{"id":27867,"date":"2025-05-04T11:57:51","date_gmt":"2025-05-04T04:57:51","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=27867"},"modified":"2026-01-28T11:23:42","modified_gmt":"2026-01-28T04:23:42","slug":"ban-ghi-mx-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/","title":{"rendered":"MX Record L\u00e0 G\u00ec? H\u01b0\u1edbng D\u1eabn C\u1ea5u H\u00ecnh &#038; Ki\u1ec3m Tra Chi Ti\u1ebft 2026"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#MX-Record-la-gi\" >MX Record l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Ban-ghi-MX-Mail-Exchange-hoat-dong-nhu-the-nao\" >B\u1ea3n ghi MX (Mail Exchange) ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cac-thanh-phan-quan-trong-trong-MX-Record\" >C\u00e1c th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong MX Record<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-truc-ky-thuat-cua-mot-ban-ghi-MX\" >C\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt c\u1ee7a m\u1ed9t b\u1ea3n ghi MX<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Priority-Do-uu-tien-trong-MX-Record-la-gi\" >Priority (\u0110\u1ed9 \u01b0u ti\u00ean) trong MX Record l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Time-to-Live-TTL\" >Time to Live (TTL)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#DestinationPoints-to-Dia-chi-dich\" >Destination\/Points to (\u0110\u1ecba ch\u1ec9 \u0111\u00edch)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Huong-dan-cau-hinh-MX-Record-cho-cac-nha-cung-cap-pho-bien\" >H\u01b0\u1edbng d\u1eabn c\u1ea5u h\u00ecnh MX Record cho c\u00e1c nh\u00e0 cung c\u1ea5p ph\u1ed5 bi\u1ebfn<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-hinh-MX-Record-cho-Google-Workspace-Gmail-doanh-nghiep\" >C\u1ea5u h\u00ecnh MX Record cho Google Workspace (Gmail doanh nghi\u1ec7p)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-hinh-MX-Record-cho-Microsoft-365-OutlookExchange-Online\" >C\u1ea5u h\u00ecnh MX Record cho Microsoft 365 (Outlook\/Exchange Online)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-hinh-MX-Record-cho-Zoho-Mail\" >C\u1ea5u h\u00ecnh MX Record cho Zoho Mail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-hinh-tren-cPanel-Cloudflare\" >C\u1ea5u h\u00ecnh tr\u00ean cPanel \/ Cloudflare<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cach-kiem-tra-va-khac-phuc-su-co-MX-Record\" >C\u00e1ch ki\u1ec3m tra v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 MX Record<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Tai-sao-email-van-khong-hoat-dong-sau-khi-cau-hinh\" >T\u1ea1i sao email v\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng sau khi c\u1ea5u h\u00ecnh?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cong-cu-kiem-tra-MX-Record-MX-Lookup-Tools\" >C\u00f4ng c\u1ee5 ki\u1ec3m tra MX Record (MX Lookup Tools)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Thoi-gian-lan-truyen-DNS-Propagation-Time\" >Th\u1eddi gian lan truy\u1ec1n DNS (Propagation Time)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cac-loi-thuong-gap-Common-Mistakes\" >C\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p (Common Mistakes)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#MX-Record-va-Bao-mat-Email\" >MX Record v\u00e0 B\u1ea3o m\u1eadt Email<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Moi-quan-he-giua-MX-Record-SPF-DKIM-va-DMARC\" >M\u1ed1i quan h\u1ec7 gi\u1eefa MX Record, SPF, DKIM v\u00e0 DMARC<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Cau-hoi-thuong-gap-FAQs\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#1-Toi-co-the-co-nhieu-ban-ghi-MX-cho-mot-ten-mien-khong\" >1. T\u00f4i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u b\u1ea3n ghi MX cho m\u1ed9t t\u00ean mi\u1ec1n kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#2-MX-Record-tro-ve-dia-chi-IP-duoc-khong\" >2. MX Record tr\u1ecf v\u1ec1 \u0111\u1ecba ch\u1ec9 IP \u0111\u01b0\u1ee3c kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#3-Thay-doi-MX-Record-mat-bao-lau-de-co-hieu-luc\" >3. Thay \u0111\u1ed5i MX Record m\u1ea5t bao l\u00e2u \u0111\u1ec3 c\u00f3 hi\u1ec7u l\u1ef1c?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#4-Su-khac-biet-giua-A-Record-va-MX-Record-la-gi\" >4. S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa A Record v\u00e0 MX Record l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#5-Neu-xoa-MX-Record-thi-chuyen-gi-xay-ra\" >5. N\u1ebfu x\u00f3a MX Record th\u00ec chuy\u1ec7n g\u00ec x\u1ea3y ra?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/interdata.vn\/blog\/ban-ghi-mx-la-gi\/#Loi-ket\" >L\u1eddi k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n<p>B\u1ea1n g\u1eedi email quan tr\u1ecdng cho \u0111\u1ed1i t\u00e1c nh\u01b0ng h\u1ecd kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c. H\u1ec7 th\u1ed1ng tr\u1ea3 l\u1ea1i th\u01b0 v\u1edbi th\u00f4ng b\u00e1o l\u1ed7i kh\u00f3 hi\u1ec3u. Kh\u00e1ch h\u00e0ng ph\u00e0n n\u00e0n r\u1eb1ng h\u1ecd g\u1eedi th\u01b0 cho b\u1ea1n nh\u01b0ng kh\u00f4ng th\u1ea5y ph\u1ea3n h\u1ed3i.<\/p>\n<p>Nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 c\u1ee7a nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y th\u01b0\u1eddng n\u1eb1m \u1edf c\u1ea5u h\u00ecnh DNS, c\u1ee5 th\u1ec3 l\u00e0 MX Record. Trong h\u1ec7 th\u1ed1ng v\u1eadn h\u00e0nh doanh nghi\u1ec7p, email \u0111\u00f3ng vai tr\u00f2 huy\u1ebft m\u1ea1ch. M\u1ed9t c\u1ea5u h\u00ecnh sai l\u1ec7ch nh\u1ecf c\u0169ng c\u00f3 th\u1ec3 l\u00e0m gi\u00e1n \u0111o\u1ea1n to\u00e0n b\u1ed9 lu\u1ed3ng giao ti\u1ebfp.<\/p>\n<p>B\u00e0i vi\u1ebft n\u00e0y t\u1eeb <strong>InterData<\/strong> s\u1ebd cung c\u1ea5p ki\u1ebfn th\u1ee9c to\u00e0n di\u1ec7n v\u1ec1 MX Record. Ch\u00fang t\u00f4i s\u1ebd \u0111i s\u00e2u v\u00e0o \u0111\u1ecbnh ngh\u0129a, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng v\u00e0 quan tr\u1ecdng nh\u1ea5t l\u00e0 h\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 c\u1ea5u h\u00ecnh ch\u00ednh x\u00e1c cho c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ed5 bi\u1ebfn nh\u01b0 Google Workspace hay Microsoft 365.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"MX-Record-la-gi\"><\/span>MX Record l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Ban-ghi-MX-Mail-Exchange-hoat-dong-nhu-the-nao\"><\/span>B\u1ea3n ghi MX (Mail Exchange) ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MX Record, vi\u1ebft t\u1eaft c\u1ee7a Mail Exchange Record, l\u00e0 m\u1ed9t lo\u1ea1i b\u1ea3n ghi t\u00e0i nguy\u00ean trong H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS). B\u1ea3n ghi n\u00e0y \u0111\u00f3ng vai tr\u00f2 ch\u1ec9 \u0111\u01b0\u1eddng, x\u00e1c \u0111\u1ecbnh m\u00e1y ch\u1ee7 mail n\u00e0o ch\u1ecbu tr\u00e1ch nhi\u1ec7m ti\u1ebfp nh\u1eadn email cho m\u1ed9t t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3.<\/p>\n<p>H\u00e3y h\u00ecnh dung t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n gi\u1ed1ng nh\u01b0 m\u1ed9t t\u00f2a nh\u00e0 v\u0103n ph\u00f2ng l\u1edbn. Trong t\u00f2a nh\u00e0 \u0111\u00f3 c\u00f3 nhi\u1ec1u ph\u00f2ng ban kh\u00e1c nhau nh\u01b0 ph\u00f2ng Website (A Record), ph\u00f2ng T\u00e0i li\u1ec7u (TXT Record). MX Record ch\u00ednh l\u00e0 b\u1ed9 ph\u1eadn l\u1ec5 t\u00e2n chuy\u00ean nh\u1eadn b\u01b0u ph\u1ea9m.<\/p>\n<p>Khi b\u01b0u t\u00e1 (m\u00e1y ch\u1ee7 g\u1eedi th\u01b0) \u0111\u1ebfn t\u00f2a nh\u00e0, b\u1ed9 ph\u1eadn l\u1ec5 t\u00e2n (MX Record) s\u1ebd ch\u1ec9 d\u1eabn b\u01b0u t\u00e1 \u0111\u01b0a th\u01b0 \u0111\u1ebfn \u0111\u00fang b\u00e0n l\u00e0m vi\u1ec7c c\u1ee7a ng\u01b0\u1eddi nh\u1eadn. N\u1ebfu kh\u00f4ng c\u00f3 b\u1ed9 ph\u1eadn l\u1ec5 t\u00e2n n\u00e0y, b\u01b0u t\u00e1 s\u1ebd kh\u00f4ng bi\u1ebft giao th\u01b0 cho ai v\u00e0 bu\u1ed9c ph\u1ea3i tr\u1ea3 l\u1ea1i b\u01b0u ph\u1ea9m v\u1ec1 n\u01a1i g\u1eedi.<\/p>\n<figure id=\"attachment_38651\" aria-describedby=\"caption-attachment-38651\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38651\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/MX-Record-1.webp\" alt=\"MX Record\" width=\"750\" height=\"409\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/MX-Record-1.webp 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/MX-Record-1-300x164.webp 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-38651\" class=\"wp-caption-text\">MX Record<\/figcaption><\/figure>\n<h4>C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng t\u1eebng b\u01b0\u1edbc<\/h4>\n<p>Quy tr\u00ecnh g\u1eedi v\u00e0 nh\u1eadn email di\u1ec5n ra theo c\u00e1c b\u01b0\u1edbc logic sau:<\/p>\n<ol>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> Ng\u01b0\u1eddi d\u00f9ng so\u1ea1n th\u1ea3o email v\u00e0 nh\u1ea5n n\u00fat G\u1eedi.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> M\u00e1y ch\u1ee7 g\u1eedi (MTA &#8211; Mail Transfer Agent) nh\u1eadn l\u1ec7nh v\u00e0 t\u00e1ch ph\u1ea7n t\u00ean mi\u1ec1n ra kh\u1ecfi \u0111\u1ecba ch\u1ec9 email ng\u01b0\u1eddi nh\u1eadn (v\u00ed d\u1ee5: t\u00e1ch &#8220;interdata.vn&#8221; t\u1eeb &#8220;support@interdata.vn&#8221;).<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> MTA truy v\u1ea5n h\u1ec7 th\u1ed1ng DNS \u0111\u1ec3 t\u00ecm b\u1ea3n ghi MX c\u1ee7a t\u00ean mi\u1ec1n &#8220;interdata.vn&#8221;.<\/li>\n<li><strong>B\u01b0\u1edbc 4:<\/strong> H\u1ec7 th\u1ed1ng DNS tr\u1ea3 v\u1ec1 danh s\u00e1ch c\u00e1c m\u00e1y ch\u1ee7 mail \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n nh\u1eadn th\u01b0 cho t\u00ean mi\u1ec1n n\u00e0y.<\/li>\n<li><strong>B\u01b0\u1edbc 5:<\/strong> MTA k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 mail c\u00f3 \u0111\u1ed9 \u01b0u ti\u00ean cao nh\u1ea5t v\u00e0 chuy\u1ec3n giao g\u00f3i tin email.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Cac-thanh-phan-quan-trong-trong-MX-Record\"><\/span>C\u00e1c th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong MX Record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Cau-truc-ky-thuat-cua-mot-ban-ghi-MX\"><\/span>C\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt c\u1ee7a m\u1ed9t b\u1ea3n ghi MX<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1ed9t b\u1ea3n ghi MX ho\u00e0n ch\u1ec9nh kh\u00f4ng ch\u1ec9 ch\u1ee9a \u0111\u1ecba ch\u1ec9 m\u00e1y ch\u1ee7. B\u1ea3n ghi n\u00e0y bao g\u1ed3m nhi\u1ec1u th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ea7n s\u1ef1 ch\u00ednh x\u00e1c tuy\u1ec7t \u0111\u1ed1i. Vi\u1ec7c hi\u1ec3u r\u00f5 t\u1eebng th\u00e0nh ph\u1ea7n gi\u00fap qu\u1ea3n tr\u1ecb vi\u00ean tr\u00e1nh \u0111\u01b0\u1ee3c c\u00e1c l\u1ed7i c\u1ea5u h\u00ecnh ph\u1ed5 bi\u1ebfn.<\/p>\n<figure id=\"attachment_38650\" aria-describedby=\"caption-attachment-38650\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-38650\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cau-truc-ky-thuat-MX-record.webp\" alt=\"C\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt MX record\" width=\"750\" height=\"409\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cau-truc-ky-thuat-MX-record.webp 750w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/05\/Cau-truc-ky-thuat-MX-record-300x164.webp 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-38650\" class=\"wp-caption-text\">C\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt MX record<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Priority-Do-uu-tien-trong-MX-Record-la-gi\"><\/span>Priority (\u0110\u1ed9 \u01b0u ti\u00ean) trong MX Record l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Priority l\u00e0 con s\u1ed1 \u0111i k\u00e8m v\u1edbi m\u1ed7i b\u1ea3n ghi MX, th\u01b0\u1eddng l\u00e0 0, 1, 5, 10, 20&#8230; Con s\u1ed1 n\u00e0y quy\u1ebft \u0111\u1ecbnh th\u1ee9 t\u1ef1 c\u00e1c m\u00e1y ch\u1ee7 mail s\u1ebd nh\u1eadn th\u01b0.<\/p>\n<p>Nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Priority r\u1ea5t \u0111\u01a1n gi\u1ea3n: <strong>S\u1ed1 c\u00e0ng nh\u1ecf, \u0111\u1ed9 \u01b0u ti\u00ean c\u00e0ng cao.<\/strong><\/p>\n<ul>\n<li>M\u00e1y ch\u1ee7 c\u00f3 Priority th\u1ea5p nh\u1ea5t (v\u00ed d\u1ee5: 0 ho\u1eb7c 1) s\u1ebd l\u00e0 \u0111\u00edch \u0111\u1ebfn \u0111\u1ea7u ti\u00ean c\u1ee7a email.<\/li>\n<li>C\u00e1c m\u00e1y ch\u1ee7 c\u00f3 Priority cao h\u01a1n (v\u00ed d\u1ee5: 10, 20) \u0111\u00f3ng vai tr\u00f2 d\u1ef1 ph\u00f2ng (Backup).<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 th\u1ef1c t\u1ebf:<\/strong><br \/>\nB\u1ea1n c\u00f3 hai m\u00e1y ch\u1ee7 mail:<br \/>\n&#8211; Mail Server A (Priority 10)<br \/>\n&#8211; Mail Server B (Priority 20)<br \/>\nH\u1ec7 th\u1ed1ng g\u1eedi th\u01b0 s\u1ebd lu\u00f4n c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i v\u1edbi Server A tr\u01b0\u1edbc. Ch\u1ec9 khi Server A b\u1ecb s\u1eadp ho\u1eb7c qu\u00e1 t\u1ea3i (downtime), h\u1ec7 th\u1ed1ng m\u1edbi chuy\u1ec3n h\u01b0\u1edbng sang k\u1ebft n\u1ed1i v\u1edbi Server B. \u0110\u00e2y l\u00e0 c\u01a1 ch\u1ebf Failover gi\u00fap \u0111\u1ea3m b\u1ea3o email kh\u00f4ng b\u1ecb th\u1ea5t l\u1ea1c ngay c\u1ea3 khi m\u00e1y ch\u1ee7 ch\u00ednh g\u1eb7p s\u1ef1 c\u1ed1.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Time-to-Live-TTL\"><\/span>Time to Live (TTL)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>TTL (Time to Live) quy \u0111\u1ecbnh th\u1eddi gian m\u00e0 th\u00f4ng tin b\u1ea3n ghi \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 nh\u1edb \u0111\u1ec7m (cache) c\u1ee7a c\u00e1c m\u00e1y ch\u1ee7 DNS trung gian. \u0110\u01a1n v\u1ecb t\u00ednh th\u01b0\u1eddng l\u00e0 gi\u00e2y.<\/p>\n<p>Khi b\u1ea1n thi\u1ebft l\u1eadp TTL l\u00e0 3600 (t\u01b0\u01a1ng \u0111\u01b0\u01a1ng 1 gi\u1edd), \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 n\u1ebfu m\u1ed9t m\u00e1y ch\u1ee7 kh\u00e1c \u0111\u00e3 truy v\u1ea5n MX Record c\u1ee7a b\u1ea1n, m\u00e1y ch\u1ee7 \u0111\u00f3 s\u1ebd nh\u1edb k\u1ebft qu\u1ea3 trong 1 gi\u1edd. Trong kho\u1ea3ng th\u1eddi gian n\u00e0y, m\u00e1y ch\u1ee7 \u0111\u00f3 s\u1ebd kh\u00f4ng c\u1ea7n h\u1ecfi l\u1ea1i h\u1ec7 th\u1ed1ng DNS g\u1ed1c n\u1eefa.<\/p>\n<p>Vi\u1ec7c \u0111\u1eb7t TTL qu\u00e1 th\u1ea5p s\u1ebd l\u00e0m t\u0103ng t\u1ea3i cho m\u00e1y ch\u1ee7 DNS. Ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1eb7t TTL qu\u00e1 cao s\u1ebd khi\u1ebfn c\u00e1c thay \u0111\u1ed5i c\u1ea5u h\u00ecnh m\u1ea5t nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 c\u1eadp nh\u1eadt tr\u00ean to\u00e0n c\u1ea7u.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"DestinationPoints-to-Dia-chi-dich\"><\/span>Destination\/Points to (\u0110\u1ecba ch\u1ec9 \u0111\u00edch)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 \u0111\u1ecba ch\u1ec9 c\u1ee7a m\u00e1y ch\u1ee7 mail th\u1ef1c t\u1ebf. C\u00f3 m\u1ed9t quy t\u1eafc &#8220;b\u1ea5t di b\u1ea5t d\u1ecbch&#8221; trong chu\u1ea9n k\u1ef9 thu\u1eadt Internet (RFC):<\/p>\n<p><strong>C\u1ea2NH B\u00c1O QUAN TR\u1eccNG:<\/strong><br \/>\nGi\u00e1 tr\u1ecb \u0111\u00edch c\u1ee7a MX Record <strong>PH\u1ea2I<\/strong> l\u00e0 m\u1ed9t t\u00ean mi\u1ec1n (Domain Name), v\u00ed d\u1ee5: <i>mail.google.com<\/i>. B\u1ea1n <strong>KH\u00d4NG \u0110\u01af\u1ee2C<\/strong> tr\u1ecf MX Record tr\u1ef1c ti\u1ebfp v\u1ec1 m\u1ed9t \u0111\u1ecba ch\u1ec9 IP (nh\u01b0 192.168.1.1). N\u1ebfu mu\u1ed1n tr\u1ecf v\u1ec1 IP, b\u1ea1n ph\u1ea3i t\u1ea1o m\u1ed9t A Record cho IP \u0111\u00f3 tr\u01b0\u1edbc, sau \u0111\u00f3 tr\u1ecf MX v\u1ec1 A Record n\u00e0y.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Huong-dan-cau-hinh-MX-Record-cho-cac-nha-cung-cap-pho-bien\"><\/span>H\u01b0\u1edbng d\u1eabn c\u1ea5u h\u00ecnh MX Record cho c\u00e1c nh\u00e0 cung c\u1ea5p ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ph\u1ea7n n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch thi\u1ebft l\u1eadp cho c\u00e1c d\u1ecbch v\u1ee5 email doanh nghi\u1ec7p th\u00f4ng d\u1ee5ng nh\u1ea5t hi\u1ec7n nay. InterData khuy\u1ebfn ngh\u1ecb b\u1ea1n sao l\u01b0u c\u1ea5u h\u00ecnh DNS hi\u1ec7n t\u1ea1i tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cau-hinh-MX-Record-cho-Google-Workspace-Gmail-doanh-nghiep\"><\/span>C\u1ea5u h\u00ecnh MX Record cho Google Workspace (Gmail doanh nghi\u1ec7p)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Google Workspace (tr\u01b0\u1edbc \u0111\u00e2y l\u00e0 G Suite) y\u00eau c\u1ea7u thi\u1ebft l\u1eadp ch\u00ednh x\u00e1c c\u00e1c b\u1ea3n ghi sau \u0111\u1ec3 k\u00edch ho\u1ea1t t\u00ednh n\u0103ng nh\u1eadn th\u01b0.<\/p>\n<figure class=\"table\">\n<table>\n<thead>\n<tr>\n<th>Priority (\u0110\u1ed9 \u01b0u ti\u00ean)<\/th>\n<th>Destination (\u0110\u1ecba ch\u1ec9 \u0111\u00edch)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>ASPMX.L.GOOGLE.COM<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>ALT1.ASPMX.L.GOOGLE.COM<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>ALT2.ASPMX.L.GOOGLE.COM<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>ALT3.ASPMX.L.GOOGLE.COM<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>ALT4.ASPMX.L.GOOGLE.COM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>G\u1ea7n \u0111\u00e2y, Google c\u0169ng \u0111\u00e3 gi\u1edbi thi\u1ec7u m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c c\u1ea5u h\u00ecnh \u0111\u01a1n gi\u1ea3n h\u01a1n ch\u1ec9 v\u1edbi m\u1ed9t b\u1ea3n ghi duy nh\u1ea5t cho c\u00e1c t\u00e0i kho\u1ea3n \u0111\u0103ng k\u00fd m\u1edbi sau n\u0103m 2023:<\/p>\n<ul>\n<li><strong>Priority:<\/strong> 1<\/li>\n<li><strong>Destination:<\/strong> smtp.google.com<\/li>\n<\/ul>\n<p>Tuy nhi\u00ean, c\u1ea5u h\u00ecnh 5 d\u00f2ng truy\u1ec1n th\u1ed1ng v\u1eabn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i v\u00e0 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh cao nh\u1ea5t.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cau-hinh-MX-Record-cho-Microsoft-365-OutlookExchange-Online\"><\/span>C\u1ea5u h\u00ecnh MX Record cho Microsoft 365 (Outlook\/Exchange Online)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kh\u00e1c v\u1edbi Google d\u00f9ng chung server cho m\u1ecdi ng\u01b0\u1eddi, Microsoft 365 s\u1eed d\u1ee5ng m\u1ed9t \u0111\u1ecba ch\u1ec9 MX duy nh\u1ea5t nh\u01b0ng \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a cho t\u1eebng t\u00ean mi\u1ec1n c\u1ee5 th\u1ec3.<\/p>\n<p>C\u1ea5u tr\u00fac b\u1ea3n ghi MX c\u1ee7a Microsoft 365 c\u00f3 d\u1ea1ng:<\/p>\n<p>Priority: 0<br \/>\nDestination: [ten-mien-cua-ban].mail.protection.outlook.com<\/p>\n<p>V\u00ed d\u1ee5: N\u1ebfu t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n l\u00e0 <i>interdata.vn<\/i>, b\u1ea3n ghi MX s\u1ebd l\u00e0 <code>interdata-vn.mail.protection.outlook.com<\/code>. L\u01b0u \u00fd r\u1eb1ng d\u1ea5u ch\u1ea5m (.) trong t\u00ean mi\u1ec1n th\u01b0\u1eddng \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng d\u1ea5u g\u1ea1ch ngang (-).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cau-hinh-MX-Record-cho-Zoho-Mail\"><\/span>C\u1ea5u h\u00ecnh MX Record cho Zoho Mail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Zoho Mail cung c\u1ea5p gi\u1ea3i ph\u00e1p email ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 c\u0169ng y\u00eau c\u1ea7u c\u1ea5u h\u00ecnh nhi\u1ec1u b\u1ea3n ghi \u0111\u1ec3 d\u1ef1 ph\u00f2ng.<\/p>\n<figure class=\"table\">\n<table>\n<thead>\n<tr>\n<th>Priority<\/th>\n<th>Destination<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>10<\/td>\n<td>mx.zoho.com<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>mx2.zoho.com<\/td>\n<\/tr>\n<tr>\n<td>50<\/td>\n<td>mx3.zoho.com<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>L\u01b0u \u00fd: N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng Data Center c\u1ee7a Zoho t\u1ea1i c\u00e1c khu v\u1ef1c kh\u00e1c (nh\u01b0 EU ho\u1eb7c CN), \u0111\u1ecba ch\u1ec9 \u0111\u00edch c\u00f3 th\u1ec3 thay \u0111\u1ed5i (v\u00ed d\u1ee5: mx.zoho.eu).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cau-hinh-tren-cPanel-Cloudflare\"><\/span>C\u1ea5u h\u00ecnh tr\u00ean cPanel \/ Cloudflare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>D\u00f9 b\u1ea1n s\u1eed d\u1ee5ng nh\u00e0 cung c\u1ea5p email n\u00e0o, thao t\u00e1c nh\u1eadp li\u1ec7u th\u01b0\u1eddng di\u1ec5n ra t\u1ea1i n\u01a1i qu\u1ea3n l\u00fd DNS c\u1ee7a t\u00ean mi\u1ec1n (nh\u01b0 Cloudflare, M\u1eaft B\u00e3o, hay trang qu\u1ea3n tr\u1ecb cPanel t\u1ea1i InterData).<\/p>\n<h4>C\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n tr\u00ean Cloudflare:<\/h4>\n<ol>\n<li>\u0110\u0103ng nh\u1eadp v\u00e0o t\u00e0i kho\u1ea3n Cloudflare v\u00e0 ch\u1ecdn t\u00ean mi\u1ec1n c\u1ea7n c\u1ea5u h\u00ecnh.<\/li>\n<li>Ch\u1ecdn m\u1ee5c <strong>DNS<\/strong> \u1edf menu b\u00ean tr\u00e1i.<\/li>\n<li>Nh\u1ea5n n\u00fat <strong>Add record<\/strong>.<\/li>\n<li>T\u1ea1i m\u1ee5c <strong>Type<\/strong>, ch\u1ecdn <strong>MX<\/strong>.<\/li>\n<li>T\u1ea1i m\u1ee5c <strong>Name<\/strong>, nh\u1eadp <code>@<\/code> (\u0111\u1ea1i di\u1ec7n cho t\u00ean mi\u1ec1n g\u1ed1c) ho\u1eb7c \u0111\u1ec3 tr\u1ed1ng.<\/li>\n<li>T\u1ea1i m\u1ee5c <strong>Mail server<\/strong>, nh\u1eadp \u0111\u1ecba ch\u1ec9 \u0111\u00edch (v\u00ed d\u1ee5: ASPMX.L.GOOGLE.COM).<\/li>\n<li>T\u1ea1i m\u1ee5c <strong>Priority<\/strong>, nh\u1eadp s\u1ed1 t\u01b0\u01a1ng \u1ee9ng (v\u00ed d\u1ee5: 1).<\/li>\n<li>Nh\u1ea5n <strong>Save<\/strong> \u0111\u1ec3 l\u01b0u l\u1ea1i.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Cach-kiem-tra-va-khac-phuc-su-co-MX-Record\"><\/span>C\u00e1ch ki\u1ec3m tra v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 MX Record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Sau khi c\u1ea5u h\u00ecnh, vi\u1ec7c ki\u1ec3m tra l\u1ea1i l\u00e0 b\u01b0\u1edbc b\u1eaft bu\u1ed9c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng v\u1eadn h\u00e0nh tr\u01a1n tru. \u0110\u1eebng \u0111\u1ee3i \u0111\u1ebfn khi kh\u00e1ch h\u00e0ng ph\u00e0n n\u00e0n m\u1edbi b\u1eaft \u0111\u1ea7u r\u00e0 so\u00e1t.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tai-sao-email-van-khong-hoat-dong-sau-khi-cau-hinh\"><\/span>T\u1ea1i sao email v\u1eabn kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng sau khi c\u1ea5u h\u00ecnh?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nhi\u1ec1u qu\u1ea3n tr\u1ecb vi\u00ean g\u1eb7p t\u00ecnh hu\u1ed1ng \u0111\u00e3 nh\u1eadp \u0111\u00fang th\u00f4ng s\u1ed1 nh\u01b0ng email v\u1eabn kh\u00f4ng v\u1ec1. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c nguy\u00ean nh\u00e2n v\u00e0 c\u00e1ch x\u1eed l\u00fd.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cong-cu-kiem-tra-MX-Record-MX-Lookup-Tools\"><\/span>C\u00f4ng c\u1ee5 ki\u1ec3m tra MX Record (MX Lookup Tools)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 tr\u1ef1c tuy\u1ebfn ho\u1eb7c d\u00f2ng l\u1ec7nh \u0111\u1ec3 soi chi ti\u1ebft c\u1ea5u h\u00ecnh hi\u1ec7n t\u1ea1i.<\/p>\n<h4>1. MxToolbox<\/h4>\n<p>\u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 ti\u00eau chu\u1ea9n trong ng\u00e0nh. B\u1ea1n ch\u1ec9 c\u1ea7n truy c\u1eadp website mxtoolbox.com, nh\u1eadp t\u00ean mi\u1ec1n v\u00e0 nh\u1ea5n &#8220;MX Lookup&#8221;. H\u1ec7 th\u1ed1ng s\u1ebd li\u1ec7t k\u00ea c\u00e1c b\u1ea3n ghi hi\u1ec7n c\u00f3 v\u00e0 c\u1ea3nh b\u00e1o m\u00e0u \u0111\u1ecf n\u1ebfu ph\u00e1t hi\u1ec7n l\u1ed7i c\u1ea5u h\u00ecnh ho\u1eb7c IP b\u1ecb li\u1ec7t v\u00e0o danh s\u00e1ch \u0111en (Blacklist).<\/p>\n<h4>2. S\u1eed d\u1ee5ng d\u00f2ng l\u1ec7nh (Command Line)<\/h4>\n<p>N\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng Windows ho\u1eb7c macOS, c\u00f4ng c\u1ee5 c\u00f3 s\u1eb5n trong m\u00e1y t\u00ednh s\u1ebd cho k\u1ebft qu\u1ea3 nhanh nh\u1ea5t v\u00e0 trung th\u1ef1c nh\u1ea5t.<\/p>\n<p>M\u1edf Terminal (Mac) ho\u1eb7c Command Prompt (Windows) v\u00e0 g\u00f5 l\u1ec7nh:<\/p>\n<p>nslookup -type=mx interdata.vn<\/p>\n<p>K\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 s\u1ebd hi\u1ec3n th\u1ecb danh s\u00e1ch c\u00e1c mail exchanger v\u00e0 \u0111\u1ed9 \u01b0u ti\u00ean c\u1ee7a ch\u00fang. N\u1ebfu k\u1ebft qu\u1ea3 tr\u1ea3 v\u1ec1 r\u1ed7ng ho\u1eb7c sai \u0111\u1ecba ch\u1ec9, b\u1ea1n c\u1ea7n quay l\u1ea1i b\u01b0\u1edbc c\u1ea5u h\u00ecnh DNS.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Thoi-gian-lan-truyen-DNS-Propagation-Time\"><\/span>Th\u1eddi gian lan truy\u1ec1n DNS (Propagation Time)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>H\u1ec7 th\u1ed1ng DNS to\u00e0n c\u1ea7u ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t m\u1ea1ng l\u01b0\u1edbi kh\u1ed5ng l\u1ed3. Khi b\u1ea1n thay \u0111\u1ed5i b\u1ea3n ghi t\u1ea1i Vi\u1ec7t Nam, th\u00f4ng tin n\u00e0y c\u1ea7n th\u1eddi gian \u0111\u1ec3 c\u1eadp nh\u1eadt \u0111\u1ebfn c\u00e1c m\u00e1y ch\u1ee7 DNS \u1edf M\u1ef9, Ch\u00e2u \u00c2u hay Nh\u1eadt B\u1ea3n.<\/p>\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y g\u1ecdi l\u00e0 lan truy\u1ec1n DNS. Th\u00f4ng th\u01b0\u1eddng, th\u1eddi gian c\u1eadp nh\u1eadt m\u1ea5t t\u1eeb 1 gi\u1edd \u0111\u1ebfn 48 gi\u1edd. Trong kho\u1ea3ng th\u1eddi gian n\u00e0y, email c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng ch\u1eadp ch\u1eddn (l\u00fac nh\u1eadn \u0111\u01b0\u1ee3c, l\u00fac kh\u00f4ng). \u0110\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng b\u00ecnh th\u01b0\u1eddng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cac-loi-thuong-gap-Common-Mistakes\"><\/span>C\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p (Common Mistakes)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>L\u1ed7i xung \u0111\u1ed9t CNAME:<\/strong> N\u1ebfu t\u00ean mi\u1ec1n g\u1ed1c (root domain) \u0111\u00e3 c\u00f3 m\u1ed9t b\u1ea3n ghi CNAME, b\u1ea3n ghi MX s\u1ebd b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a. \u0110\u00e2y l\u00e0 quy t\u1eafc k\u1ef9 thu\u1eadt b\u1eaft bu\u1ed9c. B\u1ea1n ph\u1ea3i x\u00f3a CNAME \u1edf root domain n\u1ebfu mu\u1ed1n d\u00f9ng email.<\/li>\n<li><strong>Nh\u1ea7m l\u1eabn Priority:<\/strong> \u0110\u1eb7t m\u00e1y ch\u1ee7 d\u1ef1 ph\u00f2ng c\u00f3 Priority th\u1ea5p h\u01a1n m\u00e1y ch\u1ee7 ch\u00ednh. \u0110i\u1ec1u n\u00e0y khi\u1ebfn th\u01b0 ch\u1ea1y v\u00e0o server y\u1ebfu h\u01a1n, g\u00e2y t\u1eafc ngh\u1ebdn.<\/li>\n<li><strong>D\u01b0 th\u1eeba b\u1ea3n ghi c\u0169:<\/strong> Khi chuy\u1ec3n t\u1eeb nh\u00e0 cung c\u1ea5p c\u0169 sang m\u1edbi (v\u00ed d\u1ee5 t\u1eeb Hosting cPanel sang Google Workspace), b\u1ea1n qu\u00ean x\u00f3a c\u00e1c b\u1ea3n ghi MX c\u0169. Vi\u1ec7c t\u1ed3n t\u1ea1i song song hai h\u1ec7 th\u1ed1ng MX kh\u00e1c nhau s\u1ebd khi\u1ebfn email b\u1ecb th\u1ea5t l\u1ea1c ng\u1eabu nhi\u00ean.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"MX-Record-va-Bao-mat-Email\"><\/span>MX Record v\u00e0 B\u1ea3o m\u1eadt Email<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Moi-quan-he-giua-MX-Record-SPF-DKIM-va-DMARC\"><\/span>M\u1ed1i quan h\u1ec7 gi\u1eefa MX Record, SPF, DKIM v\u00e0 DMARC<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nhi\u1ec1u ng\u01b0\u1eddi l\u1ea7m t\u01b0\u1edfng ch\u1ec9 c\u1ea7n c\u1ea5u h\u00ecnh MX l\u00e0 \u0111\u1ee7. Th\u1ef1c t\u1ebf, MX Record ch\u1ec9 gi\u1ea3i quy\u1ebft chi\u1ec1u <strong>NH\u1eacN<\/strong> th\u01b0. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o chi\u1ec1u <strong>G\u1eecI<\/strong> th\u01b0 \u0111i kh\u00f4ng b\u1ecb r\u01a1i v\u00e0o h\u00f2m th\u01b0 r\u00e1c (Spam\/Junk) c\u1ee7a \u0111\u1ed1i t\u00e1c, b\u1ea1n c\u1ea7n b\u1ed9 ba b\u1ea3o m\u1eadt: SPF, DKIM v\u00e0 DMARC.<\/p>\n<ul>\n<li><strong>MX Record:<\/strong> Kh\u1eb3ng \u0111\u1ecbnh &#8220;T\u00f4i nh\u1eadn th\u01b0 \u1edf \u0111\u00e2y&#8221;.<\/li>\n<li><strong>SPF (Sender Policy Framework):<\/strong> Kh\u1eb3ng \u0111\u1ecbnh &#8220;\u0110\u1ecba ch\u1ec9 IP n\u00e0y \u0111\u01b0\u1ee3c ph\u00e9p g\u1eedi th\u01b0 thay m\u1eb7t t\u00f4i&#8221;. N\u1ebfu thi\u1ebfu SPF, k\u1ebb gian c\u00f3 th\u1ec3 gi\u1ea3 m\u1ea1o t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n \u0111\u1ec3 g\u1eedi th\u01b0 l\u1eeba \u0111\u1ea3o.<\/li>\n<li><strong>DKIM (DomainKeys Identified Mail):<\/strong> G\u1eafn m\u1ed9t ch\u1eef k\u00fd s\u1ed1 v\u00e0o m\u1ed7i email g\u1eedi \u0111i, gi\u00fap ng\u01b0\u1eddi nh\u1eadn x\u00e1c minh th\u01b0 kh\u00f4ng b\u1ecb ch\u1ec9nh s\u1eeda tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n.<\/li>\n<li><strong>DMARC:<\/strong> Quy \u0111\u1ecbnh h\u00e0nh \u0111\u1ed9ng x\u1eed l\u00fd n\u1ebfu m\u1ed9t email vi ph\u1ea1m chu\u1ea9n SPF ho\u1eb7c DKIM (v\u00ed d\u1ee5: t\u1ef1 \u0111\u1ed9ng x\u00f3a ho\u1eb7c \u0111\u01b0a v\u00e0o spam).<\/li>\n<\/ul>\n<p><strong>L\u1eddi khuy\u00ean t\u1eeb chuy\u00ean gia InterData:<\/strong><br \/>\nNgay sau khi tr\u1ecf xong MX Record, h\u00e3y thi\u1ebft l\u1eadp ngay b\u1ea3n ghi TXT cho SPF. V\u00ed d\u1ee5 v\u1edbi Google Workspace, b\u1ea3n ghi SPF c\u01a1 b\u1ea3n l\u00e0: <code>v=spf1 include:_spf.google.com ~all<\/code>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cau-hoi-thuong-gap-FAQs\"><\/span>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1-Toi-co-the-co-nhieu-ban-ghi-MX-cho-mot-ten-mien-khong\"><\/span>1. T\u00f4i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u b\u1ea3n ghi MX cho m\u1ed9t t\u00ean mi\u1ec1n kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f3, v\u00e0 \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c khuy\u1ebfn kh\u00edch m\u1ea1nh m\u1ebd. Vi\u1ec7c c\u00f3 nhi\u1ec1u b\u1ea3n ghi MX t\u1ea1o ra c\u01a1 ch\u1ebf d\u1ef1 ph\u00f2ng (Failover). N\u1ebfu m\u1ed9t m\u00e1y ch\u1ee7 g\u1eb7p s\u1ef1 c\u1ed1, c\u00e1c m\u00e1y ch\u1ee7 c\u00f2n l\u1ea1i trong danh s\u00e1ch s\u1ebd \u0111\u1ea3m nh\u1eadn vi\u1ec7c nh\u1eadn th\u01b0, \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng li\u00ean l\u1ea1c kh\u00f4ng b\u1ecb gi\u00e1n \u0111o\u1ea1n.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2-MX-Record-tro-ve-dia-chi-IP-duoc-khong\"><\/span>2. MX Record tr\u1ecf v\u1ec1 \u0111\u1ecba ch\u1ec9 IP \u0111\u01b0\u1ee3c kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kh\u00f4ng. Theo chu\u1ea9n RFC quy \u0111\u1ecbnh v\u1ec1 giao th\u1ee9c Internet, MX Record b\u1eaft bu\u1ed9c ph\u1ea3i tr\u1ecf v\u1ec1 m\u1ed9t t\u00ean mi\u1ec1n \u0111\u1ea7y \u0111\u1ee7 (FQDN). Kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p tr\u1ecf tr\u1ef1c ti\u1ebfp v\u1ec1 \u0111\u1ecba ch\u1ec9 IP. N\u1ebfu b\u1ea1n c\u1ed1 t\u00ecnh l\u00e0m v\u1eady, m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng g\u1eedi th\u01b0 nghi\u00eam ng\u1eb7t s\u1ebd t\u1eeb ch\u1ed1i g\u1eedi email cho b\u1ea1n.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3-Thay-doi-MX-Record-mat-bao-lau-de-co-hieu-luc\"><\/span>3. Thay \u0111\u1ed5i MX Record m\u1ea5t bao l\u00e2u \u0111\u1ec3 c\u00f3 hi\u1ec7u l\u1ef1c?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Th\u1eddi gian hi\u1ec7u l\u1ef1c ph\u1ee5 thu\u1ed9c v\u00e0o ch\u1ec9 s\u1ed1 TTL (Time to Live) m\u00e0 b\u1ea1n thi\u1ebft l\u1eadp tr\u01b0\u1edbc \u0111\u00f3. Tuy nhi\u00ean, do t\u00ednh ch\u1ea5t ph\u00e2n t\u00e1n c\u1ee7a h\u1ec7 th\u1ed1ng DNS to\u00e0n c\u1ea7u, qu\u00e1 tr\u00ecnh c\u1eadp nh\u1eadt ho\u00e0n t\u1ea5t th\u01b0\u1eddng m\u1ea5t t\u1eeb 1 gi\u1edd \u0111\u1ebfn t\u1ed1i \u0111a 48 gi\u1edd.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4-Su-khac-biet-giua-A-Record-va-MX-Record-la-gi\"><\/span>4. S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa A Record v\u00e0 MX Record l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A Record d\u00f9ng \u0111\u1ec3 tr\u1ecf t\u00ean mi\u1ec1n v\u1ec1 \u0111\u1ecba ch\u1ec9 IP c\u1ee7a m\u00e1y ch\u1ee7 ch\u1ee9a Website. Trong khi \u0111\u00f3, MX Record chuy\u00ean bi\u1ec7t d\u00f9ng \u0111\u1ec3 \u0111\u1ecbnh tuy\u1ebfn Email. Hai b\u1ea3n ghi n\u00e0y ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp. Website c\u00f3 th\u1ec3 n\u1eb1m \u1edf Server A, trong khi Email n\u1eb1m \u1edf Server B.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5-Neu-xoa-MX-Record-thi-chuyen-gi-xay-ra\"><\/span>5. N\u1ebfu x\u00f3a MX Record th\u00ec chuy\u1ec7n g\u00ec x\u1ea3y ra?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>N\u1ebfu b\u1ea1n x\u00f3a to\u00e0n b\u1ed9 b\u1ea3n ghi MX, t\u00ean mi\u1ec1n c\u1ee7a b\u1ea1n s\u1ebd m\u1ea5t kh\u1ea3 n\u0103ng nh\u1eadn email. Ng\u01b0\u1eddi g\u1eedi th\u01b0 \u0111\u1ebfn cho b\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o l\u1ed7i t\u1eeb h\u1ec7 th\u1ed1ng (th\u01b0\u1eddng l\u00e0 m\u00e3 l\u1ed7i &#8220;550 No Such User&#8221; ho\u1eb7c &#8220;Message Delivery Failed&#8221;).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Loi-ket\"><\/span>L\u1eddi k\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>MX Record \u0111\u00f3ng vai tr\u00f2 x\u01b0\u01a1ng s\u1ed1ng trong h\u1ec7 th\u1ed1ng giao ti\u1ebfp \u0111i\u1ec7n t\u1eed c\u1ee7a doanh nghi\u1ec7p. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, bi\u1ebft c\u00e1ch c\u1ea5u h\u00ecnh ch\u00ednh x\u00e1c v\u00e0 x\u1eed l\u00fd s\u1ef1 c\u1ed1 k\u1ecbp th\u1eddi s\u1ebd gi\u00fap doanh nghi\u1ec7p duy tr\u00ec lu\u1ed3ng th\u00f4ng tin th\u00f4ng su\u1ed1t, chuy\u00ean nghi\u1ec7p.<\/p>\n<p>Hy v\u1ecdng b\u00e0i vi\u1ebft h\u01b0\u1edbng d\u1eabn chi ti\u1ebft n\u00e0y \u0111\u00e3 gi\u00fap b\u1ea1n n\u1eafm v\u1eefng c\u00e1c ki\u1ebfn th\u1ee9c k\u1ef9 thu\u1eadt c\u1ea7n thi\u1ebft. M\u1ed9t h\u1ec7 th\u1ed1ng email \u1ed5n \u0111\u1ecbnh b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t n\u1ec1n t\u1ea3ng DNS v\u1eefng ch\u1eafc.<\/p>\n<p>N\u1ebfu b\u1ea1n g\u1eb7p kh\u00f3 kh\u0103n trong qu\u00e1 tr\u00ecnh c\u1ea5u h\u00ecnh ho\u1eb7c c\u1ea7n t\u01b0 v\u1ea5n v\u1ec1 c\u00e1c gi\u1ea3i ph\u00e1p <a href=\"https:\/\/interdata.vn\/thue-hosting\/\"><strong>Hosting hi\u1ec7u n\u0103ng cao<\/strong><\/a> cho Doanh Nghi\u1ec7p, <a href=\"https:\/\/interdata.vn\/cloud-server\/\"><strong>Cloud Server ch\u1ea5t l\u01b0\u1ee3ng cao<\/strong><\/a> ho\u1eb7c c\u1ea7n <a href=\"https:\/\/interdata.vn\/thue-vps\/\"><strong>thu\u00ea M\u00e1y ch\u1ee7 \u1ea3o VPS<\/strong><\/a>, \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a InterData lu\u00f4n s\u1eb5n s\u00e0ng h\u1ed7 tr\u1ee3.<\/p>\n<p><strong>Li\u00ean h\u1ec7 InterData ngay:<\/strong><\/p>\n<ul>\n<li><strong>HOTLINE:\u00a0<a href=\"tel:1900636822\">1900 636 822<\/a><\/strong><\/li>\n<li><strong>WEBSITE:\u00a0<a href=\"https:\/\/interdata.vn\/\" target=\"_blank\" rel=\"noopener\">interdata.vn<\/a><\/strong><\/li>\n<li><strong>FANPAGE:\u00a0<a href=\"https:\/\/facebook.com\/interdata.com.vn\" target=\"_blank\" rel=\"nofollow noopener\">facebook.com\/interdata.com.vn<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n g\u1eedi email quan tr\u1ecdng cho \u0111\u1ed1i t\u00e1c nh\u01b0ng h\u1ecd kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c. H\u1ec7 th\u1ed1ng tr\u1ea3 l\u1ea1i th\u01b0 v\u1edbi th\u00f4ng b\u00e1o l\u1ed7i kh\u00f3 hi\u1ec3u. Kh\u00e1ch h\u00e0ng ph\u00e0n n\u00e0n r\u1eb1ng h\u1ecd g\u1eedi th\u01b0 cho b\u1ea1n nh\u01b0ng kh\u00f4ng th\u1ea5y ph\u1ea3n h\u1ed3i. Nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 c\u1ee7a nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y th\u01b0\u1eddng n\u1eb1m \u1edf c\u1ea5u h\u00ecnh DNS, c\u1ee5<\/p>\n","protected":false},"author":2,"featured_media":38652,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-27867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27867","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=27867"}],"version-history":[{"count":3,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27867\/revisions"}],"predecessor-version":[{"id":38655,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/27867\/revisions\/38655"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/38652"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=27867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=27867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=27867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}