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DMARC Email Security, Where the Spam and Phishing Ends

DMARC Email Security, Where the Spam and Phishing Ends

In the ever-evolving landscape of online communication, email remains a critical tool for businesses. However, the prevalence of spam and phishing attacks poses a significant threat to the integrity of email communication. Email security isn’t a new thing. More than ever, the concern about internet safety is at an all-time high. Hacking for sport is a thing, and it is in everyone’s best interest to stay vigilant. 

How many of you are getting random emails from faux companies? Emails that look like they are from a reputable company, but something just looks off. The email address has a mixture of numbers and letters, or the content looks like a screenshot of an image. Imposters are growing and while there isn’t much you can do to stop them; you can protect yourself. 

What if this is happening to your company? What if there was some unscrupulous character using your company’s information and offering to scam or phish information from others? Domain-based Message Authentication, Reporting, and Conformance (DMARC) has emerged as a powerful solution to enhance email security and protect against unauthorized use of your domain. 

In this article, we will discuss the world of DMARC and provide detailed steps for its setup to fortify your email defenses.

Understanding DMARC

DMARC is an email authentication protocol that builds on Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) to authenticate emails. It allows senders to specify how their emails should be handled if they fail authentication, providing a means to protect recipients from phishing and spoofing attacks.

A recent study revealed that throughout 2021 the number of valid DMARC policies observed in use rose by 84%, to a total of nearly 5 million unique records, compared to the prior calendar year. This doubles the percentage increase seen in 2020 and reflects an acceleration of growth in the second half of the year. Starting with June, the number of new records seen each month was between three and six times the number seen in the first five months of the year. 

Here’s an overview of how DMARC helps prevent spoofing and phishing:

Authentication Mechanisms

DMARC leverages existing email authentication mechanisms, primarily SPF and DKIM. SPF helps verify that the sending mail server is authorized to send emails on behalf of a domain, while DKIM allows the recipient to check the integrity of the email’s content.

DMARC Record

Domain owners publish a DMARC record in their DNS (Domain Name System) settings. This record includes information about how receivers should handle emails that claim to be from the domain but fail authentication.

Policy Levels

DMARC offers three policy levels that domain owners can set: “none,” “quarantine,” and “reject.”

None: The domain owner is only interested in monitoring unauthorized use, and no specific action is taken.

Quarantine: Suspicious emails are placed in the recipient’s spam or junk folder.

Reject: Emails that fail authentication are rejected outright, and they are not delivered to the recipient.


DMARC introduces the concept of alignment, ensuring that the domain used in the visible “From” header aligns with the domains authenticated through SPF and DKIM. This prevents attackers from using deceptive tactics in the email header.

Reporting Mechanism

DMARC includes a reporting mechanism that enables domain owners to receive feedback reports from email receivers. These reports provide insights into how their domain is being used, including details on failed authentication attempts.

Phishing Prevention

By enforcing DMARC policies, organizations can significantly reduce the likelihood of phishing attacks. When a phishing email claiming to be from a protected domain is received, DMARC allows the domain owner to instruct email providers to take appropriate actions, such as moving the email to the spam folder or rejecting it altogether. 

Global Adoption

DMARC has gained widespread adoption, and major email providers, including Gmail, Yahoo, and Microsoft, support and enforce DMARC policies. This global adoption strengthens the effectiveness of DMARC in preventing spoofing and phishing.

Continuous Monitoring

Domain owners can continuously monitor DMARC reports to identify patterns of abuse, track authentication failures, and take proactive measures to enhance email security.


DMARC provides an additional layer of security against email-based attacks by ensuring that emails claiming to be from a particular domain are legitimate. It helps protect both the domain owner and the recipients from falling victim to phishing scams and other malicious activities that rely on email spoofing. Organizations are encouraged to implement and properly configure DMARC to enhance email security and build trust in their email communications.

While DMARC is an effective tool for preventing email spoofing and phishing, its implementation can sometimes face challenges. To help, here are potential issues that organizations may encounter during DMARC implementation:

  • Lack of Awareness: Some organizations may need to be made aware of DMARC or its benefits. Education and awareness-raising efforts are crucial to ensuring that domain owners understand the importance of implementing DMARC and the potential risks of not doing so.
  • Incomplete SPF/DKIM Deployment: DMARC relies on the proper deployment of SPF and DKIM. If these authentication mechanisms are not properly configured or if there are inconsistencies, DMARC implementation may not be effective.
  • Existing Email Delivery Issues: Organizations that have pre-existing email delivery issues may face challenges during DMARC implementation. For example, if legitimate emails are being marked as spam, implementing DMARC may exacerbate these problems. It’s important to address existing email deliverability issues before implementing DMARC.
  • Phasing in DMARC Policies: Organizations need to consider how they phase in DMARC policies carefully. Starting with a policy of “none” for monitoring is common but transitioning to “quarantine” or “reject” can impact legitimate email delivery. Gradual policy enforcement with monitoring and analysis is recommended.
  • Handling False Positives and Negatives: False positives (legitimate emails marked as spam) and false negatives (malicious emails not caught) can occur during DMARC implementation. Organizations must carefully monitor reports and adjust policies to minimize these issues.
  • Third-party Services and Forwarding: Organizations using third-party services or email forwarding may face challenges as these services may modify the email headers or originate emails on behalf of the organization. Ensuring that third-party services align with DMARC policies is crucial.
  • Legacy Systems: Older or legacy email systems may not fully support DMARC, SPF, or DKIM. Organizations with legacy systems may need to upgrade or find alternative solutions to ensure compatibility.
  • Resource Constraints: Smaller organizations with limited resources may find allocating the necessary time and expertise for DMARC implementation challenging. It’s important to allocate sufficient resources and consider seeking external support if needed.
  • Policy Alignment Challenges: Achieving alignment between SPF, DKIM, and the “From” domain can be challenging, especially when dealing with multiple email sources, third-party vendors, or complex email infrastructures.
  • Managing Reports: DMARC generates XML-based reports that need to be processed and analyzed. Organizations may face challenges in managing and interpreting these reports effectively.
  • Resistance to Policy Enforcement: Some organizations may be hesitant to enforce DMARC policies because of concerns about potential disruption to legitimate email delivery. However, without enforcement, the full security benefits of the DMARC may not be realized.

How to Set Up DMARC

  1. Conduct a Domain Audit:

   Before implementing DMARC, conduct a comprehensive audit of your domain’s current email authentication setup. Ensure that SPF and DKIM are correctly configured.

  1. Generate DMARC Record:

   Create a DMARC TXT record in your domain’s DNS settings. Specify the policy for failed authentication, reporting options, and contact information. 

  1. Gradual Policy Implementation:

  To avoid disrupting legitimate email flows, start with a “none” policy. This allows you to monitor the impact without affecting the delivery of emails.

  1. Analyze DMARC Reports:

 Regularly review the DMARC aggregate reports to identify sources of failed authentication. This step is crucial for fine-tuning your DMARC policy and addressing any potential issues.

  1. Move to a Strict Policy:

 Once you are confident in the accuracy of your email authentication, transition to a more stringent policy, such as “quarantine” or “reject,” to actively combat phishing attempts.

  1. Monitor and Adjust:

 Continuously monitor DMARC reports and adjust your policy as needed. Regularly check for new legitimate sources of email sending and update your SPF and DKIM records accordingly.

Implementing DMARC is a proactive step toward securing your email communication and protecting your brand from malicious actors. By following these detailed steps, you can establish a robust email authentication framework, reducing the risk of spam, phishing, and unauthorized use of your domain. Stay vigilant, adapt to emerging threats, and ensure the integrity of your email communication in the digital age.

To overcome these issues, organizations should carefully plan their DMARC implementation, conduct thorough testing, and monitor the results continuously. Additionally, seeking expertise from professionals, like WDB Agency in email authentication and security, can help ensure a smooth and effective DMARC deployment.

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