{"id":16843,"date":"2025-03-21T11:09:00","date_gmt":"2025-03-21T11:09:00","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=16843"},"modified":"2025-10-14T14:18:13","modified_gmt":"2025-10-14T14:18:13","slug":"why-is-dmarc-failing","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/why-is-dmarc-failing\/","title":{"rendered":"DMARC Fail: Causes, Implications, and Solutions"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A DMARC fail is when an email sent from a domain fails to pass authentication checks, leading to potential rejection or quarantining. Understanding why DMARC fails is essential to safeguarding your domain from phishing and spoofing threats and ensuring high email deliverability rates. DMARC authentication, an email security protocol, works with SPF (Sender Policy Framework) and <a href=\"https:\/\/easydmarc.com\/blog\/glossary\/dkim\/\">DKIM<\/a> (DomainKeys Identified Mail) to verify the legitimacy of emails sent from your domain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Key causes for <a href=\"https:\/\/easydmarc.com\/blog\/glossary\/dmarc\/\">DMARC (Domain-based Message Authentication, Reporting &amp; Conformance)<\/a> failure include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Emails landing in spam folders instead of inboxes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Complete rejection of messages by receiving mail servers<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Delivery delays affecting time-sensitive communications<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Damage to your domain&#8217;s sending reputation<\/span><\/li>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Potential security alerts for your recipients<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When you encounter a DMARC error, it signals that something in your email authentication chain isn&#8217;t working properly. This authentication problem can significantly impact your email deliverability and business communications.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">What Causes DMARC to Fail?<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Misconfigured DKIM signatures<\/strong> \u2013 Your digital signatures may contain errors in the DNS records or cryptographic keys, preventing proper verification of your email&#8217;s authenticity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Third-party provider misalignments<\/strong> \u2013 Services sending emails on your behalf (like marketing platforms or CRMs) may not be properly authorized in your DMARC policy, causing authentication failures\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Email forwarding issues<\/strong> \u2013 When messages are forwarded, the original authentication data can be altered or lost, triggering DMARC failures even for legitimate communications<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Domain spoofing <\/strong>\u2013 <\/span><\/span><span style=\"font-weight: 400;\">Malicious actors may be attempting to impersonate your domain, which DMARC correctly identifies and blocks, though this can be confused with legitimate mail failures<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This blog will explore DMARC authentication failures. We&#8217;ll start by defining what DMARC failure means and how it affects email delivery. Then we&#8217;ll examine common causes behind these failures, including configuration errors, third-party sending issues, and implementation mistakes. Finally, we&#8217;ll provide practical solutions to fix DMARC problems, offering troubleshooting steps and best practices to improve your email deliverability and strengthen security.<\/span><\/p>\n<h2><b>What does DMARC Failure Mean?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">DMARC failure occurs when an email sent from your domain does not pass the DMARC authentication check, which relies on both <a href=\"https:\/\/easydmarc.com\/blog\/exclaimer-spf-and-dkim-configuration\/\">SPF and DKIM authentication<\/a> and domain alignment between SPF, DKIM, and the email\u2019s \u201cFrom\u201d address. Domain alignment, the core concept of DMARC, verifies that the email address in the \u201cFrom\u201d email header matches the actual sender. This alignment requires that both the domain in the SPF check (based on the Envelope From or Return-Path address) and the DKIM signing domain (represented as d=example.net) match the domain shown in the \u201cFrom\u201d address.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-16844 size-large\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/05\/Email-Header-1024x270.png\" alt=\"Email-Header\" width=\"1024\" height=\"270\" \/><\/p>\n<p><span style=\"font-weight: 400;\">When either SPF or DKIM is misaligned with the \u201cFrom\u201d domain, DMARC will fail, indicating that the email could be unauthorized or fraudulent. Proper <a href=\"https:\/\/easydmarc.com\/blog\/centercode-spf-and-dkim-configuration\/\">SPF and DKIM alignment<\/a> is essential to secure your domain and prevent misuse.\u00a0<\/span><\/p>\n<h2><b>Causes of Failure<\/b><\/h2>\n<h3><b>1. DKIM Signature Not Set Up<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">If you don\u2019t configure a custom DKIM signature, email providers like Google and Microsoft will automatically sign your outgoing emails with their default DKIM key (e.g., d=domain.gappssmtp.com for Google). These default signatures don\u2019t represent your domain; instead, they reflect the email provider\u2019s domain. To set up DKIM under your domain, you need to configure the correct DKIM entries in your DNS provider such as GoDaddy, Rackspace, or Cloudflare.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In this case, DMARC fails because of email domain misalignment. If someone receives an email from example.com but it\u2019s signed as example.gappssmtp.com or example.onmicrosoft.com, DMARC won\u2019t recognize it as authorized. You can view examples of this issue, along with screenshots, in the EasyDMARC dashboard.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A<\/span> <i><span style=\"font-weight: 400;\">DMARC fail<\/span><\/i><i><span style=\"font-weight: 400;\"> due to Google Workspace using the default DKIM Signature, and not authorized in the SPF<\/span><\/i> <i><span style=\"font-weight: 400;\">Record<\/span><\/i><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-43010 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Google-Workspace.png\" alt=\"DMARC Fail - Google Workspace\" width=\"602\" height=\"107\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Google-Workspace.png 602w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Google-Workspace-300x53.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/p>\n<p><i><span style=\"font-weight: 400;\">A DMARC fail due to Microsoft 365 using the default DKIM Signature, and not authorized in the SPF Record<\/span><\/i><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-43013 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-M365.png\" alt=\"DMARC Fail - M365\" width=\"602\" height=\"112\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-M365.png 602w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-M365-300x56.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Here&#8217;s how you can set up SPF, DKIM, and DMARC for <a href=\"https:\/\/easydmarc.com\/blog\/spf-dkim-dmarc-setup-guide-for-g-suite-gmail-for-business\/\" target=\"_blank\" rel=\"noopener\">Google Workspace<\/a> and <\/span><a href=\"https:\/\/easydmarc.com\/blog\/microsoft-365-spf-and-dkim-configuration-step-by-step\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Microsoft 365<\/span><\/a><span style=\"font-weight: 400;\"> mail.\u00a0<\/span><\/p>\n<h3><b>2. Not Activating Protocols for Third-Party Providers<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">If you use third-party service providers like MailChimp, SendGrid, HubSpot, and ZenDesk for your marketing, transactional, and help desk emails, you have to permit them to send emails on your domain\u2019s behalf.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That is achieved by pointing DNS entries from your DNS Provider (like GoDaddy, Cloudflare, or Rackspace) to authorize and \u2018whitelist\u2019 the given servers.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These providers sign your emails with their domain name by default, and your recipients generally see \u201cvia sendgrid.net\u201d, \u201cvia thirdpartyprovider.com\u201d messages on your emails, thus leading to DMARC misalignment and DMARC failure.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Below, you can see examples of this case with screenshots from the EasyDMARC dashboard.<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">A DMARC fail due to emails sent through a SendGrid account not properly signed with DKIM and SPF for a unique domain.<\/span><\/i><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43016 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-SendGrid.png\" alt=\"DMARC Fail - SendGrid\" width=\"602\" height=\"85\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-SendGrid.png 602w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-SendGrid-300x42.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/p>\n<p><i><span style=\"font-weight: 400;\">A DMARC fail due to emails sent through a ZenDesk account not properly signed with DKIM and SPF for a unique domain.<\/span><\/i><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43019 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Zendesk.png\" alt=\"DMARC Fail - Zendesk\" width=\"602\" height=\"76\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Zendesk.png 602w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/DMARC-Fail-Zendesk-300x38.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/p>\n<h3><b>3. Email Forwarding Has Changed the Original Message<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Forwarded emails can often trigger DMARC failures due to the way they are processed by intermediary servers. When an email is forwarded, it may pass through one or more intermediate servers before reaching its final destination. These intermediary servers often have IP addresses that differ from the original sender&#8217;s, which can lead to SPF check failures, as the new IP addresses aren\u2019t typically included in the original sender\u2019s SPF record. Although DKIM is generally unaffected by forwarding, modifications by intermediary servers \u2013 such as adding or changing message footers \u2013 can sometimes disrupt the DKIM signature.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Read more about SPF\/DKIM\/DMARC behavior during<\/span><a href=\"https:\/\/easydmarc.com\/blog\/email-forwarding-and-dmarc-dkim-spf\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\"> forwarding<\/span><\/a><span style=\"font-weight: 400;\"> in this article.<\/span><\/p>\n<h3><b>4. Your Domain Has Been Spoofed<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">If you are a victim of spoofing, cybercriminals are sending emails that appear to come from your domain. Why does DMARC fail in this case? These unauthorized sources don\u2019t pass <a href=\"https:\/\/easydmarc.com\/blog\/elastic-email-spf-and-dkim-configuration\/\">SPF and DKIM authentication<\/a> checks, which results in DMARC failure. These failed attempts are categorized under the \u2018Threat\/Unknown\u2019 tab in your EasyDMARC Dashboard.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43022 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/Domain-Spoofing.png\" alt=\"Domain Spoofing\" width=\"602\" height=\"105\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/Domain-Spoofing.png 602w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2024\/09\/Domain-Spoofing-300x52.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/p>\n<h2><b>DMARC Fails<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Here are some general guidelines for fixing DMARC fails.<\/span><\/p>\n<h3><b>Ensure SPF Alignment<\/b><\/h3>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Check that your SPF record includes all legitimate sending sources for your domain. If you&#8217;re using third-party email services (like marketing platforms or web hosts), ensure their sending IP addresses are included in your SPF record.<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure that the Envelope From or Return-Path address used during email delivery matches your domain or the domains you\u2019ve authorized in your SPF record.<\/span><\/li>\n<\/ul>\n<h3><b>Configure DKIM Properly<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set up a DKIM digital signature for your domain to sign outgoing emails. If you use third-party email services, ensure they sign emails with your domain\u2019s DKIM key (not their default).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check that the d= value in the DKIM signature matches your domain.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\">You can use a <a style=\"font-size: revert;\" href=\"https:\/\/easydmarc.com\/tools\/dkim-lookup\">DKIM checker<\/a><span style=\"font-weight: 400;\"> to be 100% sure your DKIM signature is properly set up.<\/span><\/li>\n<\/ul>\n<h3><b>Check Your Domain Alignment<\/b><\/h3>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">For DMARC to pass, the domain in the From email header must match the domain used in the <a href=\"https:\/\/easydmarc.com\/blog\/mailrelay-spf-dkim-setup\/\">SPF and DKIM checks<\/a>. If you&#8217;re using an email service provider or forwarding service, ensure their systems support proper alignment and don\u2019t modify the message in a way that causes misalignment.<\/span><\/li>\n<\/ul>\n<h3><b>Review Your DMARC Policy<\/b><\/h3>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Ensure your DMARC policy is correctly configured in your DNS settings with a free <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dmarc-lookup\"><span style=\"font-weight: 400;\">DMARC checker<\/span><\/a><span style=\"font-weight: 400;\">. You can also start with a p=none policy for monitoring over the first few weeks. Focus on detecting legitimate sources and <a href=\"https:\/\/easydmarc.com\/blog\/configuration-of-spf-and-dkim-for-esputnik\/\">authenticating them with SPF and DKIM<\/a>, and then gradually shift to p=quarantine or p=reject as you resolve issues. Closely examine your DMARC reports to identify misalignments or authentication failures.<\/span><\/li>\n<\/ul>\n<h3><b>Monitor Your DMARC Reports<\/b><\/h3>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Use DMARC aggregate reports and forensic or <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dmarc-failure-reports\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">failure reports <\/span><\/a><span style=\"font-weight: 400;\">to track which emails are failing DMARC checks. These reports will help you identify which IPs or services are causing SPF or DKIM issues.<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">DMARC reports are usually presented in a complicated XML format. However, EasyDMARC&#8217;s platform transforms these reports into user-friendly data. Our algorithm categorizes the reports into &#8220;Compliant,&#8221; &#8220;Non-Compliant,&#8221; &#8220;Threat\/Unknown,&#8221; and &#8220;Forwarded.&#8221; This categorization helps you focus on critical aspects of your email authentication metrics and address any issues.<\/span><\/li>\n<\/ul>\n<h3><b>Consult with Your Email Service Providers<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If third-party services are involved, work with them to ensure proper configuration of your SPF, DKIM, and DMARC records.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">You can find more about DMARC in our blog on<\/span><a href=\"https:\/\/easydmarc.com\/blog\/dmarc-rfc\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\"> DMARC RFC<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>In Closing\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Understanding DMARC failures is part of protecting your domain from phishing and spoofing attacks and aligns with global best practices demonstrated by <a href=\"https:\/\/easydmarc.com\/blog\/au\/ebook\/2025-state-of-dmarc-adoption-australia-global-insights\/\">DMARC adoption in Australia<\/a>. Proper <a href=\"https:\/\/easydmarc.com\/blog\/hellodialog-spf-and-dkim-configuration\/\">SPF and DKIM configuration<\/a>, along with domain alignment, are essential to pass <\/span><a href=\"https:\/\/easydmarc.com\/blog\/dmarc-step-by-step-guide\/\"><span style=\"font-weight: 400;\">DMARC setup<\/span><\/a><span style=\"font-weight: 400;\"> and checks. Common causes of failure include misconfigured DKIM signatures, third-party service misalignments, email forwarding issues, and domain spoofing. By aligning your domain correctly, monitoring DMARC reports, and ensuring proper configuration, you can minimize these failures and enhance your email security. Tools like EasyDMARC can help streamline the process and resolve issues efficiently.<\/span><\/p>\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>A DMARC fail is when an email sent &#8230;<\/p>\n","protected":false},"author":1,"featured_media":43025,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[204,285,203],"tags":[],"class_list":["post-16843","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-dmarc","category-email-security"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>EasyDMARC | DMARC Fail: Causes, Implications, and Solutions<\/title>\n<meta name=\"description\" content=\"DMARC failure is when your emails fail to pass security checks enforced by DMARC protocols &amp; get rejected or blocked. 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