DMARC Implementation Best Practices: A Guide to Protect Your Domain 1

What is DMARC?

DMARC stands for Domain-based Message Authentication, Reporting, and Conformance. It is an email authentication protocol designed to give domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing or phishing.

Why is DMARC important?

Email is one of the most commonly used attack vectors by cybercriminals. By using DMARC, domain owners can reduce the risk associated with email-based attacks and increase email deliverability, ultimately improving the business’s overall security posture.

DMARC implementation best practices

Here are some best practices to help you implement DMARC:

Start with a policy of none

The first step in implementing DMARC is to start with a policy of none. This means that the domain owner is monitoring email traffic but is not yet enforcing any actions if the email fails authentication checks.

Use SPF and DKIM

DMARC relies on Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) to authenticate emails. SPF checks the IP address of the sending server, while DKIM authenticates the email’s contents. Use both authentication methods to increase the level of assurance on your emails.

Gradually increase policy enforcement

After implementing a policy of none, gradually increase policy enforcement. Start with a policy of quarantine; this means that if an email fails DMARC authentication, it will be placed in the receiver’s spam folder. Then, eventually move to a policy of reject; this means that emails failing DMARC authentication will be rejected by the receiver’s mail server.

Monitor DMARC reports regularly

DMARC provides feedback reports that give the domain owner insight into all emails sent using their domain. Regularly monitor these reports and make changes accordingly. Identify authorized senders and domains, tag fraudsters, and adjust criteria for policy enforcement.

DMARC impact on legitimate email delivery

A common concern with DMARC implementation is that it may impact legitimate email delivery. However, DMARC is designed to reduce the risk of spoofing, not to block authorized senders’ messages. Implementing DMARC correctly should not affect legitimate email delivery.

DMARC resources and tools

Here are some resources and tools that can help with DMARC implementation: is the official website for DMARC. It provides information on DMARC’s technical implementation, best practices, and use cases.

DMARC Analyzer

DMARC Analyzer is a DMARC reporting and analysis tool that provides detailed insights into DMARC reports, including forensic report analysis, threat intelligence, and DMARC compliance monitoring.

Google Postmaster Tools

Google Postmaster Tools is a free tool that enables domain owners to monitor email deliverability to Gmail users, including DMARC compliance.


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Implementing DMARC is an essential step to protect your domain against email-based attacks. Start with a policy of none, use SPF and DKIM, gradually increase policy enforcement, and monitor DMARC reports regularly. With the right tools, you can optimize your DMARC implementation and ensure the highest level of protection.

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DMARC Implementation Best Practices: A Guide to Protect Your Domain 2



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