{"id":22097,"date":"2022-08-29T00:00:00","date_gmt":"2022-08-29T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/white-label-dns-reverso-ola-meu-nome-e\/"},"modified":"2026-09-15T18:18:27","modified_gmt":"2026-09-15T18:18:27","slug":"white-label-dns-reverso-ola-meu-nome-e","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/white-label-dns-reverso-ola-meu-nome-e\/","title":{"rendered":"White label de DNS reverso: como funciona"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The Domain Name System (DNS) is about as old as the internet itself, and it\u2019s easy to understand why. Domain names, like <i>mailgun.com<\/i>, are way easier to memorize and remember than <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/ips-dedicados-compartilhados-qual-usar\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Internet Protocol (IP) addresses<\/a> like <code>123.45.67.89<\/code>.<\/p>\n\n<p class=\"wp-block-paragraph\">Could you imagine remembering the IP address of every site you visit? That\u2019d require superpowers.<\/p>\n\n<p class=\"wp-block-paragraph\">With a DNS lookup, you query the DNS server to locate the IP address. However, DNS isn\u2019t only about translating domain names into IP addresses. When we talk about DNS, we want to look at how it affects your email program\u2019s health and <a href=\"https:\/\/www.mailgun.com\/blog\/email\/email-security-best-practices\/\" target=\"_tabs\" rel=\"noopener noreferrer\">cybersecurity<\/a>, like your <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/domain-ip-reputation-gmail-care-more-about\/\" target=\"_tabs\" rel=\"noopener noreferrer\">domain and IP reputations<\/a>. After all, DNS also directs internet traffic like email and SIP voice\/video and allows domain verification and ownership. It also <b>permits senders like Mailgun to send messages on behalf of their customers<\/b>. This last part is significant.<\/p>\n\n<p class=\"wp-block-paragraph\">Let\u2019s say an email marketer uses an email service provider (ESP) like Mailgun to send your company\u2019s email marketing campaigns. Wouldn\u2019t it be better if the email wasn\u2019t labeled \u201cSent by Mailgun.com\u201d? After all, marketing emails are all about making your brand recognizable.<\/p>\n\n<p class=\"wp-block-paragraph\">Good news: You can do this by setting up proper reverse DNS (rDNS) records. In this article, we\u2019ll talk about what rDNS is, why it\u2019s important, some common mistakes, and how you can set up rDNS records with Mailgun.<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-9606\"><p class=\"h5 m-0\" id=\"toc-title-9606\">\u00cdndice<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-reverse-dns-rdns\">What is reverse DNS (rDNS)?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#why-is-rdns-important\">Why is rDNS important?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-are-some-common-rdns-mistakes\">What are some common rDNS mistakes?<\/a><a class=\"scrollme link-body-color\" href=\"#what-is-a-pointer-ptr-record\">What is a pointer (PTR) record?<\/a><a class=\"scrollme link-body-color\" href=\"#why-does-the-hostname-need-to-be-properly-mapped-to-the-ip-address\">Why does the hostname need to be properly mapped to the IP address?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#can-i-set-up-rdns-records-with-mailgun\">Can I set up rDNS records with Mailgun?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-do-i-set-up-rdns-with-mailgun\">How do I set up rDNS with Mailgun?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">06<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#wrapping-up\">Wrapping up<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is reverse DNS (rDNS)?<\/h2>\n\n<p class=\"wp-block-paragraph\">Reverse DNS (rDNS) is the opposite of a regular DNS query. Instead of querying the DNS server or DNS name to find an IP address, <b>a reverse DNS lookup queries the given IP address to find the hostname<\/b>. Even though some differences exist between an IPv4 address and an IPv6 address, the process is generally the same.<\/p>\n\n<p class=\"wp-block-paragraph\">In other words, reverse DNS works by resolving the sending email server IP address into its hostname, like <i>example.com<\/i>. By doing so, the rDNS determines that the IP address is connected to an authentic domain name. This is important: If your marketing team uses an ESP like Mailgun, <b>you can set up rDNS records to display your company as the sender<\/b> instead of \u201cSent by Mailgun.com.\u201d For instance, an rDNS entry of <code>m123-456.yourwebdomain.com<\/code> will show the sender as you to inbox service providers (ISPs).<\/p>\n\n<p class=\"wp-block-paragraph\">We covered something similar with masking the <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/white-label-registros-dns-clientes-dicas-truques\/\" target=\"_tabs\" rel=\"noopener noreferrer\">CNAME of mailgun.org in your DNS<\/a>, but this is a bit different. In this instance, we\u2019re only talking about the rDNS of your dedicated IP for sending.<\/p>\n\n<h2 class=\"wp-block-heading\">Why is rDNS important?<\/h2>\n\n<p class=\"wp-block-paragraph\">We\u2019ve talked about how rDNS can improve your email program by displaying your company as the sender to ISPs. Now, let\u2019s dig into why this is important:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Email servers might reject incoming messages from any IP address that does not have rDNS. This is to discourage spammers. As you can imagine, this will <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/deliverability\/melhorar-taxa-entrega-e-mail\/\" target=\"_tabs\" rel=\"noopener noreferrer\">affect your deliverability<\/a> if you get caught in the spam filter.<\/li>\n\n\n\n<li>You can use rDNS to reinforce your brand recognition. Instead of having an email be \u201cSent by (your ESP),\u201d your messages will appear to be sent from you directly.<\/li>\n\n\n\n<li>Outside of email, you can use rDNS lookup to track visitors to your webpage.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">What are some common rDNS mistakes?<\/h2>\n\n<p class=\"wp-block-paragraph\">Before we get into setting up rDNS records, let\u2019s look at some common rDNS mistakes. Specifically, we\u2019ll focus on:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The pointer record<\/li>\n\n\n\n<li>The hostname returned resolves to a different IP address than the original hostname<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">What does this all mean? Let\u2019s dive into each of these below.<\/p>\n\n<h3 class=\"wp-block-heading\">What is a pointer (PTR) record?<\/h3>\n\n<p class=\"wp-block-paragraph\">A PTR record is part of a package of information (A, MX, CNAME, etc.) tied to your IP address and stored with your hosting provider. Your server uses the PTR record to check that the mail server sending the email matches the IP address the message claims to be sent from. In short, <b>a PTR record facilitates an rDNS lookup.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/mxtoolbox.com\/ReverseLookup.aspx\" target=\"_tabs\" rel=\"noopener noreferrer\">Check that your PTR record is set up correctly<\/a> and returns a hostname for the IP address that\u2019s being queried.<\/p>\n\n<h3 class=\"wp-block-heading\">Why does the hostname need to be properly mapped to the IP address?<\/h3>\n\n<p class=\"wp-block-paragraph\">The hostname that\u2019s being queried must resolve back to the same IP address. The goal is that the IP address points to the hostname and that the hostname points to the IP address. <b>It\u2019s easy to do the second part wrong<\/b>, which causes rDNS lookup to fail.<\/p>\n\n<p class=\"wp-block-paragraph\">For example, suppose your IP is <code>8.8.8.8<\/code>, and you\u2019ve set the PTR record to return <code>mail.yourwebsite.com<\/code>. But, when you use rDNS to look up <code>mail.yourwebsite.com<\/code>, the IP address returns as <code>9.9.9.9<\/code> instead of <code>8.8.8.8<\/code>. Or, worse, the hostname doesn\u2019t resolve at all.<\/p>\n\n<p class=\"wp-block-paragraph\">To fix the problem, you would have to make sure that <code>mail.yourwebsite.com<\/code> resolves to <code>8.8.8.8<\/code>.<\/p>\n\n<h2 class=\"wp-block-heading\">Can I set up rDNS records with Mailgun?<\/h2>\n\n<p class=\"wp-block-paragraph\">At Mailgun, we can create IP addresses for dedicated sending that are assigned to only sending outgoing emails. These IP addresses resolve in reverse to hostnames at a domain that belongs to us. We can also set up rDNS records for your dedicated IPs to make it look like you\u2019re sending from yourself directly rather than from Mailgun.<\/p>\n\n<p class=\"wp-block-paragraph\">Wait, really? Yes, we can create custom PTR records for you so that the rDNS record of a connecting IP represents the message.<\/p>\n\n<p class=\"wp-block-paragraph\">What this means is that everything sends the same way as always. The only difference is that <b>the message looks like it\u2019s coming from you<\/b> directly rather than through a service like Mailgun.<\/p>\n\n<p class=\"wp-block-paragraph\">Ready to get started? Read on to learn how.<\/p>\n\n<h2 class=\"wp-block-heading\">How do I set up rDNS with Mailgun?<\/h2>\n\n<p class=\"wp-block-paragraph\">Before we dive in, keep in mind that <b>this can\u2019t be done with shared IPs <\/b>since rDNS can only resolve for one hostname. However, if you\u2019re using a dedicated IP, it adds a nice added polish to your messages. And it doesn\u2019t hurt with inbox providers either if you have a good reputation.<\/p>\n\n<p class=\"wp-block-paragraph\">Follow the steps below to get set up:<\/p>\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.mailgun.com\/pt\/contato\/suporte\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Get in touch with Mailgun<\/a>, and we\u2019ll provide you with an \u201cA record.\u201d<\/li>\n\n\n\n<li>Input the \u201cA record\u201d into your zone file at your hosting provider. An \u201cA record\u201d will look something like this: <code><i>A, mail.customer.com, 123.45.67.89<\/i><\/code><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mailgun.com\/pt\/contato\/suporte\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Submit a ticket to our support team<\/a>, and we\u2019ll update the PTR record on our end to match the hostname you\u2019re using.<\/li>\n<\/ol>\n\n<h2 class=\"wp-block-heading\">Wrapping up<\/h2>\n\n<p class=\"wp-block-paragraph\">Set up your rDNS record with Mailgun today and get sending. Want to learn more ways to superpower your email program game? Check out our tips for <a href=\"https:\/\/www.mailgun.com\/pt\/blog\/email\/os-beneficios-da-automacao-de-e-mail\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email automation<\/a>. Or are you intrigued about securing your email process? Learn how to <a href=\"https:\/\/www.mailgun.com\/blog\/it-and-engineering\/email-gateway-holes\/\" target=\"_tabs\" rel=\"noopener noreferrer\">secure email gateway holes<\/a>.<\/p>\n    <div data-content-type=\"longform\" class=\"longform-spacings\">\r\n        <div class=\"cta bg-primary rounded-lg px-5 py-6 p-md-7 px-md-6\">\r\n                    <div class=\"form-subscription\">\r\n                            <div class=\"h4 mb-3\">\r\n                    Keep me posted! Get great resources in your inbox every week.                <\/div>\r\n                                    <form accept-charset=\"UTF-8\" action=\"\" enctype=\"multipart\/form-data\" data-form-subscription method=\"POST\" style=\"max-width: 400px;\">\r\n                <div class=\"row justify-content-between align-items-top g-2\">\r\n                    <div class=\"col-10\">\r\n                        <input type=\"email\" name=\"email\" class=\"form-control\" placeholder=\"Email\" autocomplete=\"email\" required>\r\n                        <div data-fs=\"error\" role=\"alert\" class=\"invalid-feedback\">\r\n                            Please complete this required field.                        <\/div>\r\n                    <\/div>\r\n                                            <div class=\"col-12 order-last mt-3 fs-xxs\" data-fs=\"acceptance\" style=\"display:none;\">\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-terms-2019\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"terms\">\r\n                                    <label for=\"formSubscriptionAcceptance-terms-2019\" class=\"form-check-label text-body-color\">\r\n                                        I have read and agree to the Terms of Service.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-privacy-5161\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"privacy\">\r\n                                    <label for=\"formSubscriptionAcceptance-privacy-5161\" class=\"form-check-label text-body-color\">\r\n                                        I have read and agree to the Privacy Policy.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                                                    <\/div>\r\n                    \r\n                                            <div class=\"col-12 order-last fs-xxs mb-0 mt-2 text-body-color\">\r\n                            Send me the Mailjet Newsletter. I expressly agree to receive the newsletter and know that I can easily unsubscribe at any time.                        <\/div>\r\n                    \r\n                    <div class=\"col-2\">\r\n                        <button type=\"submit\" value=\"Submit\" aria-label=\"Submit\" class=\"btn btn-secondary btn-icon\">\r\n                            <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/layout\/chevron-right.svg\"><\/svg>\r\n                        <\/button>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <input type=\"hidden\" name=\"formSubscriptionRecaptchaToken\" data-fs=\"recaptcha-token\">\r\n                <input type=\"hidden\" name=\"customListID\" value=\"\">\r\n\r\n            <\/form>\r\n            <div data-fs=\"message-success\" style=\"display: none;\">\r\n                <p class=\"mb-0 mt-2 text-body-color\">\r\n                    Check your inbox monthly for your Mailjet Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Quando um destinat\u00e1rio abre seu e-mail, voc\u00ea prefere que ele diga &#8220;Enviado por Mailgun&#8221; ou que o nome da sua empresa seja exibido? Ao configurar o DNS reverso (rDNS), voc\u00ea pode instruir os provedores de caixa de correio a fazerem isso com os benef\u00edcios adicionais de entregabilidade e rastreamento.<\/p>\n","protected":false},"author":41,"featured_media":4376,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-22097","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-deliverability"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Exiba sua marca como o remetente de e-mail com DNS reverso (rDNS) - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Use o DNS reverso (rDNS) para adicionar white label ao seu envio de e-mail e promover o reconhecimento da marca. 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