Why DKIM Passes but DMARC Still Fails

January 5, 2026 • InboxGreenEmail Team

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Why DKIM Passes but DMARC Still Fails

As a SaaS founder or marketer, you know how crucial it is for your emails to land in the inbox and not get stuck in spam folders. You may have set up DKIM correctly, and your emails are passing DKIM checks. However, you still see DMARC failures. This situation can be frustrating, especially when you are trying to maintain a good domain reputation and ensure deliverability. When DMARC fails, it can lead to bounced emails, warnings in Gmail, and ultimately, a negative impact on your sender reputation.

Understanding why DKIM passes but DMARC fails is essential. This issue often arises from misconfigurations or misunderstandings about how these authentication methods work together. Let’s dive into this problem and explore how to resolve it effectively.

At a glance

  • This issue affects anyone managing email sending for their domain.
  • This article will guide you through diagnosing and fixing DMARC failures despite DKIM passing.
  • By following the steps, you will improve your email deliverability and domain reputation.

When this problem shows up in real life

DMARC failures can manifest in various ways in your daily operations. Here are a couple of concrete examples:

  • Gmail Headers: You may notice in the email headers that DKIM shows "pass," but DMARC shows "fail." For example:
    • 
Authentication-Results: mx.google.com; dkim=pass [email protected]; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=yourdomain.com
  • Support Tickets: You might receive tickets from users stating they did not receive your emails, and upon checking, you find DMARC failures in the logs.

These situations can create confusion and lead to lost opportunities. Understanding the root cause is essential for resolving these issues quickly.

Step by step: DMARC setup

  1. Check your DKIM setup.

    Ensure that DKIM is set up correctly. You can use a DKIM Checker to verify this.

  2. Verify your SPF record.

    DMARC relies on both SPF and DKIM. Make sure your SPF record is correctly configured. Here’s an example for Google Workspace:

    
v=spf1 include:_spf.google.com ~all
  3. Set up your DMARC record.

    Your DMARC record must be configured properly to align with your DKIM and SPF settings. A simple DMARC record looks like this:

    
v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1

  4. Check alignment.

    Ensure that the "From" address aligns with the domains used in DKIM and SPF. If they do not match, DMARC will fail.

  5. Test your setup.

    After making changes, use the InboxGreen checker to validate your DKIM, SPF, and DMARC records.

Common mistakes

  • Symptom: DKIM passes, but DMARC fails.
    Cause: DKIM and SPF domains do not match the "From" address.
    Fix: Ensure that the domains used in DKIM and SPF align with the "From" address.
  • Symptom: SPF record is too long or complex.
    Cause: Exceeding the DNS lookup limit can cause SPF to fail.
    Fix: Simplify your SPF record or use fewer includes.
  • Symptom: DMARC reports show high failure rates.
    Cause: Misconfigured DMARC policy.
    Fix: Review and adjust your DMARC policy to match your sending practices.
  • Symptom: Emails are still landing in spam.
    Cause: Poor domain reputation due to previous issues.
    Fix: Monitor your sending practices and improve engagement metrics.

Troubleshooting when it still fails

If your DKIM is passing but DMARC is still failing, here are some troubleshooting steps:

  • Check the Authentication-Results header:
    Look for discrepancies in the results. If DKIM passes but DMARC fails, it indicates alignment issues.
  • Verify SPF and DKIM alignment:
    Ensure that both records align with the "From" domain. If they do not match, DMARC will fail.
  • Use the InboxGreen checker:
    Run a check with the InboxGreen checker to see if there are any issues with your records.
  • Review provider-specific logs:
    Check your email service provider’s logs for any additional error messages that could shed light on the issue.

Related checks you should run

In addition to checking DKIM and DMARC, ensure you look into the following:

  • SPF, DKIM, DMARC alignment
  • DNS TTL and propagation delays
  • Domain reputation, bounces, spam reports
  • List quality and engagement patterns

FAQ

Why is SPF still failing on Google Workspace after I added the record?

SPF failures can occur if the record is not correctly formatted or if there are too many DNS lookups. Ensure your SPF record is within the limits and correctly includes all sending sources.

How long do DNS changes take to apply on Microsoft 365?

DNS changes can take anywhere from a few minutes to 48 hours to propagate. It often depends on the TTL settings of your DNS records.

Can I use more than one SPF include with this setup?

Yes, you can include multiple SPF records, but be mindful of the 10 DNS lookup limit. If you exceed this, SPF will fail.

What should I do if my DMARC reports show high failure rates?

Investigate the sources of the failures. Check for alignment issues, misconfigured records, or unauthorized sending domains. Adjust your settings accordingly.

What to do next

Now that you have a better understanding of why DKIM passes but DMARC fails, take action. Start by checking your DKIM, SPF, and DMARC records using the InboxGreen checker. Make the necessary adjustments based on the steps outlined in this article. Regularly monitor your email performance and stay proactive about your domain's reputation. This will help you maintain high inbox placement rates and improve your overall email deliverability.

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