{"id":32679,"date":"2026-05-21T15:19:12","date_gmt":"2026-05-21T07:19:12","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/"},"modified":"2026-05-21T15:21:09","modified_gmt":"2026-05-21T07:21:09","slug":"how-isp-blocking-of-smtp-port-25-impacts-email-delivery","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/","title":{"rendered":"ISP \u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\u5c0d\u90f5\u4ef6\u6295\u905e\u7684\u5f71\u97ff"},"content":{"rendered":"<p>\u4f60\u53ef\u80fd\u6703\u767c\u73fe\uff0c\u5f9e\u5bb6\u7528\u7db2\u8def\u5bc4\u9001\u90f5\u4ef6\u6709\u6642\u6703\u5931\u6557\u3002\u591a\u6578 ISP \u6703\u5c01\u9396 <a target=\"_blank\" href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/fix-gmail-email-rejection-caused-by-dns-ptr-issues\/\">SMTP \u9023\u63a5\u57e0<\/a> 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\u6240\u5728\u7db2\u8def\u5c31\u6709\u53ef\u80fd\u88ab\u5217\u5165\u9ed1\u540d\u55ae\u3002\u4e00\u65e6\u767c\u751f\u9019\u7a2e\u60c5\u6cc1\uff0c\u5927\u578b\u90f5\u4ef6\u670d\u52d9\u4f9b\u61c9\u5546\u53ef\u80fd\u6703\u76f4\u63a5\u62d2\u6536\u4f86\u81ea\u6b64\u7db2\u8def\u7684\u6240\u6709\u90f5\u4ef6\uff0c\u5373\u4fbf\u4f60\u500b\u4eba\u5b8c\u5168\u6c92\u6709\u9055\u898f\u884c\u70ba\u3002<\/p>\n<p>\u900f\u904e\u5c01\u9396 25 \u9023\u63a5\u57e0\uff0cISP \u80fd\u66f4\u597d\u5730\u63a7\u5236\u4f86\u81ea\u53d7\u653b\u9677\u88dd\u7f6e\u7684\u60e1\u610f\u90f5\u4ef6\u6d41\u91cf\uff0c\u5728\u9019\u4e9b\u90f5\u4ef6\u96e2\u958b\u7db2\u8def\u4e4b\u524d\u5c31\u5148\u52a0\u4ee5\u963b\u64cb\uff0c\u6709\u52a9\u65bc ISP \u7dad\u6301\u826f\u597d\u4fe1\u8b7d\u3001\u907f\u514d\u906d\u9ed1\u540d\u55ae\u6514\u622a\uff1b\u9019\u4e5f\u5c31\u610f\u5473\u8457\uff0c\u4f60\u7684\u5408\u6cd5\u90f5\u4ef6\u66f4\u6709\u6a5f\u6703\u9806\u5229\u9001\u9054\u3002<\/p>\n<h3>\u5bb6\u7528\u8207\u4f01\u696d\u7528\u6236\u7684\u9650\u5236\u5dee\u7570<\/h3>\n<p>\u4e26\u975e\u6240\u6709\u7528\u6236\u9762\u5c0d\u7684\u898f\u5247\u90fd\u4e00\u6a23\u3002\u591a\u6578\u5bb6\u7528\u5bec\u983b\u7528\u6236\u7684 25 \u9023\u63a5\u57e0\u6703\u88ab\u9810\u8a2d\u5c01\u9396\uff0c\u4ee5\u9632\u5783\u573e\u90f5\u4ef6\u4e26\u63d0\u5347\u5b89\u5168\u6027\u3002\u82e5\u4f60\u4f7f\u7528\u7684\u662f\u4f01\u696d\u7dda\u8def\uff0c\u5247\u6709\u53ef\u80fd\u88ab\u5141\u8a31\u4f7f\u7528 25 \u9023\u63a5\u57e0\uff0c\u4f46\u5f80\u5f80\u9700\u8981\u652f\u4ed8\u66f4\u9ad8\u7684\u8a02\u95b1\u8cbb\u3002<\/p>\n<ul>\n<li>\n<p>\u5bb6\u7528\u7528\u6236\u901a\u5e38\u6703\u56e0\u5b89\u5168\u56e0\u7d20\u800c\u88ab\u5c01\u9396 25 \u9023\u63a5\u57e0\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f01\u696d\u7528\u6236\u5728\u90e8\u5206\u65b9\u6848\u4e2d\u53ef\u53d6\u5f97 25 \u9023\u63a5\u57e0\u7684\u5b58\u53d6\u6b0a\u9650\uff0c\u4f46\u50f9\u683c\u901a\u5e38\u8f03\u9ad8\u3002<\/p>\n<\/li>\n<li>\n<p>\u6709\u4e9b\u7528\u6236\u6703\u6539\u7528\u5141\u8a31\u81ea\u5efa\u90f5\u4ef6\u4f3a\u670d\u5668\u7684\u670d\u52d9\u4f9b\u61c9\u5546\uff0c\u9019\u5728\u4f01\u696d\u7dda\u8def\u4e2d\u8f03\u70ba\u5e38\u898b\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5373\u4f7f\u5728\u5177\u5099\u865b\u64ec\u79c1\u4eba\u4f3a\u670d\u5668\uff08VPS\uff09\u6216\u4f3a\u670d\u5668\u8a17\u7ba1\uff08colocation\uff09\u7684\u8cc7\u6599\u4e2d\u5fc3\u74b0\u5883\u4e2d\uff0cISP \u4e5f\u53ef\u80fd\u9810\u8a2d\u5c01\u9396 25 \u9023\u63a5\u57e0\u3002\u5c0d\u5bb6\u7528\u5bec\u983b\u5e33\u865f\u800c\u8a00\uff0c\u5165\u7ad9 25 \u9023\u63a5\u57e0\u88ab\u5c01\u7684\u60c5\u6cc1\u66f4\u70ba\u666e\u904d\u3002ISP \u5728\u5c01\u9396 25 \u9023\u63a5\u57e0\u6642\u4e5f\u5fc5\u9808\u9075\u5b88\u81ea\u8eab\u7684\u670d\u52d9\u689d\u6b3e\uff1a\u5728\u5bb6\u7528\u7dda\u8def\u4e0a\u67b6\u8a2d\u4f3a\u670d\u5668\u901a\u5e38\u662f\u4e0d\u88ab\u5141\u8a31\u7684\uff0c\u82e5\u4f60\u8a66\u5716\u7e5e\u904e\u5c01\u9396\uff0c\u53ef\u80fd\u6703\u9055\u53cd\u4f60\u8207\u696d\u8005\u4e4b\u9593\u7684\u5408\u7d04\u3002<\/p>\n<blockquote>\n<p>\u6ce8\u610f\uff1a\u5c01\u9396 25 \u9023\u63a5\u57e0\u4e26\u4e0d\u6703\u963b\u6b62\u4f60\u6539\u7528\u5176\u4ed6\u9023\u63a5\u57e0\u642d\u914d\u8eab\u5206\u9a57\u8b49\u4f86\u5bc4\u9001\u90f5\u4ef6\u3002\u4f60\u4f9d\u7136\u53ef\u4ee5\u900f\u904e\u5b89\u5168\u7684\u66ff\u4ee3\u65b9\u5f0f\u5bc4\u9001\u90f5\u4ef6\u3002<\/p>\n<\/blockquote>\n<h2>ISP \u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\u5c0d\u90f5\u4ef6\u670d\u52d9\u7684\u5f71\u97ff<\/h2>\n<h3>\u5f9e\u5bb6\u7528\u7db2\u8def\u5bc4\u9001\u90f5\u4ef6<\/h3>\n<p>\u7576\u4f60\u5617\u8a66\u5f9e\u5bb6\u7528\u7db2\u8def\u5bc4\u9001\u90f5\u4ef6\u6642\uff0c\u53ef\u80fd\u6703\u767c\u73fe\u90f5\u4ef6\u9072\u9072\u5bc4\u4e0d\u51fa\u53bb\uff0c\u751a\u81f3\u5b8c\u5168\u7121\u6cd5\u9001\u9054\u3002\u4e00\u65e6 ISP \u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\uff0c\u4f60\u7684\u90f5\u4ef6\u670d\u52d9\u5c31\u6703\u9762\u81e8\u591a\u91cd\u969c\u7919\u3002\u5927\u591a\u6578\u90f5\u4ef6\u7528\u6236\u7aef\u5c07\u7121\u6cd5\u9023\u7dda\u81f3\u76ee\u6a19\u90f5\u4ef6\u4f3a\u670d\u5668\uff0c\u5c0e\u81f4\u90f5\u4ef6\u5361\u5728\u5bc4\u4ef6\u5323\uff0c\u4f60\u53ef\u80fd\u6703\u906d\u9047\u9577\u6642\u9593\u5ef6\u9072\uff0c\u6291\u6216\u5fb9\u5e95\u5bc4\u9001\u5931\u6557\u3002\u81ea\u52d5\u5316\u90f5\u4ef6\uff08\u4f8b\u5982\u4f7f\u7528\u8005\u901a\u77e5\u3001\u8a02\u55ae\u78ba\u8a8d\u7b49\uff09\u540c\u6a23\u53ef\u80fd\u7121\u6cd5\u6210\u529f\u9001\u9054\u3002\u9019\u4e9b\u554f\u984c\u4e0d\u50c5\u5f71\u97ff\u4f60\u7684\u65e5\u5e38\u6e9d\u901a\uff0c\u751a\u81f3\u53ef\u80fd\u5c0d\u71df\u904b\u9020\u6210\u885d\u64ca\u3002<\/p>\n<p>\u82e5\u4f60\u5728\u5bb6\u4e2d\u81ea\u5efa\u90f5\u4ef6\u4f3a\u670d\u5668\uff0c\u5c31\u5fc5\u9808\u6539\u7528 587 \u7b49\u9023\u63a5\u57e0\u9032\u884c\u52a0\u5bc6\u901a\u8a0a\u300225 \u9023\u63a5\u57e0\u96d6\u7136\u662f\u50b3\u7d71\u90f5\u4ef6\u4f3a\u670d\u5668\u901a\u9053\uff0c\u4f46\u56e0\u5b58\u5728\u906d\u6feb\u7528\u98a8\u96aa\u800c\u88ab ISP \u5c01\u9396\u3002\u8a31\u591a ISP \u7684\u7b2c\u4e00\u7dda\u4eba\u54e1\u5c0d 25 \u9023\u63a5\u57e0\u4e26\u4e0d\u719f\u6089\uff0c\u4e14\u7d93\u5e38\u5805\u7a31\u7121\u6cd5\u5728\u5bb6\u7528\u5bec\u983b\u4e0a\u66ff\u4f60\u89e3\u9664\u5c01\u9396\u3002<\/p>\n<p>\u7121\u8ad6\u5728\u500b\u4eba\u6216\u5de5\u4f5c\u60c5\u5883\u4e2d\uff0c\u4f60\u90fd\u96e2\u4e0d\u958b\u7a69\u5b9a\u53ef\u9760\u7684\u90f5\u4ef6\u670d\u52d9\u3002\u4e00\u65e6 25 \u9023\u63a5\u57e0\u88ab\u5c01\uff0c\u4f60\u5c31\u5fc5\u9808\u5c0b\u627e\u5176\u4ed6\u65b9\u5f0f\u5bc4\u9001\u90f5\u4ef6\uff0c\u4f8b\u5982\u6539\u7528\u5177\u8eab\u5206\u9a57\u8b49\u7684 SMTP \u670d\u52d9\uff0c\u6216\u5c07\u7528\u6236\u7aef\uff0f\u61c9\u7528\u7a0b\u5f0f\u6539\u8a2d\u70ba\u4f7f\u7528\u652f\u63f4\u52a0\u5bc6\u7684\u9023\u63a5\u57e0\u3002<\/p>\n<h3>\u5e38\u898b\u554f\u984c\u8207\u932f\u8aa4\u8a0a\u606f<\/h3>\n<p>\u7576 ISP \u5c01\u9396 25 \u9023\u63a5\u57e0\u6642\uff0c\u4f60\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u9023\u7dda\u5931\u6557\u8207\u6295\u905e\u5931\u6557\u7684\u60c5\u6cc1\u3002\u90f5\u4ef6\u7528\u6236\u7aef\u7121\u6cd5\u8207\u4f3a\u670d\u5668\u5efa\u7acb\u9023\u7dda\uff0c\u9032\u800c\u51fa\u73fe\u932f\u8aa4\u8a0a\u606f\u3002\u5e38\u898b\u554f\u984c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\n<p>\u90f5\u4ef6\u56e0\u9023\u63a5\u57e0\u88ab\u5c01\u9396\u800c\u7121\u6cd5\u6b63\u5e38\u5bc4\u51fa\u6216\u63a5\u6536\u3002<\/p>\n<\/li>\n<li>\n<p>\u51fa\u73fe\u9023\u7dda\u903e\u6642\uff08timeout\uff09\u6216\u9023\u7dda\u88ab\u62d2\u7d55\uff08connection refused\uff09\u7684\u932f\u8aa4\u3002<\/p>\n<\/li>\n<li>\n<p>\u90f5\u4ef6\u61c9\u7528\u7a0b\u5f0f\u7121\u6cd5\u6210\u529f\u5efa\u7acb\u9023\u7dda\u4f86\u6295\u905e\u8a0a\u606f\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u80fd\u6703\u770b\u5230\u985e\u4f3c\u4e0b\u5217\u932f\u8aa4\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\u82e5\u4f60\u7d93\u5e38\u770b\u5230\u4e0a\u8ff0\u932f\u8aa4\uff0c\u5f88\u53ef\u80fd\u662f ISP \u5df2\u5c01\u9396 25 \u9023\u63a5\u57e0\u3002\u4f60\u53ef\u4ee5\u6aa2\u67e5\u90f5\u4ef6\u7528\u6236\u7aef\u8a2d\u5b9a\uff0c\u6216\u806f\u7d61\u670d\u52d9\u4f9b\u61c9\u5546\u78ba\u8a8d\u3002<\/p>\n<\/blockquote>\n<p>\u9019\u4e9b\u554f\u984c\u6703\u56b4\u91cd\u524a\u5f31\u90f5\u4ef6\u670d\u52d9\u7684\u53ef\u9760\u6027\uff0c\u4f60\u53ef\u80fd\u932f\u5931\u91cd\u8981\u8a0a\u606f\uff0c\u4e5f\u53ef\u80fd\u7121\u6cd5\u5411\u5ba2\u6236\u5bc4\u51fa\u95dc\u9375\u901a\u77e5\u3002\u4e86\u89e3\u9019\u4e9b\u932f\u8aa4\u7684\u6839\u6e90\uff0c\u6709\u52a9\u65bc\u4f60\u66f4\u5feb\u627e\u5230\u89e3\u6c7a\u65b9\u6848\uff0c\u5118\u65e9\u6062\u5fa9\u6b63\u5e38\u7684\u90f5\u4ef6\u6536\u767c\u3002<\/p>\n<h3>\u5c0d\u81ea\u5efa\u90f5\u4ef6\u670d\u52d9\u7684\u5f71\u97ff<\/h3>\n<p>\u82e5\u4f60\u81ea\u884c\u67b6\u8a2d\u90f5\u4ef6\u4f3a\u670d\u5668\uff0c25 \u9023\u63a5\u57e0\u7684\u5c01\u9396\u6703\u5e36\u4f86\u91cd\u5927\u6311\u6230\u3002SMTP \u6a19\u6e96\u5c31\u662f\u5efa\u7acb\u5728 25 \u9023\u63a5\u57e0\u4e4b\u4e0a\uff0c\u5b83\u662f\u90f5\u4ef6\u5bc4\u9001\u6240\u5fc5\u9808\u7684\u901a\u9053\u3002ISP \u5c01\u9396\u6b64\u9023\u63a5\u57e0\uff0c\u662f\u70ba\u4e86\u9632\u6b62\u4f86\u81ea\u5bb6\u7528\u7db2\u8def\u7684\u5927\u91cf\u5783\u573e\u90f5\u4ef6\u3002\u4f46\u5c0d\u81ea\u5efa\u4f3a\u670d\u5668\u4f86\u8aaa\uff0c\u9019\u6703\u5207\u65b7\u76f4\u63a5\u6295\u905e\u8def\u5f91\uff0c\u4f60\u5c31\u5f97\u4f9d\u8cf4\u975e\u6a19\u6e96\u9023\u63a5\u57e0\u6216 SMTP \u4e2d\u7e7c\u670d\u52d9\u4f86\u8f49\u9001\u90f5\u4ef6\u3002<\/p>\n<p>\u5728\u5be6\u969b\u6e2c\u8a66\u4e2d\uff0c\u8a31\u591a\u4e2d\u5c0f\u4f01\u696d\u767c\u73fe\uff0c\u4ed6\u5011\u7684\u81ea\u5efa\u90f5\u4ef6\u4f3a\u670d\u5668\u96d6\u7136\u80fd\u5bc4\u51fa\u90f5\u4ef6\uff0c\u537b\u7121\u6cd5\u5f9e\u5916\u90e8\u4f3a\u670d\u5668\uff08\u5982 Gmail\u3001Yahoo \u7b49\uff09\u63a5\u6536\u90f5\u4ef6\u300225 \u9023\u63a5\u57e0\u7684\u5c01\u9396\u6703\u963b\u64cb\u5916\u90e8\u9023\u7dda\u8acb\u6c42\uff0c\u5c0e\u81f4\u4f3a\u670d\u5668\u7121\u6cd5\u63a5\u6536\u5916\u90e8\u90f5\u4ef6\uff0c\u56b4\u91cd\u5e72\u64fe\u5546\u52d9\u6e9d\u901a\u3002<\/p>\n<p>\u4f60\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u554f\u984c\uff1a<\/p>\n<ul>\n<li>\n<p>\u4f60\u7684\u4f3a\u670d\u5668\u7121\u6cd5\u76f4\u63a5\u5c07\u90f5\u4ef6\u6295\u905e\u81f3\u5176\u4ed6\u90f5\u4ef6\u4f3a\u670d\u5668\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f60\u5fc5\u9808\u4f7f\u7528\u4e2d\u7e7c\u670d\u52d9\uff0c\u6216\u6539\u7528 587\u3001465 \u7b49\u5176\u4ed6\u9023\u63a5\u57e0\u5bc4\u9001\u90f5\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u81ea\u52d5\u5316\u90f5\u4ef6\u8207\u901a\u77e5\u7121\u6cd5\u9001\u9054\uff0c\u53ef\u80fd\u5f71\u97ff\u5ba2\u6236\u9ad4\u9a57\u8207\u696d\u52d9\u95dc\u4fc2\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u8981\u514b\u670d\u9019\u4e9b\u969c\u7919\uff0c\u4f60\u5fc5\u9808\u5c0d\u90f5\u4ef6\u7cfb\u7d71\u505a\u51fa\u76f8\u61c9\u8abf\u6574\uff0c\u4f8b\u5982\u5347\u7d1a\u70ba\u4f01\u696d\u5bec\u983b\u7dda\u8def\u3001\u5c0e\u5165\u7b2c\u4e09\u65b9 SMTP \u4e2d\u7e7c\u670d\u52d9\u7b49\u300225 \u9023\u63a5\u57e0\u7684\u5c01\u9396\u8feb\u4f7f\u4f60\u6539\u8b8a\u539f\u6709\u67b6\u69cb\uff0c\u91cd\u65b0\u8a2d\u8a08\u90f5\u4ef6\u5bc4\u9001\u8def\u5f91\uff0c\u4ee5\u7dad\u6301\u6574\u9ad4\u90f5\u4ef6\u670d\u52d9\u7684\u7a69\u5b9a\u6027\u8207\u53ef\u9760\u6027\u3002<\/p>\n<h2>ISP \u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\u5f8c\u7684\u89e3\u6c7a\u65b9\u6848<\/h2>\n<h3>\u4f7f\u7528\u66ff\u4ee3 SMTP \u9023\u63a5\u57e0<\/h3>\n<p>\u82e5\u8981\u7e5e\u904e 25 \u9023\u63a5\u57e0\u5c01\u9396\uff0c\u4f60\u53ef\u4ee5\u5c07\u90f5\u4ef6\u5bc4\u9001\u5207\u63db\u81f3\u5176\u4ed6 SMTP \u9023\u63a5\u57e0\u3002\u591a\u6578\u73fe\u4ee3\u90f5\u4ef6\u670d\u52d9\u5546\u90fd\u5efa\u8b70\u4f7f\u7528 587 \u9023\u63a5\u57e0\u5bc4\u9001\u90f5\u4ef6\u3002\u6b64\u9023\u63a5\u57e0\u652f\u63f4\u8eab\u5206\u9a57\u8b49\u8207 TLS \u52a0\u5bc6\uff0c\u53ef\u6709\u6548\u4fdd\u8b77\u90f5\u4ef6\u5167\u5bb9\u3002\u82e5 587 \u9023\u63a5\u57e0\u7121\u6cd5\u4f7f\u7528\uff0c\u4f60\u53ef\u4ee5\u8003\u616e 465 \u9023\u63a5\u57e0\uff0c\u5b83\u5728\u9023\u7dda\u5efa\u7acb\u4e4b\u521d\u5373\u555f\u7528 SSL \u52a0\u5bc6\u3002\u90e8\u5206\u670d\u52d9\u5546\u4e5f\u6703\u958b\u653e 2525 \u4f5c\u70ba\u5099\u63f4\u9078\u9805\u3002<\/p>\n<ul>\n<li>\n<p>\u9023\u63a5\u57e0 587\uff1a\u5efa\u8b70\u7528\u65bc\u90f5\u4ef6\u63d0\u4ea4\uff0c\u9700\u8eab\u5206\u9a57\u8b49\u4e26\u652f\u63f4 TLS\u3002<\/p>\n<\/li>\n<li>\n<p>\u9023\u63a5\u57e0 465\uff1a\u8f03\u591a\u7528\u65bc\u820a\u7cfb\u7d71\uff0c\u9023\u7dda\u4e00\u958b\u59cb\u5c31\u4f7f\u7528 SSL \u52a0\u5bc6\u3002<\/p>\n<\/li>\n<li>\n<p>\u9023\u63a5\u57e0 2525\uff1a\u5728\u5176\u4ed6\u9023\u63a5\u57e0\u53d7\u9650\u6642\u7684\u4e00\u7a2e\u66ff\u4ee3\u9078\u64c7\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u76ee\u524d\uff0c587 \u9023\u63a5\u57e0\u5e7e\u4e4e\u5df2\u6210\u70ba\u5b89\u5168\u90f5\u4ef6\u63d0\u4ea4\u7684\u9810\u8a2d\u6a19\u6e96\u3002\u4f7f\u7528\u6b64\u9023\u63a5\u57e0\uff0c\u4f60\u4e0d\u50c5\u80fd\u7372\u5f97\u66f4\u5f37\u7684\u5b89\u5168\u6027\u8207\u8eab\u5206\u9a57\u8b49\u6a5f\u5236\uff0c\u4e5f\u80fd\u63d0\u5347\u6574\u9ad4\u6295\u905e\u6210\u529f\u7387\u3002ISP \u5c0d 587 \u9023\u63a5\u57e0\u7684\u614b\u5ea6\u901a\u5e38\u8f03\u53cb\u5584\uff0c\u56e0\u70ba\u5b83\u5728\u6280\u8853\u4e0a\u6709\u52a9\u65bc\u6e1b\u5c11\u5783\u573e\u90f5\u4ef6\uff0c\u4e26\u652f\u63f4\u66f4\u56b4\u8b39\u7684\u52a0\u5bc6\u7b56\u7565\u3002<\/p>\n<p>\u900f\u904e 587 \u8207 465 \u9023\u63a5\u57e0\uff0c\u4f60\u80fd\u6709\u6548\u7e5e\u904e ISP \u5c0d 25 \u9023\u63a5\u57e0\u7684\u9650\u5236\uff0c\u540c\u6642\u5229\u7528 TLS \u7b49\u52a0\u5bc6\u5354\u5b9a\u4fdd\u8b77\u8cc7\u6599\u4e26\u512a\u5316\u90f5\u4ef6\u6295\u905e\u3002<\/p>\n<h3>\u4f7f\u7528\u5177\u8eab\u5206\u9a57\u8b49\u7684\u90f5\u4ef6\u670d\u52d9<\/h3>\n<p>\u85c9\u7531\u5177\u8eab\u5206\u9a57\u8b49\u7684 SMTP \u670d\u52d9\uff0c\u4f60\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u90f5\u4ef6\u5b89\u5168\u6027\u300225 \u9023\u63a5\u57e0\u65e2\u4e0d\u5f37\u5236\u8eab\u5206\u9a57\u8b49\uff0c\u4e5f\u4e0d\u5f37\u5236\u52a0\u5bc6\uff0c\u56e0\u6b64\u975e\u5e38\u5bb9\u6613\u906d\u5230\u6feb\u7528\u3002\u800c\u7576\u4f60\u4f7f\u7528 587 \u6216 465 \u7b49\u9023\u63a5\u57e0\u6642\uff0c\u901a\u5e38\u9700\u8981\u63d0\u4f9b\u4f7f\u7528\u8005\u540d\u7a31\u8207\u5bc6\u78bc\u4ee5\u5b8c\u6210\u8eab\u5206\u9a57\u8b49\uff0c\u78ba\u4fdd\u53ea\u6709\u6388\u6b0a\u7528\u6236\u80fd\u5bc4\u9001\u90f5\u4ef6\u3002<\/p>\n<ul>\n<li>\n<p>587 \u9023\u63a5\u57e0\u9700\u8981\u8eab\u5206\u9a57\u8b49\uff0c\u4e26\u652f\u63f4 TLS \u52a0\u5bc6\u3002<\/p>\n<\/li>\n<li>\n<p>465 \u9023\u63a5\u57e0\u5728\u6703\u8a71\u4e00\u958b\u59cb\u5c31\u555f\u7528 SSL \u52a0\u5bc6\uff0c\u53ef\u907f\u514d\u964d\u7d1a\u653b\u64ca\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6b64\u5916\uff0c\u4f60\u4e5f\u80fd\u7372\u5f97\u66f4\u4f73\u7684\u6295\u905e\u8868\u73fe\u3002\u90f5\u4ef6\u670d\u52d9\u5546\u901a\u5e38\u6703\u5c07\u5177\u8eab\u5206\u9a57\u8b49\u7684\u6d41\u91cf\u8996\u70ba\u300c\u53ef\u4fe1\u767c\u4fe1\u4f86\u6e90\u300d\uff0c\u8f03\u4e0d\u5bb9\u6613\u5c07\u5176\u8aa4\u5224\u70ba\u5783\u573e\u90f5\u4ef6\u3002\u5982\u6b64\u4e00\u4f86\uff0c\u4f60\u65e2\u80fd\u63d0\u9ad8\u5b89\u5168\u6027\uff0c\u53c8\u80fd\u964d\u4f4e\u88ab\u5783\u573e\u90f5\u4ef6\u904e\u6ffe\u5668\u6514\u622a\u7684\u6a5f\u7387\u3002<\/p>\n<h3>\u806f\u7d61 ISP \u7533\u8acb\u9023\u63a5\u57e0\u5b58\u53d6\u6b0a<\/h3>\n<p>\u82e5\u4f60\u78ba\u5be6\u56e0\u7279\u6b8a\u9700\u6c42\u5fc5\u9808\u4f7f\u7528 25 \u9023\u63a5\u57e0\uff0c\u53ef\u4ee5\u5617\u8a66\u806f\u7d61 ISP \u7533\u8acb\u4f8b\u5916\u958b\u653e\u3002\u6709\u4e9b ISP \u6703\u91dd\u5c0d\u4f01\u696d\u5e33\u6236\u6216\u66f4\u9ad8\u968e\u65b9\u6848\u63d0\u4f9b\u89e3\u5c01\u670d\u52d9\uff0c\u4f60\u9700\u8981\u67e5\u770b\u5176\u76f8\u95dc\u653f\u7b56\u4e26\u4f9d\u6d41\u7a0b\u63d0\u51fa\u7533\u8acb\u3002<\/p>\n<ul>\n<li>\n<p>\u767b\u5165 ISP \u63d0\u4f9b\u7684\u7528\u6236\u7ba1\u7406\u6216\u670d\u52d9\u5165\u53e3\u7db2\u7ad9\uff0c\u627e\u5230\u81ea\u52a9\u8a3a\u65b7\u6216\u5ba2\u670d\u5de5\u55ae\u5165\u53e3\u3002<\/p>\n<\/li>\n<li>\n<p>\u57f7\u884c\u76f8\u95dc\u8a3a\u65b7\uff0c\u6216\u63d0\u4ea4\u5de5\u55ae\uff0c\u7533\u8acb\u5728\u7279\u5b9a\u689d\u4ef6\u4e0b\u8c41\u514d 25 \u9023\u63a5\u57e0\u5c01\u9396\u3002<\/p>\n<\/li>\n<li>\n<p>\u591a\u6578 ISP \u6703\u5c01\u9396\u9664\u5176\u5b98\u65b9 SMTP \u4f3a\u670d\u5668\u4ee5\u5916\u7684\u6240\u6709\u5c0d\u5916 25 \u9023\u63a5\u57e0\u9023\u7dda\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u4ee5\u5148\u5728\u4f3a\u670d\u5668\u4e0a\u57f7\u884c\u985e\u4f3c <code>telnet &lt;remote MX&gt; 25<\/code> \u7684\u6307\u4ee4\u9032\u884c\u6aa2\u6e2c\u3002\u82e5\u78ba\u5b9a\u662f 25 \u9023\u63a5\u57e0\u906d\u5c01\u9396\uff0c\u53ef\u8207 ISP \u8a0e\u8ad6\u662f\u5426\u6709\u89e3\u5c01\u9078\u9805\uff0c\u6216\u8005\u6539\u5728 587 \u9023\u63a5\u57e0\u4e0a\u4f7f\u7528 SMTP \u4e2d\u7e7c\u670d\u52d9\u3002\u63a5\u8457\u5728\u4f60\u7684\u90f5\u4ef6\u50b3\u8f38\u4ee3\u7406\uff08MTA\uff09\u4e2d\u914d\u7f6e\u6b63\u78ba\u7684\u4e2d\u7e7c\u8a2d\u5b9a\uff0c\u4e26\u900f\u904e\u9023\u7dda\u6e2c\u8a66\u5de5\u5177\u9a57\u8b49\u90f5\u4ef6\u662f\u5426\u80fd\u6b63\u5e38\u6295\u905e\u3002<\/p>\n<p>\u76ee\u524d\uff0c587 \u9023\u63a5\u57e0\u5df2\u88ab\u5ee3\u6cdb\u8a8d\u53ef\u70ba\u90f5\u4ef6\u63d0\u4ea4\u7684\u5b98\u65b9\u6a19\u6e96\u9023\u63a5\u57e0\u3002\u5b83\u7372\u5f97\u4e3b\u6d41\u670d\u52d9\u5546\u666e\u904d\u652f\u63f4\uff0c\u4e5f\u8f03\u4e0d\u5bb9\u6613\u88ab\u5c01\u9396\uff0c\u56e0\u6b64\u5c0d\u591a\u6578\u4f7f\u7528\u8005\u800c\u8a00\u662f\u6700\u4f73\u9078\u64c7\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 \u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\uff0c\u4e3b\u8981\u662f\u51fa\u65bc\u5b89\u5168\u8003\u91cf\u3002\u9019\u80fd\u4fdd\u8b77\u5e73\u53f0\u3001\u9810\u9632\u6feb\u7528\uff0c\u4e26\u7b26\u5408\u6574\u9ad4\u7522\u696d\u8da8\u52e2\u8207\u6a19\u6e96\u3002<\/p>\n<ul>\n<li>\n<p>ISP \u5e0c\u671b\u70ba\u4f60\u8207\u5176\u4ed6\u7528\u6236\u7dad\u6301\u66f4\u5b89\u5168\u7684\u7db2\u8def\u74b0\u5883\u3002<\/p>\n<\/li>\n<li>\n<p>\u5c01\u9396 25 \u9023\u63a5\u57e0\u6709\u52a9\u65bc\u963b\u65b7\u5783\u573e\u90f5\u4ef6\uff0c\u7dad\u8b77\u4f60\u7684\u90f5\u4ef6\u4fe1\u8b7d\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u642d\u914d\u4f7f\u7528 SPF\u3001DKIM \u548c DMARC 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\u9023\u63a5\u57e0\u5bc4\u9001\u90f5\u4ef6\u3002\u6b64\u9023\u63a5\u57e0\u652f\u63f4\u8eab\u5206\u9a57\u8b49\u8207\u52a0\u5bc6\uff0c\u65e2\u80fd\u78ba\u4fdd\u90f5\u4ef6\u5167\u5bb9\u5b89\u5168\uff0c\u4e5f\u80fd\u63d0\u5347\u6574\u9ad4\u6295\u905e\u6210\u529f\u7387\u3002<\/p>\n<h3>\u5982\u4f55\u5224\u65b7\u6211\u7684 ISP \u662f\u5426\u5c01\u9396\u4e86 25 \u9023\u63a5\u57e0\uff1f<\/h3>\n<p>\u4f60\u53ef\u4ee5\u5728\u7d42\u7aef\u6a5f\u4e2d\u57f7\u884c\u4ee5\u4e0b\u6307\u4ee4\u4f86\u6e2c\u8a66 25 \u9023\u63a5\u57e0\u7684\u9023\u901a\u6027\uff1a<\/p>\n<pre><code>telnet smtp.example.com 25\r\n<\/code><\/pre>\n<p>\u82e5\u51fa\u73fe\u9023\u7dda\u903e\u6642\u6216\u9023\u7dda\u88ab\u62d2\u7d55\u7684\u8a0a\u606f\uff0c\u5c31\u8868\u793a ISP \u5f88\u53ef\u80fd\u5df2\u5c01\u9396\u8a72\u9023\u63a5\u57e0\u3002<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4f60\u53ef\u80fd\u6703\u767c\u73fe\uff0c\u5f9e\u5bb6\u7528\u7db2\u8def\u5bc4\u9001\u90f5\u4ef6\u6709\u6642\u6703\u5931\u6557\u3002\u591a\u6578 ISP \u6703\u5c01\u9396 SMTP \u9023\u63a5\u57e0 25\uff0c\u4ee5\u963b\u6b62\u5783\u573e\u90f5\u4ef6\u4e26\u4fdd\u8b77 [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":11,"featured_media":32676,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[267],"tags":[],"class_list":["post-32679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-tc"],"acf":[],"yoast_head":"<!-- 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\u5c01\u9396 SMTP 25 \u9023\u63a5\u57e0\u5c0d\u90f5\u4ef6\u6295\u905e\u7684\u5f71\u97ff\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-isp-blocking-of-smtp-port-25-impacts-email-delivery\/\" \/>\n<meta property=\"og:site_name\" content=\"Varidata Limited\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-21T07:19:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-21T07:21:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.varidata.com\/wp-content\/uploads\/2026\/05\/\u5c4f\u5e55\u622a\u56fe-2026-05-21-095030.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"686\" \/>\n\t<meta property=\"og:image:height\" content=\"389\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<script type=\"application\/ld+json\" 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