{"id":1896,"date":"2026-01-23T12:29:03","date_gmt":"2026-01-23T12:29:03","guid":{"rendered":"https:\/\/www.emailverify.io\/blog\/?p=1896"},"modified":"2026-01-23T12:29:03","modified_gmt":"2026-01-23T12:29:03","slug":"why-dmarc-failures-happen","status":"publish","type":"post","link":"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/","title":{"rendered":"Why DMARC Failures Happen And What You Can Do to Fix Them"},"content":{"rendered":"<p><a href=\"https:\/\/www.validity.com\/blog\/dmarc-adoption-a-deep-dive-into-the-current-state-of-email-authentication\/\" rel=\"nofollow\" target=\"_blank\">Validity\u2019s latest research on DMARC adoption<\/a> says 84% of domains that appear as senders in people\u2019s inboxes don\u2019t even have a DMARC record.<\/p>\n<p>In plain terms, this leads to:<\/p>\n<ul>\n<li>Email spoofing<\/li>\n<li>Phishing attacks<\/li>\n<li>Unauthorized use of your domain<\/li>\n<li>Emails landing in spam or being rejected<\/li>\n<li>High bounce rates from <a href=\"https:\/\/www.emailverify.io\/blog\/invalid-emails\/\" target=\"_blank\" rel=\"noopener\">invalid emails<\/a><\/li>\n<li>Brand reputation damage<\/li>\n<li>Lost customer trust<\/li>\n<\/ul>\n<p>You might not have set up DMARC. But even when you have it, it can be misconfigured.<\/p>\n<p>SPF and DKIM might be in place, but not aligned. Third-party tools could be sending emails without proper authorization. Forwarding and subdomains can make things even more complicated.<\/p>\n<p>What happens as a result?<\/p>\n<p>Failure\u2026 Legitimate emails are treated as suspicious, sent to spam, or rejected outright.<\/p>\n<p>In this guide, we\u2019ll cover what a DMARC failure means, what causes it, ways to detect it, and lastly, how to fix it without breaking legitimate email flows.<\/p>\n<p>If email is a critical channel for your business, these are the details that determine if your messages get delivered or silently disappear.<\/p>\n<p>First, let\u2019s start with the basics of DMARC, so you have a clear foundation before we dig into failures and fixes.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#what-is-dmarc\" >What Is DMARC?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#what-is-a-dmarc-failure\" >What Is a DMARC Failure?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#what-are-the-common-causes-of-dmarc-failure\" >What Are The Common Causes Of DMARC Failure?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#how-to-detect-dmarc-failures\" >How To Detect DMARC Failures?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#a-step-by-step-guide-to-fixing-dmarc-failures\" >A Step-by-Step Guide To Fixing DMARC Failures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#the-bottom-line\" >The Bottom Line<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/#frequently-asked-questions-faqs\" >Frequently Asked Questions (FAQs)<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-is-dmarc\"><\/span>What Is DMARC?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>DMARC (Domain-based Message Authentication, Reporting &amp; Conformance) is a protocol that helps protect your domain from spoofing. It works with SPF and DKIM to make sure only authorized senders can use your email address.<\/p>\n<p>It\u2019s like a gatekeeper for your inbox. It checks that emails claiming to be from your domain are really from you. It helps keep phishing and unauthorized messages out.<\/p>\n<p>Without DMARC, your legitimate <a href=\"https:\/\/www.emailverify.io\/blog\/why-emails-land-in-spam\/\" target=\"_blank\" rel=\"noopener\">emails might be flagged as spam<\/a>, which can hurt inbox placement, reduce campaign effectiveness, and even impact revenue.<\/p>\n<h3>How Does DMARC Work?<\/h3>\n<p>DMARC works in three layers, each building on SPF and DKIM to ensure emails claiming to come from your domain are legitimate.<br \/>\nAuthentication problems arise when you\u2019re missing or using incorrect records, which is <a href=\"https:\/\/www.emailverify.io\/blog\/why-emails-fail-to-send\/\" target=\"_blank\" rel=\"noopener\">why your emails fail to send<\/a>.<\/p>\n<ul>\n<li><strong>SPF (Sender Policy Framework):<\/strong> Checks if the server sending the email is allowed to send on behalf of your domain.<\/li>\n<li><strong>DKIM (DomainKeys Identified Mail):<\/strong> Attaches a digital signature to your email so receivers can verify it hasn\u2019t been altered and is from your domain.<\/li>\n<li><strong>DMARC Alignment:<\/strong> Confirms the From address matches the domains validated by SPF or DKIM. This can be a relaxed alignment (subdomains accepted) or a strict alignment (exact match only).<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-1906\" src=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/How-Does-DMARC-Work.webp\" alt=\"How Does DMARC Work\" width=\"720\" height=\"256\" srcset=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/How-Does-DMARC-Work.webp 720w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/How-Does-DMARC-Work-300x107.webp 300w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/How-Does-DMARC-Work-450x160.webp 450w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/p>\n<h3>Step-by-Step Flow Of DMARC Processing<\/h3>\n<p>When an email arrives at a recipient\u2019s server, here\u2019s what happens:<\/p>\n<ol>\n<li>The server looks up your DMARC record in DNS.<\/li>\n<li>It checks the sending IP against your SPF list.<\/li>\n<li>It verifies the DKIM signature, if present, to ensure the message hasn\u2019t been tampered with.<\/li>\n<li>It checks if SPF or DKIM aligns with the From address.<\/li>\n<li>The server applies your DMARC policy to determine how to handle the email.<\/li>\n<\/ol>\n<h3>What Is a DMARC Policy?<\/h3>\n<p>A DMARC policy specifies how receiving servers should handle emails that fail DMARC authentication. It protects your domain from email spoofing and unauthorized emails while helping legitimate messages reach the inbox.<\/p>\n<p>The following are the DMARC policies you should know about:<\/p>\n<p><strong>p=none<\/strong><br \/>\nThis is the monitoring mode. Emails that fail DMARC checks are still delivered, but you receive DMARC aggregate reports showing which messages passed or failed.<\/p>\n<p>It is ideal when you\u2019re starting email authentication or testing new email sending platforms.<\/p>\n<p><strong>p=quarantine<\/strong><\/p>\n<p>Emails that fail DMARC authentication are sent to the spam folder or quarantined. It protects against phishing and domain spoofing without immediately rejecting messages.<\/p>\n<p>It\u2019s useful when using third-party email senders or transactional email services.<\/p>\n<p><strong>p=reject<\/strong><\/p>\n<p>This is the strictest mode. Emails failing DMARC authentication are blocked or bounced. It\u2019s highly effective at stopping spoofing and protecting email deliverability. But it&#8217;s only recommended once SPF, DKIM, and subdomain policies are correctly configured.<\/p>\n<p><strong>Subdomain Policies<\/strong><\/p>\n<p>Subdomain policies let you assign different DMARC policies to each subdomain. This helps prevent legitimate messages sent from secondary domains, such as newsletters, order confirmations, or tools used by external vendors, from causing DMARC failures on your primary domain.<\/p>\n<p><strong>Example<\/strong><\/p>\n<p>newsletter.yourcompany.com for campaigns and shop.yourcompany.com for purchase notifications. Each subdomain can have its own rules, so issues there do not impact your primary domain\u2019s email authentication or inbox placement.<\/p>\n<h3>DMARC Policy: Risk vs Readiness<\/h3>\n\n<table id=\"tablepress-50\" class=\"tablepress tablepress-id-50\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><strong>Policy<\/strong><\/th><th class=\"column-2\"><strong>Risk<\/strong><\/th><th class=\"column-3\"><strong>Readiness \/ When to Use<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><strong>p=none<\/strong><\/td><td class=\"column-2\">No blocking; spoofing is not prevented.<\/td><td class=\"column-3\">Good for testing SPF\/DKIM and identifying all senders. Safe for new domains.<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\"><strong>p=quarantine<\/strong><\/td><td class=\"column-2\">Legitimate emails may go to spam if SPF\/DKIM is misconfigured.<\/td><td class=\"column-3\">Use when most senders are authenticated. Provides partial protection.<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\"><strong>p=reject<\/strong><\/td><td class=\"column-2\">High risk of blocking legitimate emails if SPF\/DKIM or alignment is wrong.<\/td><td class=\"column-3\">Use only when all senders are fully configured and passing DMARC. Stops spoofing and protects brand trust.<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\"><strong>Subdomain policies (sp=, asp=)<\/strong><\/td><td class=\"column-2\">Misconfigured subdomains can break their own email delivery.<\/td><td class=\"column-3\">Use for newsletters, transactional emails, or vendor tools while keeping the main domain policy strict.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-50 from cache -->\n<h3>DMARC Result And Policy Actions<\/h3>\n<p>The following table shows what happens when an email passes or fails DMARC authentication based on your DMARC policy:<\/p>\n\n<table id=\"tablepress-51\" class=\"tablepress tablepress-id-51\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><strong>DMARC Result<\/strong><\/th><th class=\"column-2\"><strong>Policy Action<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><strong>Pass<\/strong><\/td><td class=\"column-2\">Email delivered normally<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\"><strong>Fail + p = none<\/strong><\/td><td class=\"column-2\">Email delivered, DMARC aggregate reports sent<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\"><strong>Fail + p = quarantine<\/strong><\/td><td class=\"column-2\">Email sent to spam folder<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\"><strong>Fail + p = reject<\/strong><\/td><td class=\"column-2\"><a href=\"https:\/\/www.emailverify.io\/blog\/bounced-emails\/\" target=\"_blank\"><u>Email bounced<\/u><\/a> or rejected<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-51 from cache -->\n<h2><span class=\"ez-toc-section\" id=\"what-is-a-dmarc-failure\"><\/span>What Is a DMARC Failure?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A DMARC failure occurs when an email from your domain cannot be verified as legitimate. This can happen if authentication is incomplete, a third-party service is sending emails without proper authorization, or forwarding and subdomains interfere with validation.<\/p>\n<p>When an email fails DMARC, it may be flagged as suspicious, sent to the spam folder, or rejected entirely. These failures can affect inbox placement, campaign performance, and overall brand reputation.<\/p>\n<p>Valimail reviewed the top 10 million domains and found that, in February 2024, after <a href=\"https:\/\/support.google.com\/a\/answer\/81126\" rel=\"nofollow\" target=\"_blank\">Google\u2019s Sender Guidelines<\/a> and <a href=\"https:\/\/senders.yahooinc.com\/best-practices\/\" rel=\"nofollow\" target=\"_blank\">Yahoo\u2019s Sender Best Practices<\/a> began requiring valid DMARC records, over half a million domains finally published one. Clearly, getting DMARC authentication right is no longer optional.<\/p>\n<p>Knowing where failures occur helps you pinpoint issues and take action. The following sections will explain the common causes of DMARC failures, how to detect them, and practical ways to fix them without disrupting legitimate emails.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-are-the-common-causes-of-dmarc-failure\"><\/span>What Are The Common Causes Of DMARC Failure?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>DMARC failures can happen for a variety of reasons, and understanding them is the first step to protecting your email security and ensuring smooth email deliverability.<\/p>\n<p>Let\u2019s break down the most frequent causes of DMARC failure:<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-1907\" src=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/What-Are-The-Common-Causes-Of-DMARC-Failure.webp\" alt=\"What Are The Common Causes Of DMARC Failure\" width=\"719\" height=\"328\" srcset=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/What-Are-The-Common-Causes-Of-DMARC-Failure.webp 719w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/What-Are-The-Common-Causes-Of-DMARC-Failure-300x137.webp 300w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/What-Are-The-Common-Causes-Of-DMARC-Failure-450x205.webp 450w\" sizes=\"(max-width: 719px) 100vw, 719px\" \/><\/p>\n<h3>Cause #1: Misconfigured SPF Records<\/h3>\n<p>SPF is your first line of defense. Failures happen when:<\/p>\n<ul>\n<li>There\u2019s no SPF record or syntax errors in your DNS TXT records.<\/li>\n<li>You exceed the 10 DNS lookup limit.<\/li>\n<li>Third-party platforms, such as CRMs or marketing tools, aren\u2019t included.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Emails may fail DMARC and land in spam or be rejected, reducing deliverability and affecting campaign performance.<\/p>\n<p>When this is combined with frequent bounces from unverified recipients, mailbox providers see even stronger negative signals. Running <a href=\"https:\/\/www.emailverify.io\/services\/email-verify\/\" target=\"_blank\" rel=\"noopener\">bulk email verification<\/a> before large sends helps reduce these risks and keeps authentication signals clean.<\/p>\n<h3>Cause #2: DKIM Not Set Up or Misaligned<\/h3>\n<p>A missing or misaligned DKIM signature can cause a DMARC fail.<\/p>\n<p>Common issues include:<\/p>\n<ul>\n<li>Using the provider\u2019s domain instead of your own.<\/li>\n<li>Expired or rotated DKIM keys.<\/li>\n<li>Alignment issues where the DKIM domain doesn\u2019t match the From address.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Emails appear suspicious to recipients, lowering trust, engagement, and brand credibility.<\/p>\n<h3>Cause #3: Domain Alignment Problems<\/h3>\n<p>DMARC alignment is critical. Problems occur when:<\/p>\n<ul>\n<li>SPF and DKIM alignment don\u2019t match the visible sender domain.<\/li>\n<li>Subdomains send emails without proper configuration.<\/li>\n<li>Relaxed and strict mode settings cause unexpected failures.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Legitimate emails may fail authentication, affecting transactional emails, marketing campaigns, and customer trust.<\/p>\n<h3>Cause #4: Third-Party Services Not Authorized<\/h3>\n<p>Emails sent from email service providers, transactional platforms, or third-party senders can fail if not properly configured. Examples include:<\/p>\n<ul>\n<li>Marketing platforms like <a href=\"https:\/\/mailchimp.com\/\" rel=\"nofollow\" target=\"_blank\">Mailchimp<\/a> or <a href=\"https:\/\/sendgrid.com\/en-us\" rel=\"nofollow\" target=\"_blank\">SendGrid<\/a>.<\/li>\n<li>CRM platforms are sending emails without correct DKIM keys or SPF entries.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Messages from these services may be blocked or marked as spam. It hurts campaign ROI and user experience.<\/p>\n<h3>Cause #5: Forwarding and Mailing Lists<\/h3>\n<p>Email forwarding can break authentication:<\/p>\n<ul>\n<li>Auto-forwarding can cause SPF failures.<\/li>\n<li>Mailing lists often rewrite headers, breaking alignment.<\/li>\n<li>Implementing ARC (Authenticated Received Chain) can help preserve DMARC authentication.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Forwarded or group emails may fail DMARC, leading to reduced email deliverability and missed communications.<\/p>\n<h3>Cause #6: Subdomain-Specific Issues<\/h3>\n<p>Subdomains need their own records. Problems arise when:<\/p>\n<ul>\n<li>SPF, DKIM, or DMARC policy isn\u2019t set for subdomains.<\/li>\n<li>Strict policies on unprepared subdomains trigger DMARC fail.<\/li>\n<\/ul>\n<p><strong>Impact:<\/strong> Emails from subdomains like newsletters or order notifications, may fail, causing delivery issues without affecting the main domain.<\/p>\n<h3>Cause #7: Dynamic or Shared IP Addresses<\/h3>\n<p>Shared IPs often carry poor reputations and missing reverse <a href=\"https:\/\/www.emailverify.io\/blog\/dns-records-for-email\/\" target=\"_blank\" rel=\"noopener\">DNS records<\/a>, which can cause SPF alignment and DMARC failures.<\/p>\n<p><strong>Impact:<\/strong> Emails may fail DMARC checks, be filtered as spam, and reduce overall email deliverability.<\/p>\n<div class=\"blogDetailCtaWrapper\">\n<div class=\"blogDetailCtaContainer\">\n<p class=\"ctaMainHeading\">Are Invalid Emails Sabotaging Your DMARC Setup? EmailVerify.io helps you clean and verify your sending lists to keep your authentication intact.<\/p>\n<p><a class=\"ctaButton\" href=\"https:\/\/www.emailverify.io\/services\/email-verify\/\" target=\"_blank\" rel=\"noopener\">Clean Your Email Lists Today<\/a><\/p>\n<\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"how-to-detect-dmarc-failures\"><\/span>How To Detect DMARC Failures?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>You can\u2019t fix a DMARC fail if you don\u2019t know it\u2019s happening. Detecting issues early keeps messages out of spam folders and ensures your emails reach the right inboxes.<\/p>\n<p>In this section, we\u2019ll cover the main ways to identify DMARC issues so you can take action quickly.<\/p>\n<h3>1. Check Email Headers<\/h3>\n<p>Email headers hold clues about why a message might fail DMARC. They show results for SPF, DKIM, and domain alignment.<\/p>\n<p><strong>How to check headers<\/strong><\/p>\n<ul>\n<li><strong>Gmail:<\/strong> Open the email \u2192 click the three dots \u2192 Show original \u2192 find Authentication-Results<\/li>\n<li><strong>Outlook:<\/strong> Open the email \u2192 click the three dots \u2192 View message details \u2192 look for SPF lines<\/li>\n<li><strong>Yahoo:<\/strong> Open the email \u2192 Click More \u2192 View raw message<\/li>\n<li><strong>Apple Mail:<\/strong> Open the email \u2192 View Source<\/li>\n<\/ul>\n<p>These headers reveal failing IPs, misaligned domains, and broken DKIM keys.<\/p>\n<p><strong>Authentication-Results Headers Reference Table<\/strong><\/p>\n\n<table id=\"tablepress-52\" class=\"tablepress tablepress-id-52\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><strong>Provider<\/strong><\/th><th class=\"column-2\"><strong>Pass Example<\/strong><\/th><th class=\"column-3\"><strong>Fail Example<\/strong><\/th><th class=\"column-4\"><strong>What Failed<\/strong><\/th><th class=\"column-5\"><strong>Quick Fix<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><a href=\"https:\/\/mail.google.com\/mail\/u\/0\/\" target=\"_blank\"><u>Gmail<\/u><\/a><\/td><td class=\"column-2\">spf=pass; dkim=pass; dmarc=pass (p=QUARANTINE)<\/td><td class=\"column-3\">spf=fail; dkim=none; dmarc=fail<\/td><td class=\"column-4\">SPF + no DKIM<\/td><td class=\"column-5\">Add sender to SPF, enable DKIM<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\"><a href=\"https:\/\/login.yahoo.com\/?.src=ym&#038;pspid=159600001&#038;activity=mail-direct&#038;.lang=en-GB&#038;.intl=gb&#038;.done=https%3A%2F%2Fmail.yahoo.com%2Fd\" target=\"_blank\"><u>Yahoo<\/u><\/a><\/td><td class=\"column-2\">spf=pass; dkim=pass; dmarc=pass(p=REJECT)<\/td><td class=\"column-3\">dmarc=fail(p=QUARANTINE)<\/td><td class=\"column-4\">Alignment fail<\/td><td class=\"column-5\">Match From domain in SPF\/DKIM<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\"><a href=\"https:\/\/outlook.live.com\/mail\/0\/\" target=\"_blank\"><u>Outlook<\/u><\/a><\/td><td class=\"column-2\">spf=pass; dkim=pass; dmarc=pass action=none<\/td><td class=\"column-3\">dmarc=fail action=quarantine<\/td><td class=\"column-4\">Third-party sender<\/td><td class=\"column-5\">Add ESP to SPF include<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\"><a href=\"https:\/\/www.icloud.com\/mail\" target=\"_blank\"><u>iCloud Mail<\/u><\/a><\/td><td class=\"column-2\">spf=pass; dkim=pass (1024-bit); dmarc=pass<\/td><td class=\"column-3\">dkim=fail; dmarc=fail<\/td><td class=\"column-4\">DKIM signature broken<\/td><td class=\"column-5\">Fix the DKIM key or forwarding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-52 from cache -->\n<h3>2. DMARC Aggregate and Forensic Reports<\/h3>\n<p>RUA (aggregate) reports show overall trends of DMARC failures across all emails. At the same time, RUF (forensic) reports provide detailed information about individual failed messages.<\/p>\n<p>These reports help you identify:<\/p>\n<ul>\n<li>Which IP addresses or third-party senders are failing<\/li>\n<li>Misaligned internal email or mail forwarding issues<\/li>\n<li>Patterns that could impact email deliverability<\/li>\n<\/ul>\n<p>Reading these reports regularly gives a clear picture of authentication problems before they affect your inbox.<\/p>\n<p>At higher sending volumes, small pockets of invalid addresses can distort DMARC reports and make real alignment issues harder to spot. Therefore, many teams pair monitoring with <a href=\"https:\/\/www.emailverify.io\/solutions\/enterprise\/\" target=\"_blank\" rel=\"noopener\">large-scale email verification<\/a> to keep failure data clean and actionable.<\/p>\n<h3>3. Use DMARC Monitoring Tools<\/h3>\n<p>Monitoring tools make it easy to spot DMARC failures and provide visibility across all sending sources.<\/p>\n<p>We have mentioned some of the best ones below:<\/p>\n\n<table id=\"tablepress-53\" class=\"tablepress tablepress-id-53\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><strong>Tool<\/strong><\/th><th class=\"column-2\"><strong>Free Tier<\/strong><\/th><th class=\"column-3\"><strong>Paid Starts<\/strong><\/th><th class=\"column-4\"><strong>Best For<\/strong><\/th><th class=\"column-5\"><strong>Key Features<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\"><a href=\"https:\/\/dmarcian.com\/\" target=\"_blank\"><u>dmarcian<\/u><\/a><\/td><td class=\"column-2\">Basic parser<\/td><td class=\"column-3\">$199\/mo<\/td><td class=\"column-4\">Enterprises<\/td><td class=\"column-5\">Dashboards, alerts, API, up to 2 domains<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\"><a href=\"https:\/\/mxtoolbox.com\/\" target=\"_blank\"><u>MX Toolbox<\/u><\/a><\/td><td class=\"column-2\">1 monitor<\/td><td class=\"column-3\">$129\/mo<\/td><td class=\"column-4\">Quick checks<\/td><td class=\"column-5\">Header analysis, blocklist checks<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\"><a href=\"https:\/\/dmarc.postmarkapp.com\/\" target=\"_blank\"><u>Postmark DMARC<\/u><\/a><\/td><td class=\"column-2\">No<\/td><td class=\"column-3\">$14\/mo per domain<\/td><td class=\"column-4\">Developers<\/td><td class=\"column-5\">XML \u2192 charts, integrates with Postmark<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\"><a href=\"https:\/\/easydmarc.com\/\" target=\"_blank\"><u>EasyDMARC<\/u><\/a><\/td><td class=\"column-2\">1 domain, 14-day history<\/td><td class=\"column-3\">$36\/mo<\/td><td class=\"column-4\">SMBs<\/td><td class=\"column-5\">Auto-fixes, global monitoring<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\"><a href=\"https:\/\/www.valimail.com\/\" target=\"_blank\"><u>Valimail<\/u><\/a><\/td><td class=\"column-2\">Free monitor<\/td><td class=\"column-3\">Custom enterprise<\/td><td class=\"column-4\">Large orgs<\/td><td class=\"column-5\">Enterprise-grade, unlimited domains<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-53 from cache -->\n<p>We have mentioned some of the best ones below:<\/p>\n<p>These tools simplify ongoing monitoring of policy, alert you to failing DKIM keys, and track domain alignment, helping you maintain strong deliverability and authentication across all emails.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"a-step-by-step-guide-to-fixing-dmarc-failures\"><\/span>A Step-by-Step Guide To Fixing DMARC Failures<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Fixing a DMARC failure doesn\u2019t have to be complicated, but it does need a clear plan. <a href=\"https:\/\/www.verizon.com\/business\/resources\/reports\/dbir\/\" rel=\"nofollow\" target=\"_blank\">Verizon\u2019s 2025 Data Breach Investigations Report<\/a> shows email-based threats account for 44% of data breaches.<\/p>\n<p>You want to ensure legitimate emails continue to flow while you tighten authentication.<\/p>\n<p>The following DMARC troubleshooting steps will help you resolve failures and improve your email deliverability.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-1908\" src=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/A-Step-by-Step-Guide-To-Fixing-DMARC-Failures.webp\" alt=\"A Step-by-Step Guide To Fixing DMARC Failures\" width=\"626\" height=\"720\" srcset=\"https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/A-Step-by-Step-Guide-To-Fixing-DMARC-Failures.webp 626w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/A-Step-by-Step-Guide-To-Fixing-DMARC-Failures-261x300.webp 261w, https:\/\/www.emailverify.io\/blog\/wp-content\/uploads\/2026\/01\/A-Step-by-Step-Guide-To-Fixing-DMARC-Failures-450x518.webp 450w\" sizes=\"(max-width: 626px) 100vw, 626px\" \/><\/p>\n<h3>Step 1: Start with a Safe DMARC Policy<\/h3>\n<p>Begin with p=none so you can monitor without blocking emails. This helps you gather data without impacting legitimate messages.<\/p>\n<h3>Step 2: Audit All Sending Sources<\/h3>\n<p>Make a complete list of all senders: internal servers, email service providers (ESPs), CRMs, and transactional platforms. Knowing every source is key before you make changes. And don\u2019t forget to <a href=\"https:\/\/www.emailverify.io\/blog\/clean-email\/\" target=\"_blank\" rel=\"noopener\">clean your email lists<\/a>, as bounces hurt DMARC compliance.<\/p>\n<p>Before tightening DMARC policies, make sure every sender and address is accounted for. Even a few invalid emails can throw off alignment and reduce deliverability, so running email verification for small businesses keeps your sending list clean without adding extra complexity.<\/p>\n<h3>Step 3: Fix SPF<\/h3>\n<p>Include all sending services in a single, valid SPF record. Check syntax carefully. Decide between soft fail (~all) and hard fail (-all) depending on how strict you want to be.<\/p>\n<h3>Step 4: Set Up and Align DKIM<\/h3>\n<p>Enable DKIM for all sending sources. Ensure the signatures use your domain, not the provider\u2019s. Rotate DKIM keys regularly to maintain signature integrity.<\/p>\n<h3>Step 5: Correct Domain Alignment<\/h3>\n<p>Check that SPF and DKIM align with the visible From address. Handle subdomains and third-party senders carefully to avoid misalignment.<\/p>\n<h3>Step 6: Authorize Third-Party Senders<\/h3>\n<p>Add SPF include statements for all platforms. Set up DKIM for your domain where possible. Test with sample messages and confirm in DMARC aggregate reports.<\/p>\n<h3>Step 7: Handle Forwarding and Mailing Lists<\/h3>\n<p>Enable ARC or relaxed alignment if auto-forwarding is needed. Separate subdomains can help prevent failures from mailing list complications.<\/p>\n<h3>Step 8: Configure Subdomains<\/h3>\n<p>Each subdomain should have its own SPF, DKIM, and DMARC record. Start in monitoring mode and gradually move to stricter policies.<\/p>\n<h3>Step 9: Move to a Stricter DMARC Policy<\/h3>\n<p>Transition gradually: p=none \u2192 p=quarantine \u2192 p=reject. Keep checking reports to avoid accidental blocking of legitimate messages.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"the-bottom-line\"><\/span>The Bottom Line<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Throughout this guide, we explored why DMARC failures happen and how to tackle them. You\u2019ve learned how SPF and DKIM alignment, subdomain policies, and proper monitoring all work together to keep your emails authenticated and reaching inboxes reliably.<\/p>\n<p>So, how confident are you that all your emails will pass authentication?<br \/>\nIf any of your sending sources are misconfigured or your lists aren\u2019t clean, legitimate messages could still fail. Therefore, tools like <a href=\"http:\/\/EmailVerify.io\" target=\"_blank\" rel=\"noopener\">EmailVerify.io<\/a> are absolutely crucial to help ensure your recipient lists are verified, supporting full DMARC compliance and reducing the risk of bounces or failures.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions-faqs\"><\/span>Frequently Asked Questions (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<style>#sp-ea-1897 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-1897.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-1897.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-1897.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-1897.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-1897.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1769170054\"><div id=\"sp-ea-1897\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\"><div class=\"ea-card ea-expand sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18970\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18970\" aria-controls=\"collapse18970\" href=\"#\" aria-expanded=\"true\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> 1. Can DMARC Fail Even If SPF and DKIM Pass?<\/a><\/h3><div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse18970\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18970\"> <div class=\"ea-body\"><p>Yes, it can. DMARC checks alignment, not just authentication. If the domains in SPF or DKIM don\u2019t match the visible From address, a DMARC failure can occur even when SPF and DKIM pass.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18971\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18971\" aria-controls=\"collapse18971\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> 2. How Often Should I Review My DMARC Setup?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse18971\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18971\"> <div class=\"ea-body\"><p>Regularly. Ideally, review reports at least once a month. Frequent checks help spot new sending sources, subdomain changes, or third-party services that could trigger DMARC failures.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18972\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18972\" aria-controls=\"collapse18972\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> 3. Do Subdomains Need Their Own DMARC Records?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse18972\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18972\"> <div class=\"ea-body\"><p>Yes. Each subdomain that sends emails should have its own SPF, DKIM, and DMARC records. Otherwise, strict DMARC policies on the main domain can cause legitimate messages from subdomains to fail.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18973\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18973\" aria-controls=\"collapse18973\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> 4. How Do Forwarding Servers Affect DMARC Compliance?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse18973\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18973\"> <div class=\"ea-body\"><p>Forwarding can break SPF alignment, leading to DMARC failures. Implementing ARC (Authenticated Received Chain) or relaxed alignment can help maintain authentication when emails are forwarded.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18974\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18974\" aria-controls=\"collapse18974\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> 5. Can Mailing List Emails Fail DMARC Checks?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse18974\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18974\"> <div class=\"ea-body\"><p>Yes. Many mailing lists modify headers, which can disrupt SPF and DKIM alignment. Using separate subdomains for campaign emails or ARC helps prevent failures and preserves deliverability.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-18975\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse18975\" aria-controls=\"collapse18975\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> 6. How Can I Identify Which Service Is Causing DMARC Failures?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse18975\" data-parent=\"#sp-ea-1897\" role=\"region\" aria-labelledby=\"ea-header-18975\"> <div class=\"ea-body\"><p>Check your DMARC aggregate and forensic reports. Look for failing IP addresses or misaligned sender domains. Monitoring tools can also visualize failures and help pinpoint problematic email service providers.<\/p><\/div><\/div><\/div><\/div><\/div>\n<div class=\"blogDetailCtaWrapper\">\n<div class=\"blogDetailCtaContainer\">\n<p class=\"ctaMainHeading\">Verify that all sending sources are authorized and aligned before moving to strict policies to protect deliverability and reputation.<\/p>\n<p><a class=\"ctaButton\" href=\"https:\/\/www.emailverify.io\/services\/email-verify\/\" target=\"_blank\" rel=\"noopener\">Check Your Email Authentication<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Validity\u2019s latest research on DMARC adoption says 84% of domains that appear as senders in people\u2019s inboxes don\u2019t even have a DMARC record. In plain terms, this leads to: Email spoofing Phishing attacks Unauthorized use of your domain Emails landing in spam or being rejected High bounce rates from invalid emails Brand reputation damage Lost [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1914,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-1896","post","type-post","status-publish","format-standard","has-post-thumbnail","category-compliance-and-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why DMARC Failures Happen and What You Can Do to Fix Them<\/title>\n<meta name=\"description\" content=\"Emails landing in spam or spoofed domains? Learn why DMARC fails, how to fix it, and keep your emails secure and trusted.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.emailverify.io\/blog\/why-dmarc-failures-happen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why DMARC Failures Happen and What You Can Do to Fix Them\" \/>\n<meta property=\"og:description\" content=\"Emails landing in spam or spoofed domains? 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