Configuring DMARC for your custom domains

With Gmail   and Yahoo   introducing new standards on February 1, 2024, the importance of domain authentication through DMARC (Domain-based Message Authentication, Reporting, and Conformance) has increased. These standards are in response to the growing concern over email fraud, highlighting the importance of DMARC's role in providing an extra layer of defense against phishing and spoofing for businesses sending branded emails from independent domains. This guide will cover the necessary steps to configure DMARC for your domain, ensuring your email communication meets these updated standards.

Understanding DMARC and Its Benefits

DMARC is an email authentication protocol that allows email domain owners to protect their domain from unauthorized use, commonly referred to as email spoofing. While SPF and DKIM are important for email authentication, DMARC introduces an extra layer of security by working alongside these protocols. It enables domain owners to specify how an email should be processed if it fails authentication checks, ensuring Internet Service Providers (ISPs) can validate sending domains and take action against unauthorized use, aiding in cyber threat mitigation.

Here are the key advantages of implementing DMARC:

  1. Protects your sending reputation: By preventing unauthorized parties from sending emails from your domain, DMARC, with the support of SmartPush's verification process, safeguards your brand's integrity and can positively impact your sender reputation.
  2. Increases email deliverability: Offers insight into email sending activities on your behalf, aiding in the effective management of your email program.
  3. Secures email ecosystem: Establishes uniform policies for handling unauthenticated emails, making the email environment safer and helping your emails to avoid spam filters.
  4. Enables BIMI: With DMARC, you can leverage BIMI (Brand Indicators for Message Identification) to display your logo in supported email clients, enhancing brand visibility and trust.

How DMARC Works

DMARC builds on the authentication processes established by SPF and DKIM, further enhancing email security through policy enforcement and feedback reporting. It authenticates emails and provides guidance to ISPs on handling emails that fail authentication checks. One of the unique features of DMARC is its feedback mechanism, which offers senders detailed reports from ISPs, essential for improving email authentication strategies. DMARC's integration with SPF and DKIM serves to:

  • Enhance verification: DMARC collaborates with SPF and DKIM to authenticate emails, strengthening protections against attempts at spoofing and phishing.
  • Guide ISPs: It outlines explicit actions for ISPs on managing emails that don't pass authentication, facilitating a consistent approach to email delivery.
  • Provide Feedback: A distinctive feature of DMARC is its feedback mechanism, offering senders detailed reports from ISPs. This feedback is crucial for addressing and improving email authentication strategies.

DMARC Policies:

DMARC provides domain owners with the ability to control their email handling through three policies:

  • P=none (Monitoring Mode): Also known as the monitoring strategy, allows all emails to be delivered, regardless of DMARC status, with no action taken by ISPs.
  • P=quarantine: Redirects emails that fail authentication to spam or quarantine folders, offering a measure of safety without outright rejection.
  • P=reject: Prevents the delivery of emails that fail authentication, protecting recipients from potential threats.

Steps to Configure DMARC

1. Access Your Domain Host's Management Console: Log in to the administrative panel provided by your domain hosting service.

2. Locate the DNS Records Section: Find the page where you can update your domain's DNS records.

3. Add a TXT Record for DMARC:

  • In the "Record Name" or "DNS Host Name" field, enter _dmarc. Note that some domain hosts might automatically append your domain name, resulting in
  • In the "Text Value" field, input v=DMARC1; p=none; to start with a monitoring policy. This is the initial setup to observe how your emails perform under DMARC without affecting delivery.

Complying with New Sending Requirements

To ensure high email deliverability under these new standards, strive for a complaint rate below 0.3%, with a target below 0.1%. This rate is calculated by dividing the number of emails marked as spam by your customers by the total number of emails delivered successfully to inboxes. Tools like Google Postmaster Tools   can be useful in effectively monitoring your Gmail complaint rates.

Implementing DMARC for your independent domain is more than just complying with Gmail and Yahoo's new policies; it's a proactive step towards enhancing your email security, protecting your brand, and improving the overall email experience for your recipients. By following the steps outlined above, you can ensure your email communications are authenticated, secure, and more likely to reach your audience's.
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