{"id":14756,"date":"2026-05-27T19:03:32","date_gmt":"2026-05-27T19:03:32","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/mailgun-dmarcbis-est-mort\/"},"modified":"2026-09-15T16:27:55","modified_gmt":"2026-09-15T16:27:55","slug":"mailgun-dmarcbis-est-mort","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/fr\/blog\/deliverability\/mailgun-dmarcbis-est-mort\/","title":{"rendered":"Mailgun : DMARCbis est mort"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Mailgun:\u00a0DMARCbis\u00a0is\u00a0dead. Long\u00a0live DMARC<strong>.<\/strong>\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">The updated DMARC standard is here.\u00a0Here\u2019s\u00a0what changed, what\u00a0didn\u2019t, and what it means when you send through\u00a0Mailgun.\u00a0<\/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-4882\"><p class=\"h5 m-0\" id=\"toc-title-4882\">Table des mati\u00e8res<\/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=\"#dmarcbis-is-now-justdmarc\">DMARCbis\u00a0is now just\u2026DMARC\u00a0<\/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=\"#what-changed-in-the-spec-short-version\">What changed in the spec (short version)\u00a0<\/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-did-not-change\">What did not change\u00a0<\/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=\"#mailguns-authenticated-domain-model\">Mailgun\u2019s\u00a0authenticated\u2011domain\u00a0model\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=\"#practical-dmarc-maintenance-what-mailgun-senders-should-review\">Practical DMARC maintenance: What Mailgun senders should review<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">DMARCbis\u00a0is now just\u2026DMARC\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">Just when you were getting comfortable with new DMARC policies&#8230;<br \/>In May 2026, the IETF published a new DMARC RFC set that replaces RFC 7489: RFC 9989 (core DMARC), RFC 9990 (aggregate reporting), and RFC 9991 (failure reporting).\u00a0DMARCbis, previously known as\u00a0the draft \u201cnext version of DMARC\u201d,\u00a0is now the published DMARC standard.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Why does this matter?<\/strong><br \/>This change matters because mailbox providers increasingly expect authenticated, aligned mail as baseline sender behavior. The updated DMARC RFCs do not radically change those expectations, but they clarify and formalize practices that many senders and ESPs are already\u00a0operating\u00a0under today.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">For\u00a0Mailgun\u00a0senders, this is worth understanding, but\u00a0it\u2019s\u00a0not a \u201ctear out your DNS by Friday\u201d moment. The fundamentals are the same: authenticate your mail, keep identifiers aligned,\u00a0monitor\u00a0your reports, and fix streams that\u00a0don\u2019t\u00a0line up.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">The updated standard is cleaner, more explicit, and better aligned with how large-scale email authentication is\u00a0operated\u00a0in production.\u00a0<strong>For most senders<\/strong> already using authenticated domains and aligned identifiers correctly, this RFC refresh is more evolutionary than disruptive.<\/p>\n\n<h2 class=\"wp-block-heading\">What changed in the spec (short version)\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">The updated RFCs mostly refactor, clarify, and modernize DMARC documentation; they do not fundamentally change DMARC\u2019s core \u201caligned SPF or aligned DKIM\u201d evaluation model.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Three RFCs instead of one<\/strong>:\u00a0RFC 9989 covers policy and alignment, RFC 9990 covers aggregate reports, and RFC 9991 covers failure reports.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li><strong>DNS Tree Walk for policy discovery<\/strong>:\u00a0Receivers can walk up the DNS hierarchy instead of relying on a static public-suffix list. In practice, this mostly affects very large or complex domain structures (such as some .edu, .gov, or public suffix environments) and requires implementation changes on the receiver side. Most senders should still publish explicit DMARC records on the domains they actively use for mail, rather than relying on organizational-domain fallback behavior.<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li><strong>Tag changes<\/strong>:\u00a0New tags like\u00a0<em>np\u00a0<\/em>(non\u2011existent\u00a0subdomain policy) and\u00a0<em>psd\u00a0<\/em>(public suffix domain) are added; obsolete tags like\u00a0<em>pct<\/em>,\u00a0<em>rf<\/em>, and\u00a0<em>ri\u00a0<\/em>are removed; a new\u00a0<em>t\u00a0<\/em>tag better describes testing behavior.\u00a0<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">If you maintain DMARC records, you may eventually choose to remove retired tags like <em>pct, rf, <\/em>and<em> ri<\/em> for cleanliness and readability, though receivers are expected to ignore unknown or obsolete tags. Most senders are unlikely to need the new <em>psd<\/em> tag, while <em>np<\/em> may be relevant for organizations managing large or complex subdomain structures.<\/p>\n\n<h2 class=\"wp-block-heading\">What did not change\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">The part\u00a0Mailgun\u00a0customers should keep\u00a0top\u2011of\u2011mind:\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">DMARC still passes when the visible\u00a0<em>From\u00a0<\/em>domain aligns with\u00a0either\u00a0SPF or DKIM, not only when both align.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">DMARC still evaluates whether the Author Domain (visible\u00a0<em>From<\/em>) aligns with an authenticated identifier from:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>SPF (MAIL FROM \/\u00a0Return\u2011Path\u00a0domain)\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>DKIM (d=\u00a0signing domain)\u00a0<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Alignment\u00a0remains\u00a0strict (exact match) or relaxed (same organizational domain, such as\u00a0mg.example.com\u00a0and\u00a0example.com).\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">It\u2019s\u00a0also worth separating domain alignment from IP reputation. Shared versus dedicated IPs affect reputation management, warmup, and troubleshooting visibility, but they do not fundamentally change how DMARC alignment works. Whether you send on shared or dedicated infrastructure, DMARC still evaluates whether your visible\u00a0<em>From\u00a0<\/em>domain aligns with<a href=\"https:\/\/www.mailgun.com\/fr\/blog\/deliverability\/authentification-des-emails-votre-carte-identite-pour-envoi\/\"> authenticated SPF or DKIM identifiers.\u00a0<\/a><\/p>\n\n<p class=\"wp-block-paragraph\">DMARC\u00a0continues to rely on\u00a0<a href=\"https:\/\/www.mailgun.com\/fr\/blog\/dev-life\/comment-configurer-authentification-emails\/\">\u201cSPF or DKIM<\/a> with alignment,\u201d not \u201cSPF and DKIM and DMARC all passing independently.\u201d Passing DMARC still\u00a0doesn\u2019t\u00a0guarantee inbox placement; it proves authorized use of the domain, while reputation, engagement, and content still decide where the message lands.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">Mailgun\u2019s\u00a0authenticated\u2011domain\u00a0model\u00a0<\/h2>\n\n<p class=\"wp-block-paragraph\">This is where the spec meets what you do in the\u00a0Mailgun\u00a0control panel.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">How\u00a0Mailgun\u00a0uses your\u00a0authenticated\u00a0domains\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">When you add a sending domain (often a subdomain like\u00a0mg.example.com) in\u00a0Mailgun:\u00a0<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Mailgun gives you SPF and DKIM TXT records to publish on\u00a0that domain, along with MX and optional tracking CNAME records.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The domain must verify before you can send;\u00a0Mailgun\u2019s\u00a0standard authenticated-domain flow expects <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/email\/rotation-cles-dkim\/\">a valid DKIM key<\/a> in DNS before the domain is treated as fully authenticated.\u00a0<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><strong>Once\u00a0that\u2019s\u00a0done:\u00a0<\/strong><\/p>\n\n<ul class=\"wp-block-list\">\n<li>Mailgun\u00a0signs outgoing mail with DKIM using\u00a0your sending domain\u00a0in the\u00a0d=\u00a0value, for example\u00a0d=mg.example.com.\u00a0<\/li>\n<\/ul>\n\n<ul class=\"wp-block-list\">\n<li>The MAIL FROM \/ Return-Path is typically based on your\u00a0Mailgun\u00a0sending domain\u00a0<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Mailgun\u00a0is capable of sending\u00a0fully\u00a0SPF\u2011aligned\u00a0mail using\u00a0your authenticated\u00a0subdomains, and not\u00a0just\u00a0MAIL\u2011FROMs on a\u00a0provider\u2011owned\u00a0domain by default.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">In other words, in the standard\u00a0authenticated\u2011domain\u00a0flow,\u00a0Mailgun\u00a0authenticates mail\u00a0on your domains, so alignment lives on your side of the house.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">If\u00a0you\u2019re\u00a0using the conventional\u00a0Mailgun\u00a0pattern\u00a0of\u00a0dedicated sending subdomains,\u00a0Mailgun\u2011provided\u00a0SPF and DKIM on those domains, and a matching\u00a0<em>From\u00a0<\/em>domain, then\u00a0both SPF alignment and DKIM alignment are achievable without special workarounds.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">Automatic Sender Security (ASS)\u00a0doesn\u2019t\u00a0change that story: it automates key generation and rotation for your domain\u2019s selectors, but the signing still uses your domain in\u00a0<em>d=<\/em>.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">Practical DMARC maintenance: What Mailgun senders should review<\/h2>\n\n<p class=\"wp-block-paragraph\">You\u00a0can keep your current\u00a0architecture.\u00a0But,\u00a0you\u00a0need to make sure\u00a0it\u00a0matches what DMARC now describes more clearly.\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\"> <p class=\"mb-0\"><b>Pro tip:<\/b>&nbsp;Not sure where to start? Check out our post on <a href=\"https:\/\/www.mailgun.com\/fr\/blog\/deliverability\/implementer-dmarc\/\">DMARC explained: A step by step guide to authentication.<\/a><\/p><\/div>\r\n    <\/div>\r\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Inventory&nbsp;Mailgun&nbsp;domains and usage&nbsp;\n<ul class=\"wp-block-list\">\n<li>List all\u00a0Mailgun\u2011verified\u00a0domains and which streams (transactional, marketing, app notifications) use each.\u00a0<\/li>\n\n\n\n<li>Retire or tighten DMARC on domains that are no longer actively used, especially if they still have permissive records.\u00a0<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Verify aligned SPF and DKIM, not just \u201cpass\u201d&nbsp;\n<ul class=\"wp-block-list\">\n<li>Confirm\u00a0SPF is correctly published on each\u00a0Mailgun\u00a0sending domain and that those domains share an organizational domain with the visible\u00a0<em>From<\/em>.\u00a0<\/li>\n\n\n\n<li>Use a header analyzer to confirm that\u00a0<em>d=<\/em>\u00a0in the DKIM signature matches your\u00a0Mailgun\u00a0sending domain (or a subdomain under your org), not some unrelated hostname.\u00a0<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Clean up your DMARC records&nbsp;\n<ul class=\"wp-block-list\">\n<li>Remove\u00a0<em>pct<\/em>,\u00a0<em>rf<\/em>, and\u00a0<em>ri\u00a0<\/em>tags, which the new spec drops.\u00a0<\/li>\n\n\n\n<li>Consider whether\u00a0<em>np\u00a0<\/em>and\u00a0<em>psd\u00a0<\/em>are relevant for your domain structure.\u00a0<\/li>\n\n\n\n<li>Confirm your\u00a0<em>sp=<\/em>\u00a0behavior for subdomains is intentional.\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>Treat aggregate reports as an&nbsp;early\u2011warning&nbsp;system&nbsp;\n<ul class=\"wp-block-list\">\n<li>Use DMARC aggregate reports to spot new\u00a0Mailgun\u00a0domains, forgotten legacy streams, or misaligned\u00a0third\u2011party\u00a0senders using your domain.\u00a0<\/li>\n\n\n\n<li>If\u00a0you\u2019re\u00a0at\u00a0<em>p=none<\/em>, treat that as active monitoring, not \u201cwe\u2019ll look someday.\u201d\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li>Keep DMARC and DKIM2 mentally separate&nbsp;\n<ul class=\"wp-block-list\">\n<li>You\u2019ll\u00a0hear more about DKIM2, but\u00a0that\u2019s\u00a0a separate protocol effort focused on signing models and replay protections.\u00a0<\/li>\n\n\n\n<li>The DMARC RFC refresh does not make DKIM2 a requirement, and today\u2019s DMARC evaluations still rely on SPF and DKIM exactly as before. There is ongoing discussion in the IETF about whether DKIM2 could eventually play a role in future DMARC-style evaluations, but that work remains separate and unsettled for now.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\"><strong>DMARCbis\u00a0is dead.<\/strong> Long live DMARC. For most Mailgun customers already using authenticated domains and aligned identifiers correctly, the new RFCs should feel more like a clarification of existing best practices than a major operational shift.\u00a0<\/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! 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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 Mailgun Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Mailgun:\u00a0DMARCbis\u00a0is\u00a0dead. Long\u00a0live DMARC.\u00a0 The updated DMARC standard is here.\u00a0Here\u2019s\u00a0what changed, what\u00a0didn\u2019t, and what it means when you send through\u00a0Mailgun.\u00a0 DMARCbis\u00a0is now just\u2026DMARC\u00a0 Just when you were getting comfortable with new DMARC policies&#8230;In May 2026, the IETF published a new DMARC RFC set that replaces RFC 7489: RFC 9989 (core DMARC), RFC 9990 (aggregate reporting), and [&hellip;]<\/p>\n","protected":false},"author":89,"featured_media":4376,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-14756","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>Mailgun : DMARCbis est mort<\/title>\n<meta name=\"description\" content=\"DMARCbis est officiellement mort. 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