What is DMARC Record?
DMARC stands for Domain-based Message Authentication, Reporting, and Conformance, which is an email authentication protocol that builds on top of two other protocols, Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). A DMARC record is a DNS record used to indicate how incoming mail from a specific domain should be handled and verified
Why Configure a DMARC Record?
Configuring a DMARC record helps protect your domain from email spoofing and phishing attacks, and also provides visibility and control over how your domain is used to send email. By publishing a DMARC record, domain owners can instruct receiving mail servers to reject messages sent from unauthorized email servers, reducing the effectiveness of email spoofing attacks.
Steps to Configure DMARC Record
Identify the email addresses that will receive DMARC reports for your domain
Create a DMARC record in your DNS zone file. The record should contain the following mandatory tags:
v=DMARC1: This tag indicates that this is a DMARC record and specifies the DMARC version.
p=reject: This tag specifies the policy for how messages that fail DMARC should be handled by receiving mail servers. In this case, messages that fail DMARC should be rejected outright.
ruf=mailto:email@example.com: This tag specifies the email address that should receive failure reports from receiving mail servers.
rua=mailto:firstname.lastname@example.org: This tag specifies the email address that should receive aggregate reports from receiving mail servers.
Test your DMARC configuration before publishing it widely. Use an online DMARC analyzer tool to check if your DMARC record is valid and properly configured.
Once your DMARC record is properly configured and tested, update your DNS records to publish the DMARC record. Check the documentation of your DNS provider to know how to add a DMARC record to your DNS zone file.
Monitor your DMARC reports regularly and look for any unexpected behavior, such as spoofed emails or unauthorized use of your domain. Based on your analysis of the reports, adjust your DMARC policy and take other measures to secure your domain’s email ecosystem.
Best Practices for DMARC Configuration
When configuring DMARC for your domain, follow these best practices to maximize the effectiveness of the protocol:
Start with a relaxed policy and monitor your DMARC reports closely, gradually moving towards a stricter policy as you gain confidence in your email ecosystem and your users’ behavior.
Implement DKIM and SPF authentication protocols for your domain, as DMARC builds on these protocols.
Publish a DMARC record for all subdomains of your domain, to ensure that all email messages sent from your domain are covered by the DMARC policy.
Add your organization’s logo to your DMARC record, to enable receivers to display the logo in email clients that support it. This enhances brand recognition and instills trust in your emails.
Regularly review and update your DMARC record, especially when you make changes to your email infrastructure, such as switching email providers or domains.
Configuring a DMARC record is an essential step towards securing your domain’s email ecosystem and protecting your users from email spoofing and phishing attacks. By following the steps outlined in this article and adhering to best practices, you can achieve a higher level of email authentication and strengthen your brand’s reputation. Dive into the subject matter using this recommended external content. Explore this educational material.
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