73af\u5883\u4e2d\uff0cISP \u4e5f\u53ef\u80fd\u9ed8\u8ba4\u5c4f\u853d 25 \u7aef\u53e3\u3002\u5bf9\u4e8e\u5bb6\u5ead\u5bbd\u5e26\u8d26\u6237\uff0c\u5165\u7ad9\u7684 25 \u7aef\u53e3\u88ab\u5c01\u7684\u60c5\u51b5\u66f4\u4e3a\u5e38\u89c1\u3002ISP \u5728\u5c4f\u853d 25 \u7aef\u53e3\u65f6\u8fd8\u5fc5\u987b\u9075\u5b88\u81ea\u5df1\u7684\u670d\u52a1\u6761\u6b3e\uff1a\u5728\u5bb6\u5ead\u7ebf\u8def\u4e0a\u8fd0\u884c\u670d\u52a1\u5668\u901a\u5e38\u662f\u4e0d\u88ab\u5141\u8bb8\u7684\uff0c\u5c1d\u8bd5\u7ed5\u8fc7\u5c01\u9501\u53ef\u80fd\u4f1a\u8fdd\u53cd\u4f60\u4e0e\u8fd0\u8425\u5546\u4e4b\u95f4\u7684\u534f\u8bae\u3002<\/p>\n<blockquote>\n<p>\u6ce8\u610f\uff1a\u5c4f\u853d 25 \u7aef\u53e3\u5e76\u4e0d\u4f1a\u963b\u6b62\u4f60\u901a\u8fc7\u5176\u4ed6\u7aef\u53e3\u4f7f\u7528\u5e26\u8eab\u4efd\u9a8c\u8bc1\u7684\u90ae\u4ef6\u53d1\u9001\u65b9\u5f0f\u3002\u4f60\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u5b89\u5168\u7684\u66ff\u4ee3\u65b9\u5f0f\u53d1\u9001\u90ae\u4ef6\u3002<\/p>\n<\/blockquote>\n<h2>ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u5bf9\u90ae\u4ef6\u670d\u52a1\u7684\u5f71\u54cd<\/h2>\n<h3>\u4ece\u5bb6\u5ead\u7f51\u7edc\u53d1\u9001\u90ae\u4ef6<\/h3>\n<p>\u5f53\u4f60\u5c1d\u8bd5\u4ece\u5bb6\u5ead\u7f51\u7edc\u53d1\u9001\u90ae\u4ef6\u65f6\uff0c\u53ef\u80fd\u4f1a\u53d1\u73b0\u90ae\u4ef6\u8fdf\u8fdf\u53d1\u4e0d\u51fa\u53bb\u6216\u6839\u672c\u65e0\u6cd5\u9001\u8fbe\u3002\u4e00\u65e6 ISP \u5c4f\u853d\u4e86 SMTP 25 \u7aef\u53e3\uff0c\u4f60\u7684\u90ae\u4ef6\u670d\u52a1\u5c31\u4f1a\u9047\u5230\u591a\u91cd\u969c\u788d\u3002\u5927\u90e8\u5206\u90ae\u4ef6\u5ba2\u6237\u7aef\u5c06\u65e0\u6cd5\u8fde\u63a5\u76ee\u6807\u90ae\u4ef6\u670d\u52a1\u5668\uff0c\u5bfc\u81f4\u90ae\u4ef6\u88ab\u5361\u5728\u53d1\u4ef6\u7bb1\uff0c\u4f60\u53ef\u80fd\u4f1a\u7ecf\u5386\u957f\u65f6\u95f4\u5ef6\u8fdf\uff0c\u751a\u81f3\u5f7b\u5e95\u53d1\u9001\u5931\u8d25\u3002\u81ea\u52a8\u5316\u90ae\u4ef6\uff08\u4f8b\u5982\u7528\u6237\u901a\u77e5\u3001\u8ba2\u5355\u786e\u8ba4\u7b49\uff09\u4e5f\u53ef\u80fd\u65e0\u6cd5\u6210\u529f\u9001\u8fbe\u3002\u8fd9\u4e9b\u95ee\u9898\u4f1a\u5e72\u6270\u4f60\u7684\u65e5\u5e38\u6c9f\u901a\uff0c\u751a\u81f3\u5bf9\u4e1a\u52a1\u8fd0\u8425\u9020\u6210\u5f71\u54cd\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5728\u5bb6\u91cc\u81ea\u5efa\u90ae\u4ef6\u670d\u52a1\u5668\uff0c\u5c31\u5fc5\u987b\u4f7f\u7528 587 \u7b49\u7aef\u53e3\u6765\u8fdb\u884c\u52a0\u5bc6\u901a\u4fe1\u300225 \u7aef\u53e3\u867d\u7136\u662f\u4f20\u7edf\u7684\u90ae\u4ef6\u670d\u52a1\u5668\u901a\u9053\uff0c\u4f46\u56e0\u4e3a\u5b58\u5728\u6ee5\u7528\u98ce\u9669\u4f1a\u88ab ISP \u5c4f\u853d\u3002\u5f88\u591a ISP \u7684\u4e00\u7ebf\u5458\u5de5\u5e76\u4e0d\u4e86\u89e3 25 \u7aef\u53e3\u7684\u7ec6\u8282\uff0c\u5e76\u4e14\u901a\u5e38\u4f1a\u575a\u6301\u8868\u793a\u5728\u5bb6\u5ead\u5bbd\u5e26\u4e0a\u65e0\u6cd5\u4e3a\u4f60\u89e3\u9664\u5c01\u9501\u3002<\/p>\n<p>\u65e0\u8bba\u662f\u4e2a\u4eba\u8fd8\u662f\u5de5\u4f5c\u573a\u666f\uff0c\u4f60\u90fd\u79bb\u4e0d\u5f00\u7a33\u5b9a\u53ef\u9760\u7684\u90ae\u4ef6\u670d\u52a1\u3002\u4e00\u65e6 25 \u7aef\u53e3\u88ab\u5c01\uff0c\u4f60\u5c31\u5fc5\u987b\u5bfb\u627e\u66ff\u4ee3\u65b9\u5f0f\u6765\u53d1\u9001\u90ae\u4ef6\uff0c\u6bd4\u5982\u6539\u7528\u5e26\u8eab\u4efd\u9a8c\u8bc1\u7684 SMTP \u670d\u52a1\uff0c\u6216\u5c06\u5ba2\u6237\u7aef\/\u5e94\u7528\u5207\u6362\u5230\u652f\u6301\u52a0\u5bc6\u7684\u7aef\u53e3\u3002<\/p>\n<h3>\u5e38\u89c1\u95ee\u9898\u4e0e\u9519\u8bef\u63d0\u793a<\/h3>\n<p>\u5f53 ISP \u5c4f\u853d 25 \u7aef\u53e3\u65f6\uff0c\u4f60\u53ef\u80fd\u4f1a\u9047\u5230\u5404\u79cd\u8fde\u63a5\u5931\u8d25\u548c\u6295\u9012\u5931\u8d25\u7684\u95ee\u9898\u3002\u90ae\u4ef6\u5ba2\u6237\u7aef\u65e0\u6cd5\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5\uff0c\u8fdb\u800c\u51fa\u73b0\u62a5\u9519\u3002\u5e38\u89c1\u95ee\u9898\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\n<p>\u90ae\u4ef6\u56e0\u7aef\u53e3\u88ab\u5c01\u9501\u800c\u65e0\u6cd5\u6b63\u5e38\u53d1\u9001\u6216\u63a5\u6536\u3002<\/p>\n<\/li>\n<li>\n<p>\u51fa\u73b0\u8fde\u63a5\u8d85\u65f6\uff08timeout\uff09\u6216\u8fde\u63a5\u88ab\u62d2\u7edd\uff08connection refused\uff09\u9519\u8bef\u3002<\/p>\n<\/li>\n<li>\n<p>\u90ae\u4ef6\u5e94\u7528\u65e0\u6cd5\u6210\u529f\u5efa\u7acb\u8fde\u63a5\u6765\u6295\u9012\u6d88\u606f\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u80fd\u770b\u5230\u7c7b\u4f3c\u4ee5\u4e0b\u9519\u8bef\u63d0\u793a\uff1a<\/p>\n<ul>\n<li>\n<p>SMTP ERROR: Failed to connect to server: Permission denied (13)<\/p>\n<\/li>\n<li>\n<p>Connection unexpectedly closed: timed out<\/p>\n<\/li>\n<li>\n<p>Timeout::Error (execution expired)<\/p>\n<\/li>\n<li>\n<p>SMTP ERROR: QUIT command failed: Connection: closed<\/p>\n<\/li>\n<li>\n<p>SMTP connect() failed.<\/p>\n<\/li>\n<li>\n<p>Mailer Error: SMTP connect() failed.<\/p>\n<\/li>\n<li>\n<p>SMTP -&gt; ERROR: Failed to connect to server: Connection timed out (110)<\/p>\n<\/li>\n<li>\n<p>SMTP Error: Could not connect to SMTP host.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u63d0\u793a\uff1a\u5982\u679c\u4f60\u9891\u7e41\u770b\u5230\u4e0a\u8ff0\u9519\u8bef\uff0c\u5f88\u53ef\u80fd\u662f ISP \u5c4f\u853d\u4e86 25 \u7aef\u53e3\u3002\u4f60\u53ef\u4ee5\u68c0\u67e5\u90ae\u4ef6\u5ba2\u6237\u7aef\u8bbe\u7f6e\uff0c\u6216\u8054\u7cfb\u670d\u52a1\u63d0\u4f9b\u5546\u786e\u8ba4\u3002<\/p>\n<\/blockquote>\n<p>\u8fd9\u4e9b\u95ee\u9898\u4f1a\u4e25\u91cd\u524a\u5f31\u90ae\u4ef6\u670d\u52a1\u7684\u53ef\u9760\u6027\uff0c\u4f60\u53ef\u80fd\u9519\u8fc7\u91cd\u8981\u4fe1\u606f\uff0c\u4e5f\u53ef\u80fd\u65e0\u6cd5\u5411\u5ba2\u6237\u53d1\u9001\u5173\u952e\u901a\u77e5\u3002\u7406\u89e3\u8fd9\u4e9b\u9519\u8bef\u7684\u6839\u6e90\uff0c\u6709\u52a9\u4e8e\u4f60\u66f4\u5feb\u627e\u5230\u89e3\u51b3\u65b9\u6848\uff0c\u5c3d\u5feb\u6062\u590d\u6b63\u5e38\u7684\u90ae\u4ef6\u6536\u53d1\u3002<\/p>\n<h3>\u5bf9\u81ea\u5efa\u90ae\u4ef6\u670d\u52a1\u7684\u5f71\u54cd<\/h3>\n<p>\u5982\u679c\u4f60\u81ea\u884c\u642d\u5efa\u90ae\u4ef6\u670d\u52a1\u5668\uff0c25 \u7aef\u53e3\u7684\u5c01\u9501\u4f1a\u5e26\u6765\u5de8\u5927\u6311\u6218\u3002SMTP \u6807\u51c6\u5c31\u662f\u5efa\u7acb\u5728 25 \u7aef\u53e3\u4e4b\u4e0a\u7684\uff0c\u5b83\u662f\u90ae\u4ef6\u53d1\u9001\u6240\u5fc5\u9700\u7684\u901a\u9053\u3002ISP \u5c4f\u853d\u8be5\u7aef\u53e3\uff0c\u662f\u4e3a\u4e86\u9632\u6b62\u6765\u81ea\u5bb6\u5ead\u7f51\u7edc\u7684\u5927\u89c4\u6a21\u6ee5\u53d1\u5783\u573e\u90ae\u4ef6\u3002\u4f46\u5bf9\u81ea\u5efa\u670d\u52a1\u5668\u6765\u8bf4\uff0c\u8fd9\u4f1a\u963b\u65ad\u76f4\u63a5\u6295\u9012\u8def\u5f84\uff0c\u4f60\u4e0d\u5f97\u4e0d\u4f9d\u8d56\u975e\u6807\u51c6\u7aef\u53e3\u6216 SMTP \u4e2d\u7ee7\u670d\u52a1\u6765\u8f6c\u53d1\u90ae\u4ef6\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u6d4b\u8bd5\u4e2d\uff0c\u8bb8\u591a\u4e2d\u5c0f\u4f01\u4e1a\u53d1\u73b0\uff0c\u4ed6\u4eec\u7684\u81ea\u5efa\u90ae\u4ef6\u670d\u52a1\u5668\u867d\u7136\u53ef\u4ee5\u53d1\u51fa\u90ae\u4ef6\uff0c\u5374\u65e0\u6cd5\u4ece\u5916\u90e8\u670d\u52a1\u5668\uff08\u5982 Gmail\u3001Yahoo \u7b49\uff09\u63a5\u6536\u90ae\u4ef6\u300225 \u7aef\u53e3\u7684\u5c01\u9501\u4f1a\u963b\u6b62\u6765\u81ea\u5916\u90e8\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u4ece\u800c\u4f7f\u670d\u52a1\u5668\u65e0\u6cd5\u63a5\u6536\u5916\u90e8\u90ae\u4ef6\uff0c\u4e25\u91cd\u5e72\u6270\u4e1a\u52a1\u6c9f\u901a\u3002<\/p>\n<p>\u4f60\u53ef\u80fd\u4f1a\u9047\u5230\u4ee5\u4e0b\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\n<p>\u4f60\u7684\u670d\u52a1\u5668\u65e0\u6cd5\u76f4\u63a5\u5c06\u90ae\u4ef6\u6295\u9012\u5230\u5176\u4ed6\u90ae\u4ef6\u670d\u52a1\u5668\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f60\u4e0d\u5f97\u4e0d\u4f7f\u7528\u4e2d\u7ee7\u670d\u52a1\uff0c\u6216\u6539\u7528 587\u3001465 \u7b49\u5176\u4ed6\u7aef\u53e3\u8fdb\u884c\u53d1\u9001\u3002<\/p>\n<\/li>\n<li>\n<p>\u81ea\u52a8\u5316\u90ae\u4ef6\u548c\u901a\u77e5\u65e0\u6cd5\u5230\u8d26\uff0c\u53ef\u80fd\u5f71\u54cd\u5ba2\u6237\u4f53\u9a8c\u548c\u4e1a\u52a1\u5173\u7cfb\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u8981\u514b\u670d\u8fd9\u4e9b\u969c\u788d\uff0c\u4f60\u5fc5\u987b\u5bf9\u90ae\u4ef6\u7cfb\u7edf\u8fdb\u884c\u4e00\u5b9a\u7684\u8c03\u6574\uff0c\u6bd4\u5982\u5347\u7ea7\u5230\u4f01\u4e1a\u5bbd\u5e26\u7ebf\u8def\u3001\u4f7f\u7528\u7b2c\u4e09\u65b9 SMTP \u4e2d\u7ee7\u670d\u52a1\u7b49\u300225 \u7aef\u53e3\u7684\u5c01\u9501\u8feb\u4f7f\u4f60\u6539\u53d8\u539f\u6709\u67b6\u6784\uff0c\u91cd\u65b0\u8bbe\u8ba1\u90ae\u4ef6\u53d1\u9001\u8def\u5f84\uff0c\u4ee5\u4fdd\u6301\u6574\u4f53\u90ae\u4ef6\u670d\u52a1\u7684\u7a33\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n<h2>ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u540e\u7684\u89e3\u51b3\u65b9\u6848<\/h2>\n<h3>\u4f7f\u7528\u66ff\u4ee3 SMTP \u7aef\u53e3<\/h3>\n<p>\u8981\u7ed5\u8fc7 25 \u7aef\u53e3\u5c01\u9501\uff0c\u4f60\u53ef\u4ee5\u5c06\u90ae\u4ef6\u53d1\u9001\u5207\u6362\u5230\u5176\u4ed6 SMTP \u7aef\u53e3\u3002\u5927\u591a\u6570\u73b0\u4ee3\u90ae\u4ef6\u670d\u52a1\u5546\u90fd\u63a8\u8350\u4f7f\u7528 587 \u7aef\u53e3\u7528\u4e8e\u53d1\u9001\u90ae\u4ef6\u3002\u8be5\u7aef\u53e3\u652f\u6301\u8eab\u4efd\u9a8c\u8bc1\u548c TLS \u52a0\u5bc6\uff0c\u53ef\u6709\u6548\u4fdd\u62a4\u4f60\u7684\u90ae\u4ef6\u5185\u5bb9\u3002\u5982\u679c 587 \u7aef\u53e3\u65e0\u6cd5\u4f7f\u7528\uff0c\u4f60\u53ef\u4ee5\u8003\u8651 465 \u7aef\u53e3\uff0c\u5b83\u5728\u8fde\u63a5\u5efa\u7acb\u4e4b\u521d\u5c31\u542f\u7528 SSL \u52a0\u5bc6\u3002\u90e8\u5206\u670d\u52a1\u5546\u8fd8\u4f1a\u5f00\u653e 2525 \u4f5c\u4e3a\u5907\u7528\u9009\u9879\u3002<\/p>\n<ul>\n<li>\n<p>\u7aef\u53e3 587\uff1a\u63a8\u8350\u7684\u90ae\u4ef6\u63d0\u4ea4\u7aef\u53e3\uff0c\u8981\u6c42\u8eab\u4efd\u9a8c\u8bc1\uff0c\u652f\u6301 TLS\u3002<\/p>\n<\/li>\n<li>\n<p>\u7aef\u53e3 465\uff1a\u66f4\u591a\u7528\u4e8e\u65e7\u7cfb\u7edf\uff0c\u8fde\u63a5\u4e00\u5f00\u59cb\u5c31\u4f7f\u7528 SSL \u52a0\u5bc6\u3002<\/p>\n<\/li>\n<li>\n<p>\u7aef\u53e3 2525\uff1a\u5728\u5176\u4ed6\u7aef\u53e3\u53d7\u9650\u65f6\u7684\u4e00\u79cd\u66ff\u4ee3\u9009\u62e9\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5982\u4eca\uff0c587 \u7aef\u53e3\u57fa\u672c\u5df2\u6210\u4e3a\u5b89\u5168\u90ae\u4ef6\u63d0\u4ea4\u7684\u9ed8\u8ba4\u6807\u51c6\u3002\u4f7f\u7528\u8be5\u7aef\u53e3\uff0c\u4f60\u65e2\u80fd\u83b7\u5f97\u66f4\u5f3a\u7684\u5b89\u5168\u6027\u548c\u8eab\u4efd\u9a8c\u8bc1\u673a\u5236\uff0c\u4e5f\u80fd\u63d0\u5347\u6574\u4f53\u6295\u9012\u6210\u529f\u7387\u3002ISP \u5bf9 587 \u7aef\u53e3\u6001\u5ea6\u66f4\u4e3a\u53cb\u597d\uff0c\u56e0\u4e3a\u5b83\u5728\u6280\u672f\u4e0a\u6709\u5229\u4e8e\u51cf\u5c11\u5783\u573e\u90ae\u4ef6\uff0c\u5e76\u652f\u6301\u66f4\u4e25\u683c\u7684\u52a0\u5bc6\u7b56\u7565\u3002<\/p>\n<p>\u901a\u8fc7 587 \u548c 465 \u7aef\u53e3\uff0c\u4f60\u53ef\u4ee5\u6709\u6548\u7ed5\u5f00 ISP \u7684 25 \u7aef\u53e3\u9650\u5236\uff0c\u540c\u65f6\u5229\u7528 TLS \u7b49\u52a0\u5bc6\u534f\u8bae\u4fdd\u62a4\u6570\u636e\u3001\u4f18\u5316\u90ae\u4ef6\u6295\u9012\u3002<\/p>\n<h3>\u4f7f\u7528\u5e26\u8eab\u4efd\u9a8c\u8bc1\u7684\u90ae\u4ef6\u670d\u52a1<\/h3>\n<p>\u501f\u52a9\u5e26\u8eab\u4efd\u9a8c\u8bc1\u7684 SMTP \u670d\u52a1\uff0c\u4f60\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63d0\u5347\u90ae\u4ef6\u5b89\u5168\u6027\u300225 \u7aef\u53e3\u65e2\u4e0d\u5f3a\u5236\u8eab\u4efd\u9a8c\u8bc1\uff0c\u4e5f\u4e0d\u5f3a\u5236\u52a0\u5bc6\uff0c\u56e0\u6b64\u975e\u5e38\u5bb9\u6613\u88ab\u6ee5\u7528\u3002\u800c\u5f53\u4f60\u4f7f\u7528 587 \u6216 465 \u8fd9\u7c7b\u7aef\u53e3\u65f6\uff0c\u901a\u5e38\u9700\u8981\u63d0\u4f9b\u7528\u6237\u540d\u548c\u5bc6\u7801\u6765\u8fdb\u884c\u8eab\u4efd\u9a8c\u8bc1\uff0c\u4ece\u800c\u786e\u4fdd\u53ea\u6709\u6388\u6743\u7528\u6237\u624d\u80fd\u53d1\u9001\u90ae\u4ef6\u3002<\/p>\n<ul>\n<li>\n<p>587 \u7aef\u53e3\u9700\u8981\u8eab\u4efd\u9a8c\u8bc1\uff0c\u5e76\u652f\u6301 TLS \u52a0\u5bc6\u3002<\/p>\n<\/li>\n<li>\n<p>465 \u7aef\u53e3\u5728\u4f1a\u8bdd\u4e00\u5f00\u59cb\u5c31\u5f00\u542f SSL \u52a0\u5bc6\uff0c\u53ef\u9632\u6b62\u964d\u7ea7\u653b\u51fb\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6b64\u5916\uff0c\u4f60\u8fd8\u4f1a\u83b7\u5f97\u66f4\u597d\u7684\u6295\u9012\u8868\u73b0\u3002\u90ae\u4ef6\u670d\u52a1\u5546\u901a\u5e38\u4f1a\u5c06\u5e26\u8eab\u4efd\u9a8c\u8bc1\u7684\u6d41\u91cf\u8bc6\u522b\u4e3a\u201c\u53ef\u4fe1\u53d1\u9001\u6e90\u201d\uff0c\u66f4\u5c11\u5c06\u5176\u8bef\u5224\u4e3a\u5783\u573e\u90ae\u4ef6\u3002\u8fd9\u6837\uff0c\u4f60\u65e2\u80fd\u63d0\u9ad8\u5b89\u5168\u6027\uff0c\u53c8\u80fd\u964d\u4f4e\u88ab\u5783\u573e\u8fc7\u6ee4\u5668\u62e6\u622a\u7684\u6982\u7387\u3002<\/p>\n<h3>\u8054\u7cfb ISP \u7533\u8bf7\u7aef\u53e3\u8bbf\u95ee<\/h3>\n<p>\u5982\u679c\u4f60\u786e\u5b9e\u6709\u7279\u6b8a\u9700\u6c42\u5fc5\u987b\u4f7f\u7528 25 \u7aef\u53e3\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u8054\u7cfb ISP \u7533\u8bf7\u5f00\u901a\u4f8b\u5916\u3002\u6709\u4e9b ISP \u4f1a\u9488\u5bf9\u4f01\u4e1a\u8d26\u6237\u6216\u66f4\u9ad8\u7ea7\u522b\u7684\u5957\u9910\u63d0\u4f9b\u89e3\u5c01\u670d\u52a1\uff0c\u4f60\u9700\u8981\u67e5\u770b\u5176\u76f8\u5173\u653f\u7b56\u5e76\u6309\u6d41\u7a0b\u63d0\u4ea4\u7533\u8bf7\u3002<\/p>\n<ul>\n<li>\n<p>\u767b\u5f55 ISP \u63d0\u4f9b\u7684\u7528\u6237\u7ba1\u7406\u6216\u670d\u52a1\u95e8\u6237\uff0c\u627e\u5230\u81ea\u52a9\u8bca\u65ad\u6216\u5de5\u5355\u5165\u53e3\u3002<\/p>\n<\/li>\n<li>\n<p>\u8fd0\u884c\u76f8\u5e94\u8bca\u65ad\uff0c\u6216\u63d0\u4ea4\u5de5\u5355\uff0c\u7533\u8bf7\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u8c41\u514d 25 \u7aef\u53e3\u5c01\u9501\u3002<\/p>\n<\/li>\n<li>\n<p>\u5927\u591a\u6570 ISP \u4f1a\u5c01\u9501\u9664\u5176\u5b98\u65b9 SMTP \u670d\u52a1\u5668\u4ee5\u5916\u7684\u6240\u6709\u5916\u53d1 25 \u7aef\u53e3\u8fde\u63a5\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u4ee5\u5148\u5728\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u7c7b\u4f3c <code>telnet &lt;remote MX&gt; 25<\/code> \u7684\u547d\u4ee4\u8fdb\u884c\u6392\u67e5\u3002\u5982\u679c\u786e\u8ba4\u662f 25 \u7aef\u53e3\u88ab\u5c01\uff0c\u53ef\u4ee5\u4e0e ISP \u6c9f\u901a\u662f\u5426\u6709\u89e3\u5c01\u65b9\u6848\uff0c\u6216\u8005\u6539\u4e3a\u5728 587 \u7aef\u53e3\u4e0a\u4f7f\u7528 SMTP \u4e2d\u7ee7\u670d\u52a1\u3002\u7136\u540e\u5728\u4f60\u7684\u90ae\u4ef6\u4f20\u8f93\u4ee3\u7406\uff08MTA\uff09\u4e2d\u914d\u7f6e\u6b63\u786e\u7684\u4e2d\u7ee7\u8bbe\u7f6e\uff0c\u5e76\u901a\u8fc7\u8fde\u901a\u6027\u6d4b\u8bd5\u5de5\u5177\u6765\u9a8c\u8bc1\u90ae\u4ef6\u662f\u5426\u53ef\u4ee5\u6b63\u5e38\u6295\u9012\u3002<\/p>\n<p>\u5f53\u524d\uff0c587 \u7aef\u53e3\u5df2\u88ab\u5e7f\u6cdb\u8ba4\u53ef\u4e3a\u90ae\u4ef6\u63d0\u4ea4\u7684\u5b98\u65b9\u6807\u51c6\u7aef\u53e3\u3002\u5b83\u5f97\u5230\u4e3b\u6d41\u670d\u52a1\u5546\u7684\u666e\u904d\u652f\u6301\uff0c\u4e5f\u66f4\u4e0d\u5bb9\u6613\u88ab\u5c01\u9501\uff0c\u56e0\u6b64\u5bf9\u5927\u591a\u6570\u7528\u6237\u6765\u8bf4\u662f\u9996\u9009\u3002<\/p>\n<div dividerstyle=\"solid\" size=\"large\" color=\"#D1D1D1\" class=\"qc-divider-wrapper\">\n<div class=\"qc-divider\" style=\"border-top-style: solid; width: 100%; border-top-color: rgb(209, 209, 209);\"><\/div>\n<\/div>\n<p>ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\uff0c\u4e3b\u8981\u662f\u51fa\u4e8e\u5b89\u5168\u65b9\u9762\u7684\u8003\u8651\u3002\u8fd9\u80fd\u4fdd\u62a4\u5e73\u53f0\u3001\u9884\u9632\u6ee5\u7528\uff0c\u5e76\u7b26\u5408\u884c\u4e1a\u6574\u4f53\u8d8b\u52bf\u4e0e\u6807\u51c6\u3002<\/p>\n<ul>\n<li>\n<p>ISP \u5e0c\u671b\u4e3a\u4f60\u548c\u5176\u4ed6\u7528\u6237\u4fdd\u6301\u4e00\u4e2a\u66f4\u5b89\u5168\u7684\u7f51\u7edc\u73af\u5883\u3002<\/p>\n<\/li>\n<li>\n<p>\u5c01\u9501 25 \u7aef\u53e3\u6709\u52a9\u4e8e\u963b\u65ad\u5783\u573e\u90ae\u4ef6\uff0c\u7ef4\u62a4\u4f60\u7684\u90ae\u4ef6\u4fe1\u8a89\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u914d\u5408\u4f7f\u7528 SPF\u3001DKIM \u548c DMARC \u7b49\u5b89\u5168\u673a\u5236\uff0c\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63d0\u5347\u90ae\u4ef6\u6295\u9012\u6210\u529f\u7387\u3002\u8fd9\u4e9b\u673a\u5236\u80fd\u9a8c\u8bc1\u4f60\u7684\u8eab\u4efd\u3001\u964d\u4f4e\u88ab\u89c6\u4f5c\u5783\u573e\u90ae\u4ef6\u7684\u98ce\u9669\u3002<\/p>\n<p>\u5982\u679c\u4f60\u53d1\u73b0 25 \u7aef\u53e3\u65e0\u6cd5\u53d1\u9001\u90ae\u4ef6\uff0c\u5c31\u5e94\u5c3d\u5feb\u5207\u6362\u5230 587 \u7aef\u53e3\u6216\u4f7f\u7528\u53ef\u9760\u7684 SMTP \u7f51\u5173\u3002\u52a1\u5fc5\u5f00\u542f\u8eab\u4efd\u9a8c\u8bc1\uff0c\u4ee5\u4fdd\u969c\u90ae\u4ef6\u5185\u5bb9\u5b89\u5168\u3002<\/p>\n<h2>\u5e38\u89c1\u95ee\u9898\uff08FAQ\uff09<\/h2>\n<h3>\u4e3a\u4ec0\u4e48\u5927\u591a\u6570 ISP \u90fd\u4f1a\u5c4f\u853d SMTP 25 \u7aef\u53e3\uff1f<\/h3>\n<p>\u4f60\u4f1a\u770b\u5230 ISP \u5c4f\u853d 25 \u7aef\u53e3\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u904f\u5236\u5783\u573e\u90ae\u4ef6\u5e76\u4fdd\u62a4\u7f51\u7edc\u5b89\u5168\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u7f51\u7edc\u6574\u4f53\u4fe1\u8a89\u53d7\u635f\uff0c\u4e5f\u80fd\u963b\u6b62\u88ab\u611f\u67d3\u7684\u7535\u8111\u5411\u5916\u5927\u91cf\u53d1\u9001\u5783\u573e\u90ae\u4ef6\u3002<\/p>\n<h3>\u5bb6\u5ead\u5bbd\u5e26\u53ef\u4ee5\u81ea\u884c\u89e3\u5c01 25 \u7aef\u53e3\u5417\uff1f<\/h3>\n<p>\u5927\u591a\u6570 ISP \u4e0d\u5141\u8bb8\u5728\u5bb6\u5ead\u5957\u9910\u4e2d\u89e3\u5c01 25 \u7aef\u53e3\u3002\u4f60\u53ef\u4ee5\u8054\u7cfb ISP \u4e86\u89e3\u662f\u5426\u6709\u4f01\u4e1a\u5957\u9910\u6216\u4ed8\u8d39\u9009\u9879\uff0c\u6216\u8005\u76f4\u63a5\u6539\u7528 587\u3001465 \u7b49\u66ff\u4ee3\u7aef\u53e3\u3002<\/p>\n<h3>\u54ea\u4e2a\u7aef\u53e3\u6700\u9002\u5408\u5b89\u5168\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\uff1f<\/h3>\n<p>\u5efa\u8bae\u4f7f\u7528 587 \u7aef\u53e3\u53d1\u9001\u90ae\u4ef6\u3002\u8be5\u7aef\u53e3\u652f\u6301\u8eab\u4efd\u9a8c\u8bc1\u548c\u52a0\u5bc6\uff0c\u65e2\u80fd\u4fdd\u8bc1\u90ae\u4ef6\u5185\u5bb9\u5b89\u5168\uff0c\u53c8\u80fd\u63d0\u5347\u6574\u4f53\u6295\u9012\u6210\u529f\u7387\u3002<\/p>\n<h3>\u5982\u4f55\u5224\u65ad\u6211\u7684 ISP \u662f\u5426\u5c4f\u853d\u4e86 25 \u7aef\u53e3\uff1f<\/h3>\n<p>\u4f60\u53ef\u4ee5\u5728\u7ec8\u7aef\u4e2d\u8fd0\u884c\u5982\u4e0b\u547d\u4ee4\u6d4b\u8bd5 25 \u7aef\u53e3\u8fde\u901a\u6027\uff1a<\/p>\n<pre><code>telnet smtp.example.com 25\r\n<\/code><\/pre>\n<p>\u5982\u679c\u51fa\u73b0\u8fde\u63a5\u8d85\u65f6\u6216\u8fde\u63a5\u88ab\u62d2\u7edd\u7684\u63d0\u793a\uff0c\u5c31\u8bf4\u660e ISP \u5f88\u53ef\u80fd\u5df2\u7ecf\u5c4f\u853d\u4e86\u8be5\u7aef\u53e3\u3002<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4f60\u53ef\u80fd\u4f1a\u53d1\u73b0\uff0c\u4ece\u5bb6\u5ead\u7f51\u7edc\u53d1\u9001\u90ae\u4ef6\u6709\u65f6\u4f1a\u5931\u8d25\u3002\u5927\u591a\u6570 ISP \u4f1a\u5c4f\u853d SMTP \u7aef\u53e3 25\uff0c\u4ee5\u963b\u6b62\u5783\u573e\u90ae\u4ef6\u5e76\u4fdd\u62a4\u5176\u7f51\u7edc\u514d\u53d7\u6ee5\u7528\u3002\u5783\u573e\u90ae\u4ef6\u53d1\u9001\u8005\u7ecf\u5e38\u76ef\u4e0a\u8be5\u7aef\u53e3\uff0c\u4ece\u88ab\u611f\u67d3\u7684\u7535\u8111\u6279\u91cf\u53d1\u9001\u90ae\u4ef6\u3002\u4ece 2000 \u5e74\u4ee3\u521d\u5f00\u59cb\uff0c\u51e0\u4e4e\u6240\u6709 ISP \u548c\u8bb8\u591a\u9999\u6e2f\u670d\u52a1\u5668\u79df\u7528\u63d0\u4f9b\u5546\u90fd\u91c7\u7528\u4e86\u8fd9\u79cd\u505a\u6cd5\uff0c\u4ee5\u4fdd\u6301\u826f\u597d\u7684\u90ae\u4ef6\u4fe1\u8a89\u3002\u8fd9\u4e00\u4e3e\u63aa\u4f1a\u76f4\u63a5\u5f71\u54cd\u4f60\u901a\u8fc7\u4f20\u7edf\u65b9\u5f0f\u53d1\u9001\u90ae\u4ef6\u7684\u80fd\u529b\u3002 \u8981\u70b9\u901f\u89c8 ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u4ee5\u9632\u6b62\u5783\u573e\u90ae\u4ef6\u548c\u4fdd\u62a4\u7f51\u7edc\u5b89\u5168\uff0c\u4ece\u800c\u63d0\u9ad8\u90ae\u4ef6\u6295\u9012\u7684\u53ef\u9760\u6027\u3002 \u6539\u7528 587 \u6216 465 \u7b49\u66ff\u4ee3\u7aef\u53e3\u6765\u5b89\u5168\u53d1\u9001\u90ae\u4ef6\uff0c\u8fd9\u4e9b\u7aef\u53e3\u652f\u6301\u8eab\u4efd\u9a8c\u8bc1\u548c\u52a0\u5bc6\u3002 \u5982\u679c\u4f60\u8fd0\u884c\u90ae\u4ef6\u670d\u52a1\u5668\uff0c\u53ef\u8003\u8651\u4f7f\u7528 SMTP \u4e2d\u7ee7\u670d\u52a1\u6765\u7ed5\u8fc7 25 \u7aef\u53e3\u9650\u5236\uff0c\u7ef4\u6301\u90ae\u4ef6\u6b63\u5e38\u6536\u53d1\u3002 \u5982\u679c\u4f60\u662f\u5546\u4e1a\u7528\u6237\uff0c\u53ef\u4ee5\u8054\u7cfb ISP\uff0c\u7533\u8bf7\u5bf9 25 \u7aef\u53e3\u5c01\u9501\u7b56\u7565\u7684\u4f8b\u5916\u5904\u7406\u3002 \u4f7f\u7528 SPF\u3001DKIM \u548c DMARC \u7b49\u90ae\u4ef6\u8ba4\u8bc1\u673a\u5236\uff0c\u53ef\u63d0\u5347\u6295\u9012\u6210\u529f\u7387\u5e76\u964d\u4f4e\u88ab\u89c6\u4e3a\u5783\u573e\u90ae\u4ef6\u7684\u98ce\u9669\u3002 \u4ec0\u4e48\u662f SMTP 25 \u7aef\u53e3\uff1f SMTP 25 \u7aef\u53e3\u4e0e\u90ae\u4ef6\u4f20\u8f93 \u4f60\u6bcf\u5929\u90fd\u5728\u4f7f\u7528\u7535\u5b50\u90ae\u4ef6\uff0c\u4f46\u53ef\u80fd\u5e76\u4e0d\u4e86\u89e3 SMTP 25 \u7aef\u53e3\u5728\u80cc\u540e\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002\u8be5\u7aef\u53e3\u662f\u90ae\u4ef6\u670d\u52a1\u5668\u4e4b\u95f4\u53d1\u9001\u6d88\u606f\u7684\u4e3b\u901a\u9053\u3002\u5f53\u4f60\u53d1\u9001\u4e00\u5c01\u7535\u5b50\u90ae\u4ef6\u65f6\uff0c\u90ae\u4ef6\u4f1a\u5148\u4ece\u4f60\u7684\u8bbe\u5907\u4f20\u5230\u670d\u52a1\u63d0\u4f9b\u5546\u7684\u670d\u52a1\u5668\uff0c\u7136\u540e\u670d\u52a1\u5668\u901a\u8fc7 SMTP 25 \u7aef\u53e3\u5c06\u90ae\u4ef6\u4e2d\u7ee7\u7ed9\u6536\u4ef6\u65b9\u7684\u90ae\u4ef6\u670d\u52a1\u5668\u30021982 \u5e74\uff0cSMTP 25 \u7aef\u53e3\u88ab\u786e\u7acb\u4e3a\u7535\u5b50\u90ae\u4ef6\u4f20\u8f93\u7684\u6807\u51c6\u3002\u4ece\u90a3\u65f6\u8d77\uff0c\u5b83\u4e00\u76f4\u4e3a\u670d\u52a1\u5668\u5230\u670d\u52a1\u5668\u7684\u901a\u4fe1\u63d0\u4f9b\u53ef\u9760\u901a\u9053\uff0c\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u907f\u514d\u4e86\u4e2d\u95f4\u4eba\u653b\u51fb\u7b49\u98ce\u9669\u3002 \u76f4\u5230\u4eca\u5929\uff0cSMTP 25 \u7aef\u53e3\u4ecd\u7136\u662f\u670d\u52a1\u5668\u4e4b\u95f4\u4f20\u8f93\u90ae\u4ef6\u7684\u91cd\u8981\u57fa\u7840\u3002\u5b83\u8d1f\u8d23\u8def\u7531\u6d88\u606f\uff0c\u5305\u62ec\u5404\u79cd\u81ea\u52a8\u5316\u7cfb\u7edf\u901a\u77e5\u3002\u5927\u591a\u6570\u73b0\u4ee3\u90ae\u4ef6\u5ba2\u6237\u7aef\u4e0d\u4f1a\u76f4\u63a5\u4f7f\u7528 [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-cn\/blog\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":11,"featured_media":32675,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[76],"tags":[],"class_list":["post-32678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u5bf9\u90ae\u4ef6\u6295\u9012\u7684\u5f71\u54cd<\/title>\n<meta name=\"description\" content=\"ISP \u5c4f\u853d SMTP 25 \u7aef\u53e3\u4ee5\u9632\u6b62\u5783\u573e\u90ae\u4ef6\u5e76\u4fdd\u62a4\u7f51\u7edc\u5b89\u5168\uff0c\u8fd9\u4f1a\u5f71\u54cd\u90ae\u4ef6\u6295\u9012\u548c\u81ea\u5efa\u90ae\u4ef6\u670d\u52a1\u5668\u3002\u4e86\u89e3\u5982\u4f55\u89e3\u51b3\u4ee5\u786e\u4fdd\u90ae\u4ef6\u53ef\u9760\u9001\u8fbe\u3002\" \/>\n<meta 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