{"id":21680,"date":"2026-01-26T17:57:45","date_gmt":"2026-01-26T17:57:45","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/implementar-dmarc\/"},"modified":"2026-09-15T13:57:39","modified_gmt":"2026-09-15T13:57:39","slug":"implementar-dmarc","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/implementar-dmarc\/","title":{"rendered":"C\u00f3mo implementar DMARC \u2013 Una gu\u00eda paso a paso"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Email spoofing is rampant across the internet. Fraudulent emails come in the form of scams, ransomware, and even <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/\">stock-market manipulation<\/a><a href=\"https:\/\/www.reuters.com\/article\/us-fingerprint-samsung-idUSBRE99A07N20131011\" target=\"_tabs\" rel=\"noopener noreferrer\">. <\/a>We see companies lose millions of dollars every year to malicious hackers \u2013 <a href=\"https:\/\/www.mailgun.com\/es\/blog\/email-security-best-practices\/\" target=\"_tabs\" rel=\"noopener noreferrer\">not even charities are safe<\/a>. Even if you\u2019re a domain owner and set up <a href=\"https:\/\/www.mailgun.com\/es\/blog\/understanding-dkim-how-it-works\/\" target=\"_tabs\" rel=\"noopener noreferrer\">strict email security,<\/a> your \u201cfrom\u201d address can still be spoofed without DMARC.<\/p>\n\n<p class=\"wp-block-paragraph\">But what is DMARC and why is it so important? In this post, we\u2019ll share all you need to know about this email authentication and the steps you need to take to implement it.<\/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-5032\"><p class=\"h5 m-0\" id=\"toc-title-5032\">\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-dmarc\">What is DMARC?<\/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-dmarc-so-important\">Why is DMARC so 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=\"#how-does-dmarc-work\">How does DMARC work?<\/a><a class=\"scrollme link-body-color\" href=\"#before-dmarc-utilizing-spf-and-dkim\">Before DMARC: Utilizing SPF and DKIM<\/a><a class=\"scrollme link-body-color\" href=\"#during-dmarc-breaking-down-the-record\">During DMARC: Breaking down the record<\/a><a class=\"scrollme link-body-color\" href=\"#after-dmarc-reviewing-dmarc-reports\">After DMARC: Reviewing DMARC reports<\/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=\"#dmarc-and-deliverability\">DMARC and deliverability\u00a0<\/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-to-set-up-dmarc\">How to set up DMARC<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_1-prepare-your-domain-before-you-set-up-dmarc\">1. Prepare your domain before you set up DMARC<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_2-choose-a-policy\">2. Choose a policy<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_3-publish-your-txt-record\">3. Publish your TXT record<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_4-analyze-your-reports\">4. Analyze your reports<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_5-roll-out-your-strategy-slowly\">5. Roll out your strategy slowly<\/a><a class=\"scrollme link-body-color\" href=\"#anchor_6-monitor-your-authentication-success-rate\">6. Monitor your authentication success rate<\/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=\"#use-dmarc-with-mailgun\">Use DMARC with Mailgun\u00a0<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is DMARC?<\/h2>\n\n<p class=\"wp-block-paragraph\">Take a deep breath \u2013 this acronym is a long one.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an authentication method designed to stop bad actors from impersonating you.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">Developed in 2012, DMARC has become an industry-standard practice and is your first line of defense against malicious emails on your sender program.<b>\u00a0<\/b>Not sure if you already have DMARC set up?\u00a0<a href=\"https:\/\/dmarcian.com\/dmarc-inspector\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Use this tool to perform a quick DMARC check<\/a>.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">Why is DMARC so important?<\/h2>\n\n<p class=\"wp-block-paragraph\">While email is as old as the internet itself, email authentication is an unfolding process. Before DMARC, inbox providers like Google relied on strict filters and user feedback to identify spammers. So strict, in fact, it could block out legitimate senders and email domains.<\/p>\n\n<p class=\"wp-block-paragraph\">Using DMARC, a sender can analyze feedback loop reports to develop a strict authentication protocol that tells receiving mail servers which IPs on your domain are yours.\u00a0<b>A DMARC policy will instruct ISPs to reject emails from fraudulent IPs that are attempting to use your domain.\u00a0<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">That all sounds great, but why bother if your emails are currently getting through to the inbox just fine? The answer is twofold starting with <b><i>security<\/i><\/b>. <a href=\"https:\/\/dmarcian.com\/why-dmarc\/\" target=\"_tabs\" rel=\"noopener noreferrer\">90% of network attacks are carried out through email infrastructure<\/a> and are becoming increasingly sophisticated. <b>Your ISP reputation, deliverability rates, and brand reputation are all severely damaged in the case of a phishing attack. <\/b>DMARC helps protect your users and your sender identity.<\/p>\n\n<p class=\"wp-block-paragraph\">The second reason is DMARC is now a requirement for bulk senders \u2013 at least for those who are sending messages to Gmail or Yahoo mailboxes. These mailbox providers announced in October 2023 that they would be holding senders to stricter standars, including more robust authentications. That means DMARC.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <p class=\"mb-0\">Learn more: We\u2019ve broken down everything you need to know about 2024&#8217;s Gmail and Yahoo inbox changes. Dive deeper with our post: <a href='https:\/\/www.mailgun.com\/blog\/deliverability\/gmail-and-yahoo-inbox-updates-2024\/'>Gmail and Yahoo\u2019s 2024 inbox protections and what they mean for your email program.<\/a><\/p><\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">How does DMARC work?<\/h2>\n\n<p class=\"wp-block-paragraph\">Simply put,\u00a0<b>DMARC is a line of code that goes into your DNS TXT record.<\/b>\u00a0Yet DMARC is so much more than code \u2013 it\u2019s a process that takes place before, during, and after implementation to ensure your email system continues to run smoothly.<b>\u00a0<\/b>Let\u2019s run through three key components of DMARC to understand this authentication standard better.<\/p>\n\n<h3 class=\"wp-block-heading\">Before DMARC: Utilizing SPF and DKIM<\/h3>\n\n<p class=\"wp-block-paragraph\">To understand DMARC, we first need to understand its predecessors,\u00a0<a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Sender Policy Framework (SPF)<\/a>\u00a0and\u00a0<a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/entender-dkim-como-funciona\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DomainKeys Identified Mail (DKIM).<\/a>\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">SPF is an authentication method for senders to publish the IPs of trusted SMTP servers that are allowed to send from a domain. The receiving server then cross-checks this record to validate the email and send it to the inbox. DKIM authentication, on the other hand, is a signature that goes into your public DNS records, verified with a private key in your email header.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">Why are these so important to DMARC? Because\u00a0<b>DMARC passes or fails a message based on the alignment of SPF and DKIM.\u00a0<\/b><\/p>\n\n<h3 class=\"wp-block-heading\">During DMARC: Breaking down the record<\/h3>\n\n<p class=\"wp-block-paragraph\">A DMARC record is compiled of relatively straightforward tags and values. Only two fields are required, and the rest are optional.\u00a0<b>In this post, we will cover the minimum requirements.\u00a0<\/b>However,\u00a0<a href=\"https:\/\/support.google.com\/a\/answer\/2466563\" target=\"_tabs\" rel=\"noopener noreferrer\">Google has a list with all the advanced tags<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">Here is an example of a simple DMARC record:<\/p>\n\n<p class=\"wp-block-paragraph\">v=DMARC1; p=reject; rua=mailto:postmaster@example.com;<\/p>\n\n<p class=\"wp-block-paragraph\">The first tag\u00a0<code><b>v=<\/b><\/code>\u00a0is easy. It must always be\u00a0<code><b>DMARC1<\/b><\/code>. There are no other versions at the moment, so always use\u00a0<b><code>1<\/code><\/b>.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">The second tag\u00a0<code><b>p=<\/b><\/code>\u00a0is an instruction to the recipient&#8217;s email server for emails that do not pass authentication. Here are your options:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><code><b>None<\/b><\/code><b>:\u00a0<\/b>Log the entry but take no action.<\/li>\n\n\n\n<li><code><b>Quarantine<\/b><\/code><b>:\u00a0<\/b>Mark as spam.<\/li>\n\n\n\n<li><code><b>Reject<\/b><\/code><b>:\u00a0<\/b>Bounce the email message.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/bimi-mas-que-un-nombre-divertido\/\" target=\"_tabs\" rel=\"noopener noreferrer\">If you are using BIMI<\/a>, the\u00a0<code>p= <\/code>tag must be set to\u00a0<code><b>quarantine<\/b><\/code>\u00a0or\u00a0<code><b>reject<\/b><\/code>\u00a0as BIMI does not support\u00a0<code><b>none<\/b><\/code>.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">The third tag is\u00a0<code><b>rua=<\/b><\/code>\u00a0or Report Email Address. This is the dedicated mailbox where your DMARC reports are sent.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">If you don\u2019t want to compile the record yourself,\u00a0<a href=\"https:\/\/dmarcian.com\/dmarc-record-wizard\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Dmarcian has a free DMARC record generator wizard<\/a>.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> We sat down with Dmarcian to dive into their take on 2024 inbox changes and the importance of DMARC. Check out what they had to say in <a href='https:\/\/www.mailgun.com\/blog\/deliverability\/dmarc-insights-from-dmarcian\/'>our post and podcast on DMARC explained.<\/a><\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">After DMARC: Reviewing DMARC reports<\/h3>\n\n<p class=\"wp-block-paragraph\">Finally, we have the reporting stage of DMARC. Once DMARC has been successfully implemented, reports will begin flying into your assigned inbox. These reports will tell you:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Which servers or third parties are sending mail from your domain and if they pass or fail.<\/li>\n\n\n\n<li>How each receiving mail server reacts to unauthenticated messages.<\/li>\n\n\n\n<li>The total DMARC pass rate percentage.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">An optional reporting tag\u00a0<code><b>ruf=<\/b><\/code><b>\u00a0<\/b>tells ISPs where to return fail or forensic reports. While this tag is not supported by all mailbox providers for data reasons (Gmail, we\u2019re looking at you\u2026), it can give you\u00a0<a href=\"https:\/\/www.dmarcanalyzer.com\/forensic-dmarc-reports-explained\/\" target=\"_tabs\" rel=\"noopener noreferrer\">more insights into the email content that failed<\/a>\u00a0compared to a standard aggregate report.<\/p>\n\n<p class=\"wp-block-paragraph\">The results of these reports will help you pivot your DMARC policy. For example, if most messages are passing through the email receiver\u2019s mail servers, you will need a stricter policy to catch spoofers. Each day, you will need to<b>\u00a0analyze your reports and\u00a0<\/b><a href=\"https:\/\/support.google.com\/a\/answer\/10032578\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>troubleshoot any issues<\/b><\/a><b>\u00a0that you come across<\/b>, like legitimate emails being sent to the spam folder. Now that we have a better understanding of DMARC, let\u2019s go over a checklist of steps to implement it.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Learn more: Have you already implemented DMARC? Once you have, you\u2019re elligible for BIMI (Brand Indicators for Message Identification,) If you\u2019re looking for a way to stand out in the inbox, this is it. <a href='https:\/\/www.mailgun.com\/es\/blog\/deliverability\/bimi-mas-que-un-nombre-divertido\/'>Read our guide.<\/a><\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">DMARC and deliverability\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">If you&#8217;re serious about improving deliverability, DMARC implementation isn\u2019t optional\u2014it\u2019s essential. Strong authentication checks help protect your brand, and they start with a clear understanding of DMARC authentication protocols. Whether you&#8217;re reviewing DMARC aggregate data or digging into failure reports, the goal is the same: make sure your messages land in the inbox, not the junk folder.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">That\u2019s why we\u2019ve partnered with Red Sift. By combining their domain protection platform with Mailgun\u2019s powerful email service, we\u2019re making DMARC implementation faster, simpler, and smarter. From setup to enforcement, you\u2019ll get end-to-end support, complete visibility into DMARC authentication outcomes, and clear insights from your aggregate and failure reports. This partnership helps you meet today\u2019s security standards without slowing down your send\u2014or your team.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">How to set up DMARC<\/h2>\n\n<p class=\"wp-block-paragraph\">Wondering how to configure DMARC? Here\u2019s a detailed guide to help you implement it.<\/p>\n\n<h3 class=\"wp-block-heading\">1. Prepare your domain before you set up DMARC<\/h3>\n\n<p class=\"wp-block-paragraph\">We know you\u2019re eager to roll out your new DMARC policy, but there is some preparation you need to undertake first.\u00a0<\/p>\n\n<h4 class=\"wp-block-heading\">Set up SPF and DKIM for your domain<\/h4>\n\n<p class=\"wp-block-paragraph\">As mentioned above,\u00a0<b>you must have SPF and DKIM activated in order to run DMARC<\/b>.<\/p>\n\n<p class=\"wp-block-paragraph\">For SPF, this requires adding a\u00a0<a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DNS TXT record<\/a>\u00a0found within your ESP settings to your DNS provider. For DKIM signatures, the process is similar \u2013\u00a0copy the\u00a0<a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/entender-dkim-como-funciona\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DKIM record\u00a0<\/a>from your ESP and paste it in your TXT DNS file in the settings of your DNS provider.\u00a0<\/p>\n\n<h4 class=\"wp-block-heading\">Set up a group or mailbox for reports<\/h4>\n\n<p class=\"wp-block-paragraph\"><b>XML reports that track emails to every location and ISP are going to pile up quickly.<\/b>\u00a0So you\u2019re going to need a mailbox that\u2019s independent of other functioning addresses. For small companies, this may be a few and for a large organization, a few thousand. Consider using a\u00a0<a href=\"https:\/\/dmarcian.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">third-party service<\/a>\u00a0to manage and decode these reports.\u00a0<\/p>\n\n<h4 class=\"wp-block-heading\">Audit your sending domains<\/h4>\n\n<p class=\"wp-block-paragraph\">Even a chess prodigy would struggle to remember a list of IP addresses. So when your DMARC reports begin to roll in,\u00a0<b>you\u2019re going to want a list of your sending domains handy so that you can identify the fake from the familiar.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">A domain management function is a process of auditing your domains. Doing this step first will save you a lot of time and headaches, especially for larger organizations that require cross-collaboration between teams. Luckily, our\u00a0<a href=\"https:\/\/dmarcian.com\/videos-on-all-things-dmarc\/\" target=\"_tabs\" rel=\"noopener noreferrer\">friends over at Dmarcian<\/a>\u00a0have created a handy video about DMARC project management.<\/p>\n\t<div class=\"custom-video\">\r\n\t\t\t\t\t                    <div class=\"iframe-responsive-container lazy-video rounded-lg overflow-hidden \">\r\n                <a href=\"https:\/\/www.youtube.com\/watch?v=4jUcAvTMp0Y\" class=\"lazy-video-link\" data-lazy-video=\"4jUcAvTMp0Y\" target=\"_blank\" rel=\"nofollow\" role=\"button\" data-source=\"youtube\" data-language=\"es\" data-thumb=\"https:\/\/img.youtube.com\/vi\/4jUcAvTMp0Y\/maxresdefault.jpg\" title=\"V\u00eddeo de Sinch\">\r\n                    <div class=\"btn btn-light btn-light-social btn-play btn-play-circle\">\r\n                                                    <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/play.svg\"><\/svg>\r\n                                            <\/div>\r\n                    <img decoding=\"async\"  src=\"https:\/\/img.youtube.com\/vi\/4jUcAvTMp0Y\/maxresdefault.jpg\" alt=\"DMARC - Deployment Process\">\r\n                <\/a>\r\n            <\/div>\r\n                        <script type=\"application\/ld+json\">\r\n            {\n    \"@context\": \"http:\/\/schema.org\",\n    \"@type\": \"VideoObject\",\n    \"@id\": \"https:\/\/www.youtube.com\/watch?v=4jUcAvTMp0Y#VideoObject\",\n    \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/4jUcAvTMp0Y\/maxresdefault.jpg\",\n    \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/4jUcAvTMp0Y\",\n    \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=4jUcAvTMp0Y\",\n    \"name\": \"DMARC - Deployment Process\",\n    \"description\": \"Deploy DMARC efficiently by using dmarcian's own deployment process.  Learn how to approach and structure the deployment project to maximize the benefits of DMARC while getting the work done as quickly as possible.\\n\\nTranscript: https:\/\/dmarcian.com\/video-dmarc-deployment-process\/\\n\\nPart of our https:\/\/dmarcian.com\/news-and-knowledge\/ base.\\n\\nFor more visit our website: https:\/\/dmarcian.com\\n\\n#dmarc #deployment  #dmarcian\",\n    \"uploadDate\": \"2015-12-07T16:45:20+00:00\",\n    \"duration\": \"PT6M23S\"\n}        <\/script>\r\n        \t\t\r\n\t\t\t<\/div>\r\n\r\n\t\r\n\n<h3 class=\"wp-block-heading\">2. Choose a policy<\/h3>\n\n<p class=\"wp-block-paragraph\">Before DMARC, it was up to mailbox providers to decide your email\u2019s fate. Now email senders can take the steering wheel by defining their authentication policy. Aka, what action should Microsoft take when a message from your domain name does not match the DMARC record. Imagine your policy is a traffic light system with the aim to move your policy from green (<code><b>none<\/b><\/code>) to orange (<code><b>quarantine<\/b><\/code>) to finally red (<code><b>reject<\/b><\/code>). While a policy of p=none is a great start for testing DMARC, you shouldn\u2019t stop there, as Mailgun\u2019s deliverability experts Kate Nowrouzi and Jonathan Torres explain in this video.<\/p>\n\t<div class=\"custom-video\">\r\n\t\t\t\t\t                    <div class=\"iframe-responsive-container lazy-video rounded-lg overflow-hidden \">\r\n                <a href=\"https:\/\/www.youtube.com\/watch?v=S7i4NoL384k\" class=\"lazy-video-link\" data-lazy-video=\"S7i4NoL384k\" target=\"_blank\" rel=\"nofollow\" role=\"button\" data-source=\"youtube\" data-language=\"es\" data-thumb=\"https:\/\/img.youtube.com\/vi\/S7i4NoL384k\/maxresdefault.jpg\" title=\"V\u00eddeo de Sinch\">\r\n                    <div class=\"btn btn-light btn-light-social btn-play btn-play-circle\">\r\n                                                    <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/sinch\/play.svg\"><\/svg>\r\n                                            <\/div>\r\n                    <img decoding=\"async\"  src=\"https:\/\/img.youtube.com\/vi\/S7i4NoL384k\/maxresdefault.jpg\" alt=\"Is your DMARC policy effective? The problem with p=none\">\r\n                <\/a>\r\n            <\/div>\r\n                        <script type=\"application\/ld+json\">\r\n            {\n    \"@context\": \"http:\/\/schema.org\",\n    \"@type\": \"VideoObject\",\n    \"@id\": \"https:\/\/www.youtube.com\/watch?v=S7i4NoL384k#VideoObject\",\n    \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/S7i4NoL384k\/maxresdefault.jpg\",\n    \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/S7i4NoL384k\",\n    \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=S7i4NoL384k\",\n    \"name\": \"Is your DMARC policy effective? The problem with p=none\",\n    \"description\": \"Results from a new industry survey suggest a DMARC policy of p=none is the most popular choice among email senders. But is it the right choice? Our email deliverability experts suggest keeping your DMARC policy at p=none is a big mistake and a missed opportunity. \\n\\nRecently, Google and Yahoo began requiring senders to use DMARC with a minimum policy of p=none. But the truth is \\u2013 that\\u2019s only the first step towards improving email authentication practices. DMARC with a p=none policy leaves your domain vulnerable to spoofing and phishing attacks, which can harm your sender reputation and reduce inbox placement. DMARC was designed to combat these issues, but unless you\\u2019re using stricter policies, your domain remains could be used for malicious purposes.  \\n\\nThat\\u2019s why even though original research from Sinch Mailgun shows an 11% increase in DMARC adoption, we believe senders need to take things further. \\n\\nThere\\u2019s a reason to use the p=none policy in the beginning, but it shouldn\\u2019t stay that way. Find out why a p=none policy has no teeth and why senders should strongly consider updating their DMARC policy to p=quarantine or p=reject if they want to protect their subscribers and do what\\u2019s best for the future of email. Check out this video to learn more about different DMARC policies. \\n\\nSee how other senders are implementing DMARC policies in results of a global survey: \\nhttps:\/\/www.mailgun.com\/resources\/research\/email-authentication-requirements\/  \\n\\nWant to implement stronger DMARC policies? Get started here: \\nhttps:\/\/www.mailgun.com\/blog\/deliverability\/implement-dmarc\/\",\n    \"uploadDate\": \"2024-11-20T16:56:39+00:00\",\n    \"duration\": \"PT2M8S\"\n}        <\/script>\r\n        \t\t\r\n\t\t\t<\/div>\r\n\r\n\t\r\n\n<h4 class=\"wp-block-heading\">None<\/h4>\n\n<p class=\"wp-block-paragraph\">Right now, p=none is the minimum specification required. The <b>p=none <\/b>tag makes no changes to your existing arrangement \u2013 the receiving mail servers will pass on the message as normal to the recipient. This is a good place to start, as it allows you to monitor the initial DMARC reports in safe mode.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\"><b>Remember \u2013\u00a0<\/b><a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/bimi-mas-que-un-nombre-divertido\/\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>BIMI doesn&#8217;t support DMARC policies<\/b><\/a><b>\u00a0with the\u00a0<\/b><code><b>p=none<\/b><\/code><b>\u00a0option set to none.<\/b><\/p>\n\n<h4 class=\"wp-block-heading\">Quarantine<\/h4>\n\n<p class=\"wp-block-paragraph\">We should all know what a quarantine policy is by this point. For DMARC, this means sending unqualified mail to the spam folder until you are 100% sure where these emails are originating.\u00a0<\/p>\n\n<h4 class=\"wp-block-heading\">Reject<\/h4>\n\n<p class=\"wp-block-paragraph\"><code><b>p=reject<\/b><\/code>\u00a0is the end goal of DMARC. While quarantining is a good start, you don\u2019t want spoofed emails in your customer\u2019s spam folder forever. With that said, choosing this policy too early may result in legitimate emails bouncing. So only activate the\u00a0<code><b>reject<\/b><\/code>\u00a0policy once you have gone through your reports (see step five) with a fine toothpick.<\/p>\n\n<h4 class=\"wp-block-heading\">Volume<\/h4>\n\n<p class=\"wp-block-paragraph\">To control the flow of your authentication rollout, consider applying your policy to just a small percentage of your messages to begin with using this tag:\u00a0<code><b>pct=5<\/b><\/code><\/p>\n\n<p class=\"wp-block-paragraph\">The number five represents 5% of the total number of messages sent from your domain. Consider your time, resources, and risk appetite to determine how you want to set this value.\u00a0<b>Starting small and slowly increasing this value on a sliding scale is the safest approach.<\/b>\u00a0The default authentication volume will be 100% if you do not add this tag.<\/p>\n\n<h3 class=\"wp-block-heading\">3. Publish your TXT record<\/h3>\n\n<p class=\"wp-block-paragraph\">Now you\u2019ve defined your DMARC policy, it\u2019s time to push the button.\u00a0<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Go to your domain host\u2019s DNS settings in the management console.\u00a0<\/li>\n\n\n\n<li>Under the DNS hostname, enter the record name:\u00a0<code><b>_dmarc.yourdomain.com<\/b><\/code><\/li>\n\n\n\n<li>Under the DNS record value, enter your DMARC record (see \u201cbreaking down the record\u201d above).<\/li>\n\n\n\n<li>Save the changes.\u00a0<\/li>\n<\/ol>\n\n<h3 class=\"wp-block-heading\">4. Analyze your reports<\/h3>\n\n<p class=\"wp-block-paragraph\">You now have a DMARC record in place and reports have started landing in your mailbox. This data tells you which messages are passing or failing SPF and DKIM authentication. A raw XML DMARC report looks like this:<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4393\" width=\"600\" height=\"900\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/New_Project.jpeg\" alt=\"Image of raw code of XML DMARC report\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/New_Project.jpeg 600w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/New_Project-200x300.jpeg 200w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">Note: this record is paraphrased.<\/p>\n\n<p class=\"wp-block-paragraph\">Extensible Markup Language (XML) files like this are really designed for machine-reading and can be difficult and time-consuming for humans to read. There are a few methods for adding clarity to these reports:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Convert the records to tabular format using a\u00a0<a href=\"https:\/\/www.oracle.com\/uk\/database\/what-is-a-relational-database\/\" target=\"_tabs\" rel=\"noopener noreferrer\">relational database.<\/a><\/li>\n\n\n\n<li>Convert XML to HTML by\u00a0<a href=\"https:\/\/www.w3schools.com\/xml\/xsl_transformation.asp\" target=\"_tabs\" rel=\"noopener noreferrer\">applying an XSL style sheet.<\/a><\/li>\n\n\n\n<li>Use a\u00a0<a href=\"https:\/\/dmarcian.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">third-party SaaS provider<\/a>\u00a0to receive, store, and analyze your reports.<\/li>\n<\/ul>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4394\" width=\"600\" height=\"64\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Example_DMARC_report_in_tabular_format.png\" alt=\"Example DMARC report in tabular format\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Example_DMARC_report_in_tabular_format.png 600w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Example_DMARC_report_in_tabular_format-300x32.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">We\u2019re not robots \u2013 we like our reports in tabular format.<\/p>\n\n<p class=\"wp-block-paragraph\">We were lost, but now we can see. Hopefully we recognize the IP addresses in the left column as our own. However, it\u2019s unlikely you will remember all the IPs from your third-party apps. There is a three-step process to dealing with these email streams:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Assess<\/b>: Audit your sender IPs and cross-match with the IPs on your reports.<\/li>\n\n\n\n<li><b>Remediate<\/b>: Add DMARC records to all verified sending sources.<\/li>\n\n\n\n<li><b>Maintain<\/b>: Ensure the rollout is successful \u2013 if it\u2019s not, then\u00a0<a href=\"https:\/\/support.google.com\/a\/answer\/10032578\" target=\"_tabs\" rel=\"noopener noreferrer\">begin troubleshooting<\/a>.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">5. Roll out your strategy slowly<\/h3>\n\n<p class=\"wp-block-paragraph\">The DMARC policy (<code><b>p=<\/b><\/code>) you have chosen should evolve gradually like a traffic light from\u00a0<code><b>p=none<\/b><\/code>\u00a0to\u00a0<code><b>p=quarantine<\/b><\/code>\u00a0to finally\u00a0<code><b>p=reject<\/b><\/code><b>.\u00a0<\/b>This gives you time to collect data and methodically analyze your daily reports. A safe rollout would look like this:<\/p>\n\n<p class=\"wp-block-paragraph\">v=DMARC1; p=none; pct=100; rua=mailto:postmaster@example.com;\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">Starting with this record, messages are delivered normally and reports are issued from the ISP, letting you identify safe senders on your domain. Six weeks should be enough time to collect data before moving on to the next stage:<\/p>\n\n<p class=\"wp-block-paragraph\">v=DMARC1; p=quarantine; pct=5; rua=mailto:postmaster@example.com;\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">Slide the\u00a0<b>pct=<\/b>\u00a0up slowly as you gather information until you reach 100%. When you are happy with the quarantining messages, move on to the next stage:<\/p>\n\n<p class=\"wp-block-paragraph\">v=DMARC1; p=reject; pct=5; rua=mailto:postmaster@example.com;\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">Slide the\u00a0<code><b>pct=<\/b><\/code>\u00a0up slowly and ensure all legitimate mail is making it to the inbox until you hit 100%. Congratulations, you have safely and successfully implemented DMARC!\u00a0<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Learn more about DMARC from experts Ash Morin from Dmarcian and Kate Nowrouzi, VP of Deliverability at Mailgun, on our podcast \u2013\u00a0<a href='https:\/\/www.mailgun.com\/es\/resources\/podcasts\/implementacion-de-dmarc\/'>Email\u2019s Not Dead.<\/a><\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">6. Monitor your authentication success rate<\/h3>\n\n<p class=\"wp-block-paragraph\">Particularly with the new standards from Gmail and Yahoo, monitoring your authentication success rate, the percentage of your emails that pass authentication against all received traffic, is critical. For Google we\u2019ve made this easy with our <a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/google-postmaster-tools-entender-reputacion-como-remitente\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Google Postmaster Tools integration<\/a> which supports convenient monitoring of your authentication status across domains over a selected period of time.<\/p>\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_e2e8ad6e7d75a646dd2bd169fedd6d9a\">\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_e2e8ad6e7d75a646dd2bd169fedd6d9a\">\r\n                Google Postmaster Tools is integrated with Mailgun Optimize            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">The Mailgun Optimize suite was built to help senders tackle the most common issues preventing them from landing in the inbox. Now we&#x27;re taking it one step further by providing visibility into your most essential email analytics with Google Postmaster Tools in Mailgun Optimize.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/help.mailgun.com\/hc\/en-us\/articles\/15307328150939\"  class=\"btn btn-secondary\" >Try now<\/a><\/div>\r\n    <\/aside>\r\n\r\n\n<h2 class=\"wp-block-heading\">Use DMARC with Mailgun\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">Mailgun leads the charge in email authentication by\u00a0<a href=\"https:\/\/help.mailgun.com\/hc\/en-us\/articles\/360026833053-Domain-Verification-Walkthrough\" target=\"_tabs\" rel=\"noopener noreferrer\">requiring DKIM and SPF records by default<\/a>\u00a0before you can begin sending. Therefore, if you are already using Mailgun, you are just one step away from completing the authentication puzzle with DMARC. This process can also improve other aspects of your email program, like identifying safe IPs with the domain management function.<\/p>\n\n<p class=\"wp-block-paragraph\">But the story doesn\u2019t end here \u2013 an ISP is still entitled to send your messages to spam if you fail to follow email sending best practices. So why stop there when you\u2019re on a roll? Take a look through\u00a0<a href=\"https:\/\/www.mailgun.com\/es\/blog\/email-security-best-practices\/\" target=\"_tabs\" rel=\"noopener noreferrer\">these email deliverability best practices<\/a>\u00a0to keep your emails away from the spam folder and\u00a0<a href=\"https:\/\/www.mailgun.com\/es\/blog\/\" target=\"_tabs\" rel=\"noopener noreferrer\">join our newsletter<\/a><u>\u00a0to get these tips in your inbox every week!<\/u><\/p>\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_e3817c30b35c26dd5aa1cea32ce55b9a\">\r\n                    <p class=\"text-uppercase section-caption text-body-color\">\r\n                Protect your company against email fraud            <\/p>\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_e3817c30b35c26dd5aa1cea32ce55b9a\">\r\n                DMARC email authentication            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">Get DMARC advice so you don\u2019t have to worry about phishing attempts ever again.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/www.mailgun.com\/es\/soluciones\/servicios-entregabilidad-lp\/\"  class=\"btn btn-secondary\" >Learn more<\/a><\/div>\r\n    <\/aside>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>DMARC no es solo un registro, es el proceso de organizar tu programa de email para evitar que los suplantadores de identidad se hagan pasar por ti. Sigue estos pasos para configurarlo:<\/p>\n","protected":false},"author":41,"featured_media":4376,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-21680","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>Explicaci\u00f3n de DMARC: cinco pasos para la autenticaci\u00f3n de emails - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"DMARC no es solo un registro, es el proceso de organizar tu programa de email para evitar que los suplantadores de identidad se hagan pasar por ti. 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