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How to make sure your DNS records are set up right.

Hey guys! Pepe here the Co-Founder of Mailyser. Check out our latest video guide above, and if you want to learn more about deliverability and run a free test book a call with me using this link:

Let's dive into it!

DNS (Domain Name System) settings are crucial for verifying sender authenticity, improving email deliverability, and protecting against phishing. The key DNS records involved in email authentication include SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance).

SPF and Its Importance

SPF records help mail servers verify that the incoming emails from a domain are sent from authorized mail servers. It prevents email spoofing and ensures that your emails are trusted by the recipient's email servers.

DKIM: The Email Signature

DKIM adds a digital signature to the email's headers. This signature is verified against a public key in the domain's DNS records. It ensures the email has not been tampered with during transit and adds a layer of trust.

DMARC: Combining SPF and DKIM

DMARC uses SPF and DKIM to provide a framework for email authentication, policy enforcement, and reporting. It allows domain owners to specify how email receiving servers should handle unauthenticated emails, adding an extra layer of security and trust.

How to Use Mailyser to check your DNS

Mailyser's platform simplifies the process of checking and configuring your DNS settings for optimal email deliverability. Follow these steps to ensure your DNS settings are correctly configured:

Step 1: Setting Up a Test Campaign

  • Navigate to Mailyser and select the option to create a new email test.

  • Enter the details of your campaign, including the sending date and the keyword for tracking.

Step 2: Downloading Your Audience List

  • Mailyser provides a test/stage environment with real email addresses to send out your campaign and see real-time performance.

  • Download the provided list of contacts for your test campaign.

Step 3: Sending Your Campaign

  • Use the provided list to send your email campaign, ensuring to include the specific keyword for tracking.

Step 4: Analyzing the Results

  • After sending, Mailyser's content algorithms begin scanning your campaign.

  • Check the DNS section for detailed feedback on your SPF, DKIM, and DMARC settings.

Addressing Common Issues

  • Invalid DKIM Signature: This indicates your email's digital signature does not match the public key in your DNS. Ensure your DKIM settings are correctly entered in your DNS records.

  • SPF Failures: Verify that your SPF record includes all the mail servers authorized to send emails on behalf of your domain.

  • DMARC Policy Not Set: Implement a DMARC policy to specify how receiving servers should treat emails failing SPF or DKIM checks.


Ensuring your DNS settings are correctly configured is essential for email deliverability and domain health. Mailyser's comprehensive toolkit offers an intuitive way to test, analyze, and optimize your email campaigns. By following the steps outlined in this guide, you can enhance your email deliverability, protect your domain from spam and phishing attacks, and maintain a strong sender reputation.

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