{"id":477385,"date":"2023-08-09T09:12:24","date_gmt":"2023-08-09T09:12:24","guid":{"rendered":""},"modified":"2023-09-05T11:14:38","modified_gmt":"2023-09-05T11:14:38","slug":"greylist","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/greylist\/","title":{"rendered":"Danh s\u00e1ch x\u00e1m"},"content":{"rendered":"<p>Greylist l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p c\u00f3 hi\u1ec7u qu\u1ea3 cao v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i trong th\u1ebf gi\u1edbi m\u00e1y ch\u1ee7 proxy \u0111\u1ec3 ch\u1ed1ng th\u01b0 r\u00e1c, ng\u0103n ch\u1eb7n l\u1ea1m d\u1ee5ng v\u00e0 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt. N\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t b\u1ed9 l\u1ecdc trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, qu\u1ea3n l\u00fd c\u00e1c k\u1ebft n\u1ed1i \u0111\u1ebfn b\u1eb1ng c\u00e1ch t\u1ea1m th\u1eddi tr\u00ec ho\u00e3n c\u00e1c y\u00eau c\u1ea7u kh\u00f4ng x\u00e1c \u0111\u1ecbnh ho\u1eb7c \u0111\u00e1ng ng\u1edd. Kh\u00f4ng gi\u1ed1ng nh\u01b0 danh s\u00e1ch \u0111en, t\u1eeb ch\u1ed1i quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c th\u1ef1c th\u1ec3 \u0111\u1ed9c h\u1ea1i \u0111\u00e3 bi\u1ebft v\u00e0 danh s\u00e1ch tr\u1eafng, c\u1ea5p quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c ngu\u1ed3n \u0111\u00e1ng tin c\u1eady, danh s\u00e1ch x\u00e1m c\u00f3 c\u00e1ch ti\u1ebfp c\u1eadn th\u1eadn tr\u1ecdng h\u01a1n. H\u1ecd t\u1ea1m th\u1eddi tr\u00ec ho\u00e3n quy\u1ebft \u0111\u1ecbnh ch\u1ea5p nh\u1eadn hay t\u1eeb ch\u1ed1i y\u00eau c\u1ea7u, cho ph\u00e9p c\u00e1c ngu\u1ed3n h\u1ee3p ph\u00e1p t\u1ef1 \u0111\u1ed9ng th\u1eed l\u1ea1i v\u00e0 chuy\u1ec3n qua.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a Greylist v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean c\u1ee7a n\u00f3<\/h2>\n<p>Kh\u00e1i ni\u1ec7m danh s\u00e1ch x\u00e1m b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u nh\u1eefng n\u0103m 2000 nh\u01b0 m\u1ed9t c\u00e1ch s\u00e1ng t\u1ea1o \u0111\u1ec3 gi\u1ea3m th\u01b0 r\u00e1c trong h\u1ec7 th\u1ed1ng email. Evan Harris l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 xu\u1ea5t \u00fd t\u01b0\u1edfng n\u00e0y v\u00e0o n\u0103m 2003 v\u00e0 sau \u0111\u00f3 n\u00f3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n th\u00e0nh m\u1ed9t k\u1ef9 thu\u1eadt ho\u00e0n ch\u1ec9nh b\u1edfi Alan Schwartz, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 S\u1ef1 bi\u1ebfn \u0111\u1ed5i Schwartzian. Tr\u1ecdng t\u00e2m ban \u0111\u1ea7u l\u00e0 m\u00e1y ch\u1ee7 email, nh\u01b0ng \u00fd t\u01b0\u1edfng \u0111\u01b0a danh s\u00e1ch x\u00e1m nhanh ch\u00f3ng lan sang c\u00e1c l\u0129nh v\u1ef1c kh\u00e1c, bao g\u1ed3m c\u1ea3 proxy web v\u00e0 m\u1ea1ng.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Greylist<\/h2>\n<p>Greylist s\u1eed d\u1ee5ng m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u01a1n gi\u1ea3n nh\u01b0ng hi\u1ec7u qu\u1ea3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i \u0111e d\u1ecda ti\u1ec1m \u1ea9n ho\u1eb7c c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c h\u1ea1i. Khi m\u00e1y kh\u00e1ch \u0111\u01b0a ra y\u00eau c\u1ea7u t\u1edbi m\u00e1y ch\u1ee7, m\u00e1y ch\u1ee7 danh s\u00e1ch x\u00e1m s\u1ebd ph\u1ea3n h\u1ed3i b\u1eb1ng t\u1eeb ch\u1ed1i t\u1ea1m th\u1eddi \u201cm\u1ec1m\u201d, cho bi\u1ebft r\u1eb1ng y\u00eau c\u1ea7u \u0111\u00f3 t\u1ea1m th\u1eddi b\u1ecb tr\u00ec ho\u00e3n. Ph\u1ea3n h\u1ed3i n\u00e0y khi\u1ebfn h\u1ea7u h\u1ebft nh\u1eefng ng\u01b0\u1eddi g\u1eedi th\u01b0 r\u00e1c ti\u1ebfp t\u1ee5c m\u00e0 kh\u00f4ng c\u1ea7n th\u1eed l\u1ea1i. M\u1eb7t kh\u00e1c, c\u00e1c m\u00e1y ch\u1ee7 h\u1ee3p ph\u00e1p th\u01b0\u1eddng s\u1ebd g\u1eedi l\u1ea1i y\u00eau c\u1ea7u sau m\u1ed9t kho\u1ea3ng th\u1eddi gian tr\u1ec5 ng\u1eafn, theo h\u00e0nh vi c\u1ee7a m\u00e1y ch\u1ee7 email ti\u00eau chu\u1ea9n.<\/p>\n<p>Khi nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u th\u1ee9 hai, m\u00e1y ch\u1ee7 danh s\u00e1ch x\u00e1m s\u1ebd x\u00e1c minh xem kho\u1ea3ng th\u1eddi gian gi\u1eefa y\u00eau c\u1ea7u ban \u0111\u1ea7u v\u00e0 y\u00eau c\u1ea7u hi\u1ec7n t\u1ea1i \u0111\u00e3 tr\u00f4i qua \u0111\u1ee7 ch\u01b0a. N\u1ebfu \u0111\u1ed9 tr\u1ec5 \u0111\u01b0\u1ee3c coi l\u00e0 c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c th\u00ec y\u00eau c\u1ea7u s\u1ebd \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o danh s\u00e1ch cho ph\u00e9p v\u00e0 c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo t\u1eeb c\u00f9ng m\u1ed9t ngu\u1ed3n s\u1ebd t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn m\u00e0 kh\u00f4ng b\u1ecb ch\u1eadm tr\u1ec5 th\u00eam.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Greylist v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a danh s\u00e1ch x\u00e1m t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n, ch\u1ee7 y\u1ebfu bao g\u1ed3m ba th\u00e0nh ph\u1ea7n:<\/p>\n<ol>\n<li>\n<p><strong>\u0110\u1ecba ch\u1ec9 IP c\u1ee7a kh\u00e1ch h\u00e0ng<\/strong>: \u0110i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n g\u1ed1c c\u1ee7a y\u00eau c\u1ea7u g\u1eedi \u0111\u1ebfn, y\u00eau c\u1ea7u n\u00e0y s\u1ebd t\u1ea1m th\u1eddi b\u1ecb tr\u00ec ho\u00e3n.<\/p>\n<\/li>\n<li>\n<p><strong>D\u1ea5u th\u1eddi gian<\/strong>: Ghi l\u1ea1i th\u1eddi gian ch\u00ednh x\u00e1c khi nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ban \u0111\u1ea7u \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u1ed9 tr\u1ec5 gi\u1eefa c\u00e1c l\u1ea7n th\u1eed l\u1ea1i.<\/p>\n<\/li>\n<li>\n<p><strong>Th\u1eddi gian h\u1ebft h\u1ea1n<\/strong>: \u0110\u1eb7t kho\u1ea3ng th\u1eddi gian c\u1ee5 th\u1ec3 trong \u0111\u00f3 m\u1ee5c danh s\u00e1ch x\u00e1m v\u1eabn ho\u1ea1t \u0111\u1ed9ng tr\u01b0\u1edbc khi h\u1ebft h\u1ea1n.<\/p>\n<\/li>\n<\/ol>\n<p>M\u00e1y ch\u1ee7 danh s\u00e1ch x\u00e1m ki\u1ec3m tra t\u1eebng y\u00eau c\u1ea7u \u0111\u1ebfn d\u1ef1a tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a n\u00f3, ch\u1ee9a \u0111\u1ecba ch\u1ec9 IP, d\u1ea5u th\u1eddi gian v\u00e0 th\u1eddi gian h\u1ebft h\u1ea1n c\u1ee7a kh\u00e1ch h\u00e0ng. N\u1ebfu y\u00eau c\u1ea7u kh\u1edbp v\u1edbi m\u1ee5c nh\u1eadp hi\u1ec7n c\u00f3 v\u00e0 n\u1eb1m trong khung th\u1eddi gian \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh th\u00ec y\u00eau c\u1ea7u \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c ch\u1ea5p thu\u1eadn. N\u1ebfu kh\u00f4ng, m\u00e1y ch\u1ee7 s\u1ebd th\u00eam m\u1ee5c m\u1edbi v\u00e0o danh s\u00e1ch x\u00e1m, tr\u00ec ho\u00e3n quy\u1ebft \u0111\u1ecbnh cho \u0111\u1ebfn khi qu\u00e1 tr\u00ecnh th\u1eed l\u1ea1i di\u1ec5n ra.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Greylist<\/h2>\n<p>Greylist cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh g\u00f3p ph\u1ea7n n\u00e2ng cao hi\u1ec7u qu\u1ea3 v\u00e0 \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i:<\/p>\n<ol>\n<li>\n<p><strong>Gi\u1ea3m th\u01b0 r\u00e1c<\/strong>: Danh s\u00e1ch x\u00e1m gi\u1ea3m \u0111\u00e1ng k\u1ec3 th\u01b0 r\u00e1c v\u00e0 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp kh\u00f4ng mong mu\u1ed1n b\u1eb1ng c\u00e1ch khi\u1ebfn h\u1ea7u h\u1ebft nh\u1eefng k\u1ebb g\u1eedi th\u01b0 r\u00e1c chuy\u1ec3n sang c\u00e1c m\u1ee5c ti\u00eau kh\u00e1c sau khi nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 t\u1eeb ch\u1ed1i t\u1ea1m th\u1eddi.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ea3o t\u1ed3n t\u00e0i nguy\u00ean<\/strong>: B\u1eb1ng c\u00e1ch tr\u00ec ho\u00e3n c\u00e1c y\u00eau c\u1ea7u t\u1eeb c\u00e1c ngu\u1ed3n ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c minh, m\u00e1y ch\u1ee7 danh s\u00e1ch x\u00e1m s\u1ebd ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng, gi\u1ea3m t\u1ea3i cho c\u00e1c m\u00e1y ch\u1ee7 ph\u1ee5 tr\u1ee3.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u1ea3n l\u00fd t\u1ef1 \u0111\u1ed9ng<\/strong>: C\u00e1c m\u1ee5c trong danh s\u00e1ch x\u00e1m \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd t\u1ef1 \u0111\u1ed9ng d\u1ef1a tr\u00ean d\u1ea5u th\u1eddi gian v\u00e0 th\u1eddi gian h\u1ebft h\u1ea1n, gi\u1ea3m nhu c\u1ea7u can thi\u1ec7p th\u1ee7 c\u00f4ng.<\/p>\n<\/li>\n<li>\n<p><strong>T\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt<\/strong>: Danh s\u00e1ch x\u00e1m b\u1ed5 sung th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt, b\u1ea3o v\u1ec7 kh\u1ecfi c\u00e1c m\u1ed1i \u0111e d\u1ecda kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDoS v\u00e0 c\u00e1c n\u1ed7 l\u1ef1c b\u1ea1o l\u1ef1c.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00e1c \u0111\u1ed9ng ng\u01b0\u1eddi d\u00f9ng t\u1ed1i thi\u1ec3u<\/strong>: Kh\u00e1ch h\u00e0ng h\u1ee3p ph\u00e1p \u00edt g\u1eb7p ph\u1ea3i s\u1ef1 b\u1ea5t ti\u1ec7n nh\u1ea5t v\u00ec h\u1ecd t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o danh s\u00e1ch tr\u1eafng sau m\u1ed9t th\u1eddi gian tr\u00ec ho\u00e3n ng\u1eafn.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i danh s\u00e1ch x\u00e1m<\/h2>\n<p>Vi\u1ec7c tri\u1ec3n khai Greylist c\u00f3 th\u1ec3 kh\u00e1c nhau v\u1ec1 c\u00e1ch ti\u1ebfp c\u1eadn v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i danh s\u00e1ch x\u00e1m ph\u1ed5 bi\u1ebfn:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Danh s\u00e1ch x\u00e1m \u0111\u01a1n gi\u1ea3n<\/td>\n<td>H\u00ecnh th\u1ee9c \u0111\u01b0a v\u00e0o danh s\u00e1ch x\u00e1m c\u01a1 b\u1ea3n ch\u1ec9 d\u1ef1a v\u00e0o vi\u1ec7c tr\u00ec ho\u00e3n c\u00e1c y\u00eau c\u1ea7u kh\u00f4ng x\u00e1c \u0111\u1ecbnh trong m\u1ed9t th\u1eddi gian c\u1ee5 th\u1ec3.<\/td>\n<\/tr>\n<tr>\n<td>Danh s\u00e1ch x\u00e1m th\u00edch \u1ee9ng<\/td>\n<td>S\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh h\u00e0nh vi \u0111\u01b0a v\u00e0o danh s\u00e1ch x\u00e1m d\u1ef1a tr\u00ean c\u00e1c m\u1eabu m\u1ea1ng.<\/td>\n<\/tr>\n<tr>\n<td>Danh s\u00e1ch x\u00e1m SMTP<\/td>\n<td>\u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho c\u00e1c m\u00e1y ch\u1ee7 email nh\u1eb1m ch\u1ed1ng th\u01b0 r\u00e1c b\u1eb1ng c\u00e1ch tr\u00ec ho\u00e3n vi\u1ec7c g\u1eedi email c\u1ee7a nh\u1eefng ng\u01b0\u1eddi g\u1eedi kh\u00f4ng x\u00e1c \u0111\u1ecbnh.<\/td>\n<\/tr>\n<tr>\n<td>Danh s\u00e1ch x\u00e1m proxy web<\/td>\n<td>\u0110\u01b0\u1ee3c tri\u1ec3n khai tr\u00ean c\u00e1c m\u00e1y ch\u1ee7 proxy web \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c l\u1ea1m d\u1ee5ng v\u00e0 qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i m\u00e1y kh\u00e1ch-m\u00e1y ch\u1ee7 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Greylist, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>Greylist t\u00ecm th\u1ea5y \u1ee9ng d\u1ee5ng trong nhi\u1ec1u t\u00ecnh hu\u1ed1ng kh\u00e1c nhau v\u00e0 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee7a n\u00f3 bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>L\u1ecdc email<\/strong>: Danh s\u00e1ch x\u00e1m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 gi\u1ea3m th\u01b0 r\u00e1c trong m\u00e1y ch\u1ee7 email, ng\u0103n ch\u1eb7n c\u00e1c email kh\u00f4ng mong mu\u1ed1n ti\u1ebfp c\u1eadn h\u1ed9p th\u01b0 \u0111\u1ebfn c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u1ea3n l\u00fd proxy web<\/strong>: M\u00e1y ch\u1ee7 proxy web s\u1eed d\u1ee5ng danh s\u00e1ch x\u00e1m \u0111\u1ec3 ki\u1ec3m so\u00e1t c\u00e1c k\u1ebft n\u1ed1i m\u00e1y kh\u00e1ch-m\u00e1y ch\u1ee7, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t v\u00e0 b\u1ea3o m\u1eadt t\u1ed1i \u01b0u.<\/p>\n<\/li>\n<li>\n<p><strong>Gi\u1ea3m thi\u1ec3u DDoS<\/strong>: Danh s\u00e1ch x\u00e1m c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m thi\u1ec3u c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 ph\u00e2n t\u00e1n (DDoS) b\u1eb1ng c\u00e1ch tr\u00ec ho\u00e3n c\u00e1c y\u00eau c\u1ea7u \u0111\u00e1ng ng\u1edd v\u00e0 l\u1ecdc ra l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ed9c h\u1ea1i.<\/p>\n<\/li>\n<\/ol>\n<p>M\u1eb7c d\u00f9 c\u00f3 hi\u1ec7u qu\u1ea3 nh\u01b0ng vi\u1ec7c \u0111\u01b0a v\u00e0o danh s\u00e1ch x\u00e1m c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c, bao g\u1ed3m:<\/p>\n<ul>\n<li>\n<p><strong>T\u00edch c\u1ef1c sai<\/strong>: C\u00e1c m\u00e1y ch\u1ee7 h\u1ee3p ph\u00e1p \u0111\u00f4i khi c\u00f3 th\u1ec3 b\u1ecb t\u1ea1m th\u1eddi t\u1eeb ch\u1ed1i, d\u1eabn \u0111\u1ebfn vi\u1ec7c li\u00ean l\u1ea1c b\u1ecb ch\u1eadm tr\u1ec5 m\u1ed9t ch\u00fat. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh th\u1eddi gian h\u1ebft h\u1ea1n ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt danh s\u00e1ch x\u00e1m th\u00edch \u1ee9ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ngu\u1ed3n l\u1ef1c chuy\u00ean s\u00e2u<\/strong>: Trong m\u00f4i tr\u01b0\u1eddng c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao, vi\u1ec7c qu\u1ea3n l\u00fd danh s\u00e1ch x\u00e1m l\u1edbn c\u00f3 th\u1ec3 ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng \u0111\u00e1ng k\u1ec3. Vi\u1ec7c s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 v\u00e0 m\u1edf r\u1ed9ng quy m\u00f4 ph\u1ea7n c\u1ee9ng c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh Greylist v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<th>S\u1ef1 kh\u00e1c bi\u1ec7t so v\u1edbi Greylist<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Danh s\u00e1ch \u0111en<\/td>\n<td>T\u1eeb ch\u1ed1i quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c th\u1ef1c th\u1ec3 \u0111\u1ed9c h\u1ea1i \u0111\u00e3 bi\u1ebft<\/td>\n<td>Greylist tr\u00ec ho\u00e3n quy\u1ebft \u0111\u1ecbnh ch\u1ea5p nh\u1eadn\/t\u1eeb ch\u1ed1i<\/td>\n<\/tr>\n<tr>\n<td>Danh s\u00e1ch tr\u1eafng<\/td>\n<td>C\u1ea5p quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c ngu\u1ed3n \u0111\u00e1ng tin c\u1eady<\/td>\n<td>Greylist tr\u00ec ho\u00e3n quy\u1ebft \u0111\u1ecbnh ch\u1ea5p nh\u1eadn\/t\u1eeb ch\u1ed1i<\/td>\n<\/tr>\n<tr>\n<td>m\u00e3 ng\u1eabu nhi\u00ean<\/td>\n<td>C\u00f4ng c\u1ee5 x\u00e1c minh con ng\u01b0\u1eddi \u0111\u1ec3 ng\u0103n ch\u1eb7n l\u1ea1m d\u1ee5ng t\u1ef1 \u0111\u1ed9ng<\/td>\n<td>Greylist qu\u1ea3n l\u00fd c\u00e1c y\u00eau c\u1ea7u t\u1eeb c\u1ea3 ng\u01b0\u1eddi d\u00f9ng t\u1ef1 \u0111\u1ed9ng v\u00e0 ng\u01b0\u1eddi d\u00f9ng con ng\u01b0\u1eddi<\/td>\n<\/tr>\n<tr>\n<td>SPF (Khung ch\u00ednh s\u00e1ch ng\u01b0\u1eddi g\u1eedi)<\/td>\n<td>Ph\u01b0\u01a1ng th\u1ee9c x\u00e1c th\u1ef1c email \u0111\u1ec3 ng\u0103n ch\u1eb7n gi\u1ea3 m\u1ea1o<\/td>\n<td>Greylist t\u1eadp trung v\u00e0o vi\u1ec7c gi\u1ea3m th\u01b0 r\u00e1c th\u00f4ng qua vi\u1ec7c tr\u00ec ho\u00e3n email<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Greylist<\/h2>\n<p>Trong t\u01b0\u01a1ng lai, danh s\u00e1ch x\u00e1m d\u1ef1 ki\u1ebfn s\u1ebd ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, \u0111\u01b0\u1ee3c th\u00fac \u0111\u1ea9y b\u1edfi nh\u1eefng ti\u1ebfn b\u1ed9 trong h\u1ecdc m\u00e1y v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o. Danh s\u00e1ch x\u00e1m th\u00edch \u1ee9ng s\u1ebd tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n, cung c\u1ea5p c\u00e1c \u0111i\u1ec1u ch\u1ec9nh linh ho\u1ea1t \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Ngo\u00e0i ra, vi\u1ec7c t\u00edch h\u1ee3p li\u1ec1n m\u1ea1ch v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng b\u1ea3o m\u1eadt \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi AI s\u1ebd n\u00e2ng cao kh\u1ea3 n\u0103ng ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c y\u00eau c\u1ea7u th\u1ef1c s\u1ef1 v\u00e0 y\u00eau c\u1ea7u \u0111\u1ed9c h\u1ea1i c\u1ee7a danh s\u00e1ch x\u00e1m.<\/p>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Greylist<\/h2>\n<p>C\u00e1c nh\u00e0 cung c\u1ea5p m\u00e1y ch\u1ee7 proxy nh\u01b0 OneProxy c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng c\u00f4ng ngh\u1ec7 danh s\u00e1ch x\u00e1m \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt v\u00e0 ki\u1ec3m so\u00e1t t\u1ed1t h\u01a1n c\u00e1c k\u1ebft n\u1ed1i m\u00e1y kh\u00e1ch-m\u00e1y ch\u1ee7. B\u1eb1ng c\u00e1ch tri\u1ec3n khai ch\u1ee9c n\u0103ng danh s\u00e1ch x\u00e1m trong c\u00e1c d\u1ecbch v\u1ee5 proxy c\u1ee7a m\u00ecnh, OneProxy c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 nh\u1eefng ngu\u1ed3n h\u1ee3p ph\u00e1p v\u00e0 \u0111\u00e1ng tin c\u1eady m\u1edbi c\u00f3 quy\u1ec1n truy c\u1eadp, gi\u1ea3m thi\u1ec3u r\u1ee7i ro ti\u1ec1m \u1ea9n v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t m\u1ea1ng t\u1ed5ng th\u1ec3.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 Greylist v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Greylisting\" target=\"_new\" rel=\"noopener nofollow\">Danh s\u00e1ch x\u00e1m Wikipedia<\/a><\/li>\n<li><a href=\"http:\/\/www.postfix.org\/GREYLIST_README.html\" target=\"_new\" rel=\"noopener nofollow\">Ph\u00e9p bi\u1ebfn \u0111\u1ed5i Schwartzian<\/a><\/li>\n<li><a href=\"https:\/\/www.spamhaus.org\/whitepapers\/greylisting-explained\/\" target=\"_new\" rel=\"noopener nofollow\">Gi\u1ea3i th\u00edch v\u1ec1 danh s\u00e1ch x\u00e1m \u2013 N\u00f3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o v\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i h\u1eefu \u00edch<\/a><\/li>\n<\/ol>","protected":false},"featured_media":477386,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477385","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Greylist: An In-Depth Look at This Proxy Server Technology<\/mark>","faq_items":[{"question":"What is Greylist and how does it work?","answer":"<p>Greylist is a proxy server technology used to combat spam, enhance security, and manage client-server connections. When a client makes a request, the greylist server responds with a temporary rejection, delaying the decision on acceptance or rejection. Legitimate sources automatically retry, getting whitelisted for future requests, while spammers usually move on.<\/p>"},{"question":"Who proposed the concept of Greylist, and where was it first mentioned?","answer":"<p>The concept of Greylist was proposed by Evan Harris in the early 2000s. It was later developed into a full-fledged technique by Alan Schwartz, also known as The Schwartzian Transform. The initial focus was on email servers to reduce spam.<\/p>"},{"question":"What are the key features of Greylist?","answer":"<p>Greylist offers several key features, including reducing spam, conserving resources, automated management, enhanced security, and minimal user impact.<\/p>"},{"question":"How does Greylist differ from blacklists and whitelists?","answer":"<p>Greylist differs from blacklists and whitelists by temporarily deferring the decision on acceptance or rejection. Blacklists deny access to known malicious entities, while whitelists grant access to trusted sources. Greylists add an extra layer of caution by temporarily delaying unknown or suspicious requests.<\/p>"},{"question":"What types of Greylist exist?","answer":"<p>There are different types of Greylist implementations, including Simple Greylist, Adaptive Greylist, SMTP Greylist (for email servers), and Web Proxy Greylist.<\/p>"},{"question":"What are the ways to use Greylist and what problems might arise?","answer":"<p>Greylist finds applications in email filtering, web proxy management, and DDoS mitigation. However, it may lead to false positives and consume significant resources in high-traffic environments.<\/p>"},{"question":"How can proxy server providers use Greylist?","answer":"<p>Proxy server providers like OneProxy can use Greylist to offer enhanced security and better control over client-server connections. By implementing Greylist functionality, they can ensure that only legitimate and trusted sources gain access, mitigating potential risks and improving network performance.<\/p>"},{"question":"What does the future hold for Greylist technology?","answer":"<p>The future of Greylist is promising, with the potential for advancements in machine learning and AI. Adaptive Greylists will become more prevalent, providing dynamic adjustments to handle sophisticated attacks effectively.<\/p>"},{"question":"Where can I find more information about Greylist?","answer":"<p>For more information about Greylist and its applications, you can refer to resources like Greylisting Wikipedia, The Schwartzian Transform website, and Spamhaus' Greylisting Explained whitepaper.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477385","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477385\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477386"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}