{"id":29463,"date":"2025-08-21T12:57:43","date_gmt":"2025-08-21T05:57:43","guid":{"rendered":"https:\/\/dps.media\/cach-kiem-tra-dns-ten-mien-a-record-va-mx-record-don-gian\/"},"modified":"2025-08-21T12:57:55","modified_gmt":"2025-08-21T05:57:55","slug":"how-to-check-dns-domain-name-a-record-and-mx-record-simply","status":"publish","type":"post","link":"https:\/\/dps.media\/en\/how-to-check-dns-domain-name-a-record-and-mx-record-simply\/","title":{"rendered":"How to check domain DNS, A record and MX record simply"},"content":{"rendered":"<p>\t\t<\/p><div id=\"dps-dns-lookup-1-6137\" class=\"dps-dns-widget\" data-limit=\"100\" data-delay=\"120\" data-brand=\"DPS.MEDIA\" data-txt-all-dns=\"ALL DNS\" data-txt-stopping=\"Stopping...\" data-txt-enter-domain=\"Please enter at least one domain.\" data-txt-select-column=\"Please select at least one check type.\" data-txt-limit-exceeded=\"The list exceeds the limit of %s domains. Please split the list.\" data-txt-missing-config=\"Missing REST endpoint configuration.\" data-txt-stopped-at=\"Stopped at %s\/%s.\" data-txt-completed=\"Completed: %s domain(s) x %s column(s).\" data-txt-no-data-copy=\"No data to copy.\" data-txt-copied=\"TSV copied to clipboard.\" data-txt-copy-failed=\"Copy failed: %s\" data-txt-ready=\"Ready for DNS & server lookup\" data-txt-empty-subtext=\"One domain per line, check types are columns.\" data-txt-domain=\"Domain\" data-txt-empty=\"Empty\" data-txt-error=\"Error\" data-txt-conn-failed=\"Connection failed\" data-txt-no-cert=\"No certificate\" data-txt-parse-error=\"Parse error\" data-txt-days-left=\"days left\">\n\t\t\t<div class=\"dps-dns-shell\">\n\t\t\t\t<!-- Hidden translation container for TranslatePress compatibility -->\n\t\t\t\t<div class=\"dps-dns-translations\" style=\"display: none;\" aria-hidden=\"true\">\n\t\t\t\t\t<span class=\"t-txt-all-dns\">ALL DNS<\/span>\n\t\t\t\t\t<span class=\"t-txt-stopping\">Stopping...<\/span>\n\t\t\t\t\t<span class=\"t-txt-enter-domain\">Please enter at least one domain.<\/span>\n\t\t\t\t\t<span class=\"t-txt-select-column\">Please select at least one check type.<\/span>\n\t\t\t\t\t<span class=\"t-txt-limit-exceeded\">The list exceeds the limit of %s domains. Please split the list.<\/span>\n\t\t\t\t\t<span class=\"t-txt-missing-config\">Missing REST endpoint configuration.<\/span>\n\t\t\t\t\t<span class=\"t-txt-stopped-at\">Stopped at %s\/%s.<\/span>\n\t\t\t\t\t<span class=\"t-txt-completed\">Completed: %s domain(s) x %s column(s).<\/span>\n\t\t\t\t\t<span class=\"t-txt-no-data-copy\">No data to copy.<\/span>\n\t\t\t\t\t<span class=\"t-txt-copied\">TSV copied to clipboard.<\/span>\n\t\t\t\t\t<span class=\"t-txt-copy-failed\">Copy failed: %s<\/span>\n\t\t\t\t\t<span class=\"t-txt-ready\">Ready for DNS & server lookup<\/span>\n\t\t\t\t\t<span class=\"t-txt-empty-subtext\">One domain per line, check types are columns.<\/span>\n\t\t\t\t\t<span class=\"t-txt-domain\">Domain<\/span>\n\t\t\t\t\t<span class=\"t-txt-empty\">Empty<\/span>\n\t\t\t\t\t<span class=\"t-txt-error\">Error<\/span>\n\t\t\t\t\t<span class=\"t-txt-conn-failed\">Connection failed<\/span>\n\t\t\t\t\t<span class=\"t-txt-no-cert\">No certificate<\/span>\n\t\t\t\t\t<span class=\"t-txt-parse-error\">Parse error<\/span>\n\t\t\t\t\t<span class=\"t-txt-days-left\">days left<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"dps-dns-header\">\n\t\t\t\t\t<div class=\"dps-dns-header-mark\" aria-hidden=\"true\">DPS<\/div>\n\t\t\t\t\t<div class=\"dps-dns-header-copy\">\n\t\t\t\t\t\t<div class=\"dps-dns-title\">Bulk DNS & Server Lookup<\/div>\n\t\t\t\t\t\t<div class=\"dps-dns-subtitle\">Professional tool from DPS.MEDIA<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"dps-dns-brand\">DPS.MEDIA<\/div>\n\t\t\t\t<\/div>\n\n\t\t\t\t<div class=\"dps-dns-description\">Enter one domain per line, select columns to check, then copy results as TSV.<\/div>\n\n\t\t\t\t<div class=\"dps-dns-workbench\">\n\t\t\t\t\t<div class=\"dps-dns-input-panel\">\n\t\t\t\t\t\t<label class=\"dps-dns-label\" for=\"dps-dns-lookup-1-6137-domains\">Domain list<\/label>\n\t\t\t\t\t\t<div class=\"dps-dns-textarea-wrap\">\n\t\t\t\t\t\t\t<textarea id=\"dps-dns-lookup-1-6137-domains\" class=\"dps-dns-textarea\" rows=\"7\" spellcheck=\"false\" placeholder=\"dps.mediaexample.comhttps:\/\/sub.domain.com\/path\"><\/textarea>\n\t\t\t\t\t\t\t<div class=\"dps-dns-count\" aria-live=\"polite\">0<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"dps-dns-control-panel\">\n\t\t\t\t\t\t<div class=\"dps-dns-control-group\">\n\t\t\t\t\t\t\t<div class=\"dps-dns-label\">Columns to check<\/div>\n\t\t\t\t\t\t\t<div class=\"dps-dns-types\" role=\"group\" aria-label=\"Select DNS and server columns to check\"><\/div>\n\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\t<div class=\"dps-dns-control-row\">\n\t\t\t\t\t\t\t<label class=\"dps-dns-delay\">\n\t\t\t\t\t\t\t\t<span class=\"dps-dns-label\">Delay<\/span>\n\t\t\t\t\t\t\t\t<span class=\"dps-dns-delay-input\">\n\t\t\t\t\t\t\t\t\t<input class=\"dps-dns-delay-field\" type=\"number\" min=\"50\" max=\"5000\" step=\"10\" value=\"120\">\n\t\t\t\t\t\t\t\t\t<span>ms<\/span>\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<\/label>\n\t\t\t\t\t\t\t<button class=\"dps-dns-button dps-dns-button-primary\" type=\"button\" data-action=\"run\">Start<\/button>\n\t\t\t\t\t\t\t<button class=\"dps-dns-button dps-dns-button-danger\" type=\"button\" data-action=\"stop\" hidden>Stop<\/button>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\n\t\t\t\t<div class=\"dps-dns-toolbar\">\n\t\t\t\t\t<button class=\"dps-dns-tool-button\" type=\"button\" data-action=\"copy\" disabled>Copy TSV<\/button>\n\t\t\t\t\t<button class=\"dps-dns-tool-button\" type=\"button\" data-action=\"clear\">Clear results<\/button>\n\t\t\t\t\t<div class=\"dps-dns-progress\" aria-hidden=\"true\"><span><\/span><\/div>\n\t\t\t\t\t<div class=\"dps-dns-status\" aria-live=\"polite\"><\/div>\n\t\t\t\t<\/div>\n\n\t\t\t\t<div class=\"dps-dns-error\" role=\"alert\" hidden><\/div>\n\t\t\t\t<div class=\"dps-dns-results\" aria-live=\"polite\">\n\t\t\t\t\t<div class=\"dps-dns-empty\">\n\t\t\t\t\t\t<div class=\"dps-dns-empty-icon\" aria-hidden=\"true\">Lookup<\/div>\n\t\t\t\t\t\t<div class=\"dps-dns-empty-title\">Ready for DNS & server lookup<\/div>\n\t\t\t\t\t\t<div class=\"dps-dns-empty-copy\">One domain per line, check types are columns.<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\n\t\t\t\t<div class=\"dps-dns-footer\">\n\t\t\t\t\t<span>Developed by<\/span>\n\t\t\t\t\t<a href=\"https:\/\/dps.media\/en\/\" target=\"_blank\" rel=\"noopener noreferrer\">DPS.MEDIA<\/a>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><strong>Checking domain DNS, A record, and MX record is an important step to ensure stable website and email operation.<\/strong><p> Up to 90% of access and email sending\/receiving failures originate from incorrect DNS errors.  <\/p><p>DPS.MEDIA, with experience consulting digital marketing for hundreds of SMEs, emphasizes that this check helps prevent data loss and increase online operational efficiency.<br><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/-la-gi.jpg5d3a.jpg\" alt=\"Decoding the role of DNS in the online business strategy of SMEs\" title=\"\"><\/p><h2 id=\"giai-ma-vai-tro-cua-dns-trong-chien-luoc-kinh-doanh-truc-tuyen-cua-doanh-nghiep-smes\">Decoding the role of \u2062DNS\u2064 in the online business strategy of SMEs<\/h2><h3>Why is DNS an important \u200blayer\u200b \u2062infrastructure?<\/h3><p>DNS (Domain Name System) is not only the \u201dphonebook\u201d of the internet, but also a bridge ensuring every access to websites, emails, and applications happens smoothly and accurately. For SMEs, proper DNS management determines:<\/p><ul>\n<li><strong>Page loading speed<\/strong>: Reducing server response time (TTFB) helps improve user experience.<\/li>\n<li><strong>SEO ranking<\/strong>: Google prioritizes websites with fast and stable response.<\/li>\n<li><strong>Security<\/strong>: Avoid DNS Spoofing attacks and DNS redirect fraud.<\/li>\n<\/ul><p>According to the Global DNS Performance report (ThousandEyes, 2023), just a 500ms increase in DNS lookup can reduce the average e-commerce conversion rate by 12%.<\/p><h3>DNS records\u200c directly \u2063affect business operations<\/h3><p>The three most common DNS records SMEs need to understand and regularly check:<\/p><ul>\n<li><strong>A record<\/strong>: Maps domain name to a specific IP address. Incorrect IP record causes the website to be inaccessible.<\/li>\n<li><strong>MX record<\/strong>: Identifies the receiving email server \u2013 incorrect configuration can lead to lost emails.<\/li>\n<li><strong>CNAME &amp; TXT<\/strong>: Th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u200dd\u00f9ng cho x\u00e1c th\u1ef1c d\u1ecbch v\u1ee5 marketing (Google, Facebook\u200d Pixel, Mailchimp\u2026)<\/li>\n<\/ul><div class=\"wp-block-group has-background\" style=\"background-color:#F3F4F5;padding:15px;border-left: 4px solid #0073AA\">\n  <strong>TIP:<\/strong> You should check DNS regularly every month or after each time you change hosting, email server, or integrate a new platform.\n<\/div><h3>Periodic DNS check checklist for \u2062businesses<\/h3><table class=\"wordpress\">\n<thead>\n<tr>\n<th>M\u1ee5c \u2064c\u1ea7n\u2062 ki\u1ec3m tra<\/th>\n<th>Frequency<\/th>\n<th>Recommended tools<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A record (accurate IP mapping)<\/td>\n<td>Once a month<\/td>\n<td>DNS \u200bChecker, Pingdom<\/td>\n<\/tr>\n<tr>\n<td>MX record (stable email operation)<\/td>\n<td>Once every 2 weeks<\/td>\n<td>MXToolbox, Google Admin Toolbox<\/td>\n<\/tr>\n<tr>\n<td>Check CNAME\/TXT errors<\/td>\n<td>When integrating new tools<\/td>\n<td>NSLookup, DNSSpy<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>Real-world example: A small \u2063mistake, \u2064big damage<\/h3><p>An SME specializing in selling cosmetics in Ho Chi Minh City once lost all email marketing traffic for 3 days just because they forgot to update the MX record after switching email providers. Result: Over 1,000 sent emails were returned, reducing order volume from email channels by 23% compared to the previous week. Estimated loss exceeded 11 million VND.<\/p><h3>Hidden challenges \u200bif \u200byou skip\u2064 DNS<\/h3><ul>\n<li><strong>Website downtime<\/strong>: C\u1ea5u h\u00ecnh sai g\u00e2y gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5, m\u1ea5t \u0111i\u1ec3m \u200btin \u2062c\u1eady kh\u00e1ch h\u00e0ng.<\/li>\n<li><strong>Information leak<\/strong>: DNS attacks or spoofing can lead to loss of personal user data.<\/li>\n<li><strong>Email to spam folder<\/strong>: Missing authentication records cause emails not to reach customers.<\/li>\n<\/ul><h3>Brief takeaway:<\/h3><p><strong>A stable DNS is the sustainable online business operation platform for SMEs.<\/strong> Prioritize regularly checking DNS records as part of brand protection and revenue strategy.<br><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/ming-4.jpg\" alt=\"Distinguish and clearly specify the important DNS record types for domain names\" title=\"\"><\/p><h2 id=\"phan-biet-va-hieu-ro-cac-loai-ban-ghi-dns-quan-trong-cho-ten-mien\">Distinguish and clearly understand \u2064the\u2063 important types of \u200bDNS records for \u2062domain names<\/h2><h3>1. A Record \u2013 IP address routing<\/h3><p>\u2013 Record <strong>A (Address)<\/strong> k\u1ebft\u2064 n\u1ed1i t\u00ean mi\u1ec1n v\u1edbi \u0111\u1ecba ch\u1ec9\u200c IP m\u00e1y ch\u1ee7 (IPv4). \u200b<br>\n\u2013 Is the most important type that helps browsers identify where the website is located.<br>\n\u2013 Practical example: www.example.com =&gt; 192.168.1.10  <\/p><div class=\"wp-block-group has-background\">\n<p><strong>Tip:<\/strong> If the website cannot be accessed, please re-check the A record and ensure the IP is correct &amp; active.<\/p>\n<\/div><h3>2. MX record \u2064- Email routing to servers<\/h3><p>\u2013 <strong>MX\u200d (Mail \u2064exchange)<\/strong> directs emails to the appropriate mail server.<br>\n\u2013 Must always be set up correctly according to Priority to ensure emails reach the right place.<br>\n\u2013 Real-life situation: Many small businesses do not receive emails due to incorrect MX records, especially when migrating hosting.<\/p><h3>3. Other commonly used DNS\u200d records<\/h3><p>\u2013 <strong>CNAME:<\/strong> Redirects one subdomain to another domain name (e.g., blog.example.com \u2192 www.example.com)<br>\n\u2013 <strong>TXT:<\/strong> Used to verify domain ownership and set SPF, DKIM to prevent email spoofing.<br>\n\u2013 <strong>NS:<\/strong> Specifies DNS servers responsible for managing the domain name.  <\/p><h3>4. Practical DNS check checklist<\/h3><ul>\n<li>\u2705 check that the A record points to the correct IP (active &amp; latest update)<\/li>\n<li>\u2705 MX Record has at least 1 main server &amp; appropriate priority<\/li>\n<li>\u2705 Add SPF, DKIM records in TXT to protect email<\/li>\n<li>\u2705 NS points to the correct DNS provider (cloudflare, Google DNS\u2026)<\/li>\n<\/ul><h3>5. Specific examples from real users<\/h3><p>A small business website (anonymous) was offline for 36 hours due to hosting IP change but no A record update. Simultaneously, company email was down due to missing MX records. After using free DNS checking tools like MxToolbox in 2023, the issues were detected and resolved within 15 minutes.<\/p><h3>Illustration of common DNS record types<\/h3><table class=\"wordpress\">\n<thead>\n<tr>\n<th>Record type<\/th>\n<th>Main function<\/th>\n<th>Example<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A<\/td>\n<td>Maps domain name to IP<\/td>\n<td>example.com \u2192 192.168.1.100<\/td>\n<\/tr>\n<tr>\n<td>MX<\/td>\n<td>Forwards email<\/td>\n<td>10 mail.example.com<\/td>\n<\/tr>\n<tr>\n<td>CNAME<\/td>\n<td>Alias domain name<\/td>\n<td>shop.example.com \u279d www.example.com<\/td>\n<\/tr>\n<tr>\n<td>TXT<\/td>\n<td>Authentication information<\/td>\n<td>v=spf1 include:_spf.google.com ~all<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>6. Warnings &amp; challenges<\/h3><p>-\u200b Incorrect records may cause the website or email to not function. \u2064\u2064<br>\n-\u200c DNS changes may take up to 24-48 hours to fully update (according to ICANN, 2023).<br>\n\u2013 DNS should be reviewed regularly after each hosting or domain migration.<\/p><div class=\"wp-block-group has-background\">\n<p><strong>Takeaway:<\/strong> Understanding and checking DNS records regularly helps minimize the risk of website and email disruption \u2013 especially important for small businesses.<\/p>\n<\/div><p><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/00x700.jpg6b33.jpg\" alt=\"Guide to check A record to ensure the website operates stably and quickly\" title=\"\"><\/p><h2 id=\"huong-dan-kiem-tra-a-record-de-dam-bao-website-hoat-dong-on-dinh-va-nhanh-chong\">Guide to check\u2064 A \u200drecord to \u200censure stable and fast website operation<\/h2><h3>What\u200b is an A record\u2063 and why check it?<\/h3><p>\u2013 <strong>A record<\/strong> (Address\u2062 Record) is a DNS record that maps a domain name to the IP address of the web hosting server.<br>\n\u2013 If the A record is misconfigured, the website may fail to load or be unusually slow.<br>\n\u2013 Periodic checks help determine if the IP address is correct and active.<\/p><div class=\"wp-block-group has-background\" style=\"background-color:#f1f1f1;padding:15px;margin:15px 0\">\n  <strong>Tip:<\/strong> \u2063 Always keep the original server IP for comparison after DNS updates.\n<\/div><h3>Steps to accurately check \u2064A record<\/h3><p>Checklist c\u00e1c b\u01b0\u1edbc b\u1ea1n n\u00ean l\u00e0m:<\/p><ul>\n<li>Find out the current server IP (from hosting panel or provider like DPS.MEDIA).<\/li>\n<li>Access DNS checking tools such as: <a href=\"https:\/\/dnschecker.org\" target=\"_blank\" rel=\"nofollow noopener\">DNS \u200cChecker<\/a> or \u2064 <a href=\"https:\/\/mxtoolbox.com\" target=\"_blank\" rel=\"nofollow noopener\">MXToolbox<\/a>.<\/li>\n<li>Enter the domain name to check and select \u201cA Record\u201d.<\/li>\n<li>Use terminal command: <code data-no-translation=\"\">nslookup tenmien.com<\/code> (Windows\/macOS\/Linux).<\/li>\n<li>Compare the returned IP with the expected IP.<\/li>\n<\/ul><h3>Real\u2064 example<\/h3><p>A customer using shared hosting of DPS.MEDIA reported unusually slow website loading. After checking the A record, the domain still pointed to the old IP from the previous provider. After updating to the correct IP, the loading speed nearly doubled (average from 4.2s down to 2.1s according to GTmetrix 2023).<\/p><h3>Template: Valid A record<\/h3><table class=\"WordPress\" style=\"width:100%;border-collapse: collapse\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #ccc;padding: 8px\">Domain Name<\/th>\n<th style=\"border: 1px solid #ccc;padding: 8px\">Record type<\/th>\n<th style=\"border: 1px solid #ccc;padding: 8px\">Returned IP<\/th>\n<th style=\"border: 1px solid #ccc;padding: 8px\">TTL<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ccc;padding: 8px\">example.com<\/td>\n<td style=\"border: 1px solid #ccc;padding: 8px\">A<\/td>\n<td style=\"border: 1px solid #ccc;padding: 8px\">198.51.100.4<\/td>\n<td style=\"border: 1px solid #ccc;padding: 8px\">3600<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>C\u1ea3nh\u200d b\u00e1o r\u1ee7i ro \u2063ph\u1ed5 bi\u1ebfn<\/h3><p>\u2013 Update not yet complete but website already moved \u2192 causes access disruption.<br>\n\u2013 Pointing to wrong IP at many sub-records (www, api, mail) \u2192 SSL authentication errors or lost emails.<br>\n-\u200d Thay \u0111\u1ed5i IP m\u00e0 ch\u01b0a clear \u2063DNS\u200b cache tr\u00ean thi\u1ebft b\u1ecb \u2192\u200d hi\u1ec3u sai tr\u1ea1ng \u200cth\u00e1i website.<\/p><div class=\"wp-block-group has-background\" style=\"background-color:#fffbe6;padding:15px;margin:15px 0\">\n  <strong>Note:<\/strong> DNS c\u00f3 th\u1ec3 \u2063m\u1ea5t \u0111\u1ebfn 24-48 gi\u1edd \u0111\u1ec3 c\u1eadp nh\u1eadt ho\u00e0n to\u00e0n\u200c tr\u00ean to\u00e0n \u200bc\u1ea7u (theo Cloudflare, 2023).\n<\/div><h3>Brief takeaway<\/h3><p>Checking and maintaining correct A records helps websites operate stably, quickly, and avoid unwanted interruptions. Don\u2019t forget to schedule regular checks \u2013 especially when changing hosting providers.<br><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/www.akamai.com\/site\/en\/images\/promo\/2023\/what-is-dns-video.jpg\" alt=\"Tips to verify MX record to help business emails avoid spam and enhance credibility\" title=\"\"><\/p><h2 id=\"meo-xac-minh-mx-record-giup-email-doanh-nghiep-tranh-roi-vao-spam-va-nang-cao-uy-tin\">Tips to verify MX record\u200c help business emails avoid spam \u200band \u200cboost reputation<\/h2><h3>Why MX record affects email \u200creliability\u2064?<\/h3><p>MX\u2063 record\u200b x\u00e1c \u0111\u1ecbnh \u2063m\u00e1y\u2062 ch\u1ee7 n\u00e0o ch\u1ecbu tr\u00e1ch\u200b nhi\u1ec7m nh\u1eadn email cho t\u00ean mi\u1ec1n \u2063c\u1ee7a \u2063b\u1ea1n. \u200cN\u1ebfu c\u1ea5u h\u00ecnh \u2064sai:<\/p><p>\u2013 Outgoing emails are easily marked as spam or rejected.<br>\n-\u200c Uy t\u00edn c\u1ee7a t\u00ean mi\u1ec1n b\u1ecb gi\u1ea3m \u0111i\u1ec3m tr\u00ean c\u00e1c\u2064 h\u1ec7 th\u1ed1ng l\u1ecdc th\u01b0.<br>\n\u2013 Reduces inbox rate, affecting marketing campaigns and customer service.<\/p><p>According to the Cisco Email Security 2023 report, up to \u2063 <strong>72% \u2064email\u200c spam triggered by incorrect MX record configuration of the domain<\/strong>.<\/p><div class=\"wp-block-group has-background\">\n<p><strong>Tip:<\/strong> Always synchronize between MX record and the actual email service (such as Google Workspace, Zoho Mail\u2026)<\/p>\n<\/div><h3>Checklist to verify correct MX\u2063 record<\/h3><p>To\u2064 ensure business emails\u2063 are not\u2063 marked as spam, please check the following:<\/p><ul>\n<li>\u2705 MX points to the correct mail server (e.g., ALT1.ASPMX.L.GOOGLE.COM for Google)<\/li>\n<li>\u2705 No MX \u2064points incorrectly\u2064 to wrong domain (e.g., pointing to old service)<\/li>\n<li>\u2705 SPF, DKIM, DMARC \u200care fully configured<\/li>\n<li>\u2705 Ch\u1ec9 d\u00f9ng m\u1ed9t\u200c d\u1ecbch v\u1ee5 g\u1eedi ch\u00ednh \u0111\u1ec3 tr\u00e1nh xung \u0111\u1ed9t<\/li>\n<\/ul><p>Practical example: A logistics business in Ho Chi Minh City once configured MX to 2 services at the same time (Zoho &amp; Outlook). As a result, <strong>30% \u200bcustomer care emails \u200bwere marked as spam<\/strong>. Sau khi\u2063 tinh ch\u1ec9nh l\u1ea1i c\u1ea5u h\u00ecnh\u2062 v\u00e0 kh\u00f3a domain c\u0169,\u2064 t\u1ef7 l\u1ec7 inbox t\u0103ng 89% (theo \u200ds\u1ed1 \u2064li\u1ec7u n\u1ed9i b\u1ed9).<\/p><h3>How to check current \u2063MX record \u200bof a domain<\/h3><p>You \u2062can \u200duse free lookup tools:<\/p><table class=\"wp-block-table wordpress\">\n<thead>\n<tr>\n<th>Tool<\/th>\n<th>Website<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>MXToolbox<\/td>\n<td><a href=\"https:\/\/mxtoolbox.com\/\" rel=\"nofollow noopener\" target=\"_blank\">mxtoolbox.com<\/a><\/td>\n<\/tr>\n<tr>\n<td>Google\u2062 Admin Toolbox<\/td>\n<td><a href=\"https:\/\/toolbox.googleapps.com\/\" rel=\"nofollow noopener\" target=\"_blank\">toolbox.googleapps.com<\/a><\/td>\n<\/tr>\n<tr>\n<td>DNS Checker<\/td>\n<td><a href=\"https:\/\/dnschecker.org\/\" rel=\"nofollow noopener\" target=\"_blank\">dnschecker.org<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table><div class=\"wp-block-group has-background\">\n<p><strong>Warning:<\/strong> Avoid changing MX records during peak hours or during major email campaigns \u2013 it can cause disruption.<\/p>\n<\/div><h3>Takeaway:<\/h3><p>Ensure <strong>MX record is configured correctly\u200c and\u2064 consistently<\/strong> helps \u2063business emails avoid \u2064spam, improve communication quality\u2063 and maintain brand reputation. Please check regularly every 3\u200b months or \u200dbefore launching large email campaigns.<br><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/595085.jpg\" alt=\"Use effective online tools to check and monitor DNS information quickly\" title=\"\"><\/p><h2 id=\"su-dung-cong-cu-truc-tuyen-hieu-qua-de-kiem-tra-va-theo-doi-thong-tin-dns-nhanh-chong\">Use effective online tools to quickly check\u2064 and monitor DNS information<\/h2><h3>C\u00e1c c\u00f4ng c\u1ee5 ki\u1ec3m tra\u2062 DNS ph\u1ed5 \u200cbi\u1ebfn hi\u1ec7n nay<\/h3><p>To quickly and accurately check domain DNS \u200clookup, you \u200ccan use the following free online tools:<\/p><p>\u2013 <strong>MXToolbox<\/strong>: supports lookup of A record, MX,\u200d CNAME, TXT\u2064 and more.<br>\n\u2013 <strong>ViewDNS<\/strong>: \u2064view WHOIS info, \u200dDNS history,\u2062 reverse IP.<br>\n\u2013 <strong>Google Admin Toolbox<\/strong>: detailed analysis\u200d of record values.<br>\n\u2013 <strong>IntoDNS<\/strong>: check\u2063 DNS server structure \u2063according to ICANN standards.<\/p><div class=\"wp-block-group has-background\">\n<p><strong>Tip:<\/strong> Combining\u200c multiple tools \u2062will help \u200ddetect DNS setup errors more accurately.<\/p>\n<\/div><h3>How to \u2063monitor DNS changes over time<\/h3><p>Monitoring\u200c DNS changes regularly helps detect \u200derrors when\u2064 server configuration\u200c or \u2062due to DNS hijacking attacks.\u2062 You\u200d can:<\/p><p>\u2013 Save the history of A records, MX records after each update.<br>\n\u2013 Use services like DNSSpy or Cloudflare Analytics to monitor fluctuations.<br>\n\u2013 Configure alerts when there are changes to records (A, MX, NS\u2026).<\/p><p>Example: A client of DPS.MEDIA using DNS Monitoring service detected an A record change after the website migrated hosting \u2013 thus avoiding prolonged downtime errors.<\/p><h3>B\u1ea3ng c\u1ea5u h\u00ecnh DNS m\u1eabu<\/h3><table class=\"WordPress\">\n<thead>\n<tr>\n<th>Record type<\/th>\n<th>Domain Name<\/th>\n<th>Value<\/th>\n<th>TTL<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A<\/td>\n<td>example.com<\/td>\n<td>192.0.2.1<\/td>\n<td>3600<\/td>\n<\/tr>\n<tr>\n<td>MX<\/td>\n<td>example.com<\/td>\n<td>mail.example.com (priority 10)<\/td>\n<td>3600<\/td>\n<\/tr>\n<tr>\n<td>TXT<\/td>\n<td>example.com<\/td>\n<td>v=spf1\u200b include:_spf.example.net ~all<\/td>\n<td>3600<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>Quick DNS\u200d check checklist<\/h3><p>\u2013 [ ] Verify A record points to the correct hosting server<br>\n\u2013 [ ] Ensure MX record is compatible with the mail system in use<br>\n\u2013 [ ] Check SPF, DKIM, DMARC configuration if sending emails<br>\n\u2013 [ ] Monitor reasonable TTL to reduce update time<br>\n\u2013 [ ] Use DNS Monitoring to alert for sudden changes<\/p><h3>Th\u00e1ch \u200cth\u1ee9c v\u00e0\u2064 l\u01b0u \u00fd \u2062khi \u2062s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 online<\/h3><p>\u2013 Some tools only show data from cache, not reflecting real-time records. - Confusion may occur when a domain uses multiple distributed DNS servers.<br>\n\u2013 Should combine data from official DNS servers to cross-check results.<\/p><div class=\"wp-block-group has-background\">\n<p><strong>Takeaway:<\/strong> Use flexible \u2064free\u200d DNS\u2062 tools to help you not only check, <a href=\"https:\/\/dps.media\/en\/bulk-dns-lookup-optimal-solution-for-domain-management\/\" rel=\"nofollow\">but also proactively monitor the domain system \u2013 thereby minimizing the risk of business website or email disruption<\/a>.<\/p>\n<\/div><p><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/nahost.jpga6b5.jpg\" alt=\"Notes when updating DNS to avoid service interruptions and impact on customers\" title=\"\"><\/p><h2 id=\"nhung-luu-y-khi-cap-nhat-dns-de-khong-lam-gian-doan-dich-vu-va-anh-huong-den-khach-hang\">Notes when updating DNS\u200d to avoid service interruption and\u2064 impact \u200con customers<\/h2><h3>Understand clearly DNS update time (DNS Propagation)<\/h3><p>\u2013 After changing DNS records, the time for DNS servers worldwide to update can take from 1 to 48 hours.<br>\n-\u200b During this time, some users\u2064 may access the old version, causing inconsistent errors.<br>\n-\u2062 Avoid changing DNS \u200dduring peak hours\u200c or major sale events to \u2063minimize\u2062 impact. \u2063  <\/p><div class=\"wp-block-group has-background\">\n<p><strong>Tip:<\/strong> Reduce\u2062 TTL (Time-To-Live) of records to 300 seconds \u2063at least 24 hours before to \u2064help\u200c shorten update time.<\/p>\n<\/div><h3>Check carefully before\u2064 updating to avoid errors<\/h3><p>\u2013 Back up current DNS records before editing for easy recovery if needed.<br>\n-\u200c Check \u2062A \u200drecord, MX \u2064record\u2062 configuration using\u200d tools like <a href=\"https:\/\/toolbox.googleapps.com\/apps\/dig\/\" rel=\"nofollow noopener\" target=\"_blank\">Google\u200c Toolbox Dig<\/a> or \u2062 <a href=\"https:\/\/mxtoolbox.com\/\" rel=\"nofollow noopener\" target=\"_blank\">MXToolbox<\/a>.- Ensure IP address in \u2064A record is accurate and email is not \u2062intercepted due to incorrect MX record\u2062.<\/p><table class=\"wordpress\">\n<thead>\n<tr>\n<th>Record Type<\/th>\n<th>Purpose<\/th>\n<th>Check<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A Record<\/td>\n<td>Domain name \u2064points to\u2063 IP<\/td>\n<td>ping domain.com<\/td>\n<\/tr>\n<tr>\n<td>MX Record<\/td>\n<td>Sending &amp; receiving email<\/td>\n<td>nslookup -type=MX domain.com<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>Checklist: Things to do before\u200b updating\u200b DNS<\/h3><ul>\n<li>\u2714 Backup current\u200b DNS records<\/li>\n<li>\u2714 Reduce TTL to 300 seconds at least 24 hours before<\/li>\n<li>\u2714 Confirm server IP \u2062and email information<\/li>\n<li>\u2714 \u200bRun tests on\u200d staging environment (if available)<\/li>\n<li>\u2714 Have a recovery plan in\u200b case of errors<\/li>\n<\/ul><h3>V\u00ed\u2062 d\u1ee5 th\u1ef1c t\u1ebf t\u1eeb doanh\u2064 nghi\u1ec7p v\u1eeba<\/h3><p>An online retail company changed the A record\u2063 to point to a new server\u200b but did not reduce TTL beforehand. \u2062The result \u200cis that within\u2062 12 hours, some customers\u200d saw the old website, some could not\u2062 access it. According to\u200c DNS \u2063Performance 2023 report by CatchPoint,\u2063 on average 32% SMB enterprises\u2063 have experienced \u2063DNS issues due to lack of\u2064 preparation.<\/p><div class=\"wp-block-group has-background\">\n<p><strong>Warning:<\/strong> Customers may\u200c lose trust if\u200d the website is not \u200baccessible or \u200delayed email delivery \u200cin a few hours.<\/p>\n<\/div><h3>Takeaway:<\/h3><p><strong>Just a few small changes in DNS configuration,\u200d but lack of\u2062 preparation can cause major interruptions.<\/strong> Be \u2062sure to backup, reduce TTL \u2064and carefully check configuration\u2064 before \u200dproceeding.<br><img decoding=\"async\" class=\"kimage_class\" src=\"https:\/\/dps.media\/wp-content\/uploads\/2025\/08\/802324.jpg\" alt=\"Optimize DNS configuration alongside digital marketing strategies for sustainable business development\" title=\"\"><\/p><h2 id=\"toi-uu-hoa-cau-hinh-dns-song-hanh-cung-chien-luoc-digital-marketing-cho-doanh-nghiep-phat-trien-ben-vung\">Optimize DNS\u2064 configuration alongside digital marketing strategy for sustainable business development<\/h2><h3>Why does DNS directly affect digital strategy?<\/h3><p>DNS configuration not only helps\u2064 the website display stably, but also\u200b affects page load speed -\u200d a key \u2063factor in SEO and user\u2064 experience.  <\/p><p>According to a report \u200cfrom \u2063Google (2023), every second delay in\u200d page load can reduce \u20627% conversion rate. Therefore, a\u2064 business deploying digital marketing effectively must \u200chave\u2062 <strong>DNS operates stably and quickly<\/strong>.<\/p><div class=\"wp-block-group has-background\">\n  \ud83d\udca1 Tips: Regularly ping DNS to check response from the server before each major advertising campaign.\n<\/div><h3>Checklist \u2063t\u1ed1i \u200c\u01b0u \u2063DNS h\u1ed7 tr\u1ee3 ho\u1ea1t \u0111\u1ed9ng marketing<\/h3><p>Businesses can apply the following steps to ensure the DNS system operates effectively:<\/p><ul>\n<li>\u2714 Check that the A record points to the correct IP and has no conflicts<\/li>\n<li>\u2714 Set a reasonable TTL (recommended: 300-600 seconds)<\/li>\n<li>\u2714 Correctly configure MX Record to ensure emails do not go to spam<\/li>\n<li>\u2714 Use DNS from reputable NS such as Cloudflare or Google DNS<\/li>\n<li>\u2714 Monitor DNS uptime via tools like UptimeRobot or DNS Spy<\/li>\n<\/ul><h3>Real example: An SME improves performance after optimizing DNS<\/h3><p>An e-commerce business in the country improved page load speed by 22% and increased user time on site by 18% after migrating the entire DNS region from the hosting provider to a specialized DNS system (according to internal data Q3\/2023).  <\/p><p>The business simultaneously relaunched advertising campaigns after updating SPF\/DKIM records, helping improve marketing email inbox rates to 91%.<\/p><h3>Illustration of basic DNS configuration<\/h3><table class=\"wp-block-table WordPress\">\n<thead>\n<tr>\n<th>Record Type<\/th>\n<th>Sample Value<\/th>\n<th>Purpose<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A<\/td>\n<td>203.113.130.5<\/td>\n<td>Domain points to server IP<\/td>\n<\/tr>\n<tr>\n<td>MX<\/td>\n<td>mail.yourdomain.com<\/td>\n<td>Handle business emails<\/td>\n<\/tr>\n<tr>\n<td>TXT<\/td>\n<td>\u201cv=spf1 include:spf.mailprovider.com\u201d<\/td>\n<td>Email authentication, anti-spoofing<\/td>\n<\/tr>\n<\/tbody>\n<\/table><h3>Nh\u1eefng \u200dr\u1ee7i \u2062ro khi b\u1ecf \u2062qua c\u1ea5u h\u00ecnh\u200d DNS \u0111\u00fang c\u00e1ch<\/h3><ul>\n<li>\u26d4 Website is prone to downtime or incorrect redirects if DNS is not updated correctly<\/li>\n<li>\u26d4 Email cannot be sent or is blacklisted if SPF\/DKIM is missing<\/li>\n<li>\u26d4 Loss of traffic due to slow load speed causing high bounce rate<\/li>\n<\/ul><div class=\"wp-block-group has-background\">\n<p>  \u26a0\ufe0f Warning: Many SMEs only detect DNS errors when the advertising campaign is already active \u2013 after having lost a significant budget.\n<\/p><\/div><h3>Brief takeaway<\/h3><p><strong>DNS Configuration<\/strong> Not only the responsibility of IT but should be considered a technical foundation running alongside all plans <strong>digital marketing<\/strong>. Investing time to optimize DNS will help businesses operate more stably, communicate more effectively, and develop sustainably in the long term. <\/p><h2 id=\"outro\">Looking back at the journey<\/h2><p>Checking domain DNS, A record, and MX record helps ensure the system operates stably. This is a foundational step to build an effective online strategy.<\/p><p>Try checking the records of your website. With just a few simple actions, you will better control domain operations.<\/p><p>Do not overlook key topics like CDN, CNAME, or SPF records. These are important pieces in security and optimizing user experience.<\/p><p>Do you have questions or useful DNS checking tips? Share with DPS.MEDIA in the comments to exchange and learn together! <\/p>","protected":false},"excerpt":{"rendered":"<p>Discover how to check DNS domain names, A records, and MX records in a simple way, helping you clearly understand website and email configuration information in just a few basic steps \u2013 fast, effective, and easy to perform for all users.<\/p>","protected":false},"author":3,"featured_media":29464,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[70],"tags":[457,680],"class_list":["post-29463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc","tag-cong-nghe","tag-huong-dan-ky-thuat"],"acf":[],"rankmath_keywords":{"primary":"","secondary":[""]},"yoast_keywords":{"primary":"","secondary":[]},"yoast_focuskw":"","rankmath_focuskw":"","seo_keywords":{"primary":"","secondary":[""]},"_links":{"self":[{"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/posts\/29463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/comments?post=29463"}],"version-history":[{"count":0,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/posts\/29463\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/media\/29464"}],"wp:attachment":[{"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/media?parent=29463"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/categories?post=29463"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dps.media\/en\/wp-json\/wp\/v2\/tags?post=29463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}