DDSystems: Blog

2024 06 14 DDS - June 2024 Blog Post 1

The Importance of Updating Your DMARC Policy for Enhanced Email Security

Strengthen Your Email Security with DMARC

At DDSystems, we prioritize your email security. Our website,, and primary phone number, 410-487-1274, are your gateways to enhancing your IT infrastructure.

The Vital Role of DMARC in Email Security

Email remains a cornerstone of both personal and professional communication. However, it is also a primary target for cyber attacks. Recent advisories from the FBI and NSA emphasize a crucial step for all email users and administrators: updating your DMARC policy. This recommendation is particularly relevant in light of Google’s new security measures for Gmail users, underscoring the critical importance of domain authentication in mitigating email-based threats.

Understanding DMARC

DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email validation system that shields domain owners from spoofing and phishing attacks. It allows domain owners to publish policies in their DNS records specifying the mechanisms (such as SPF and DKIM) used to authenticate their emails and how receiving mail servers should handle messages that fail these checks.

Key Configurations for DMARC Policies:

  • v=DMARC1; p=quarantine: Instructs the receiving email server to quarantine emails that fail DMARC validation, treating them as spam.
  • v=DMARC1; p=reject: Directs the email server to outright reject and block emails that fail DMARC checks.

The Importance of a Properly Configured DMARC Policy

Implementing a DMARC policy significantly boosts your email security by reducing the risk of email spoofing and phishing attacks. Here are some key benefits:

Protection Against Phishing Attacks: Phishing attacks often spoof trusted domains to deceive recipients. A correctly configured DMARC policy ensures only legitimate emails from your domain reach recipients, reducing successful phishing attempts.

Maintaining Brand Integrity: Email spoofing can harm your brand’s reputation if attackers send fraudulent emails appearing to come from your domain. Implementing a strict DMARC policy prevents unauthorized use of your domain and maintains your brand’s integrity.

Improved Email Deliverability: A well-configured DMARC policy can enhance your email deliverability rates. Email providers are more likely to trust and prioritize emails from domains with strong authentication policies, ensuring your legitimate emails reach their intended recipients.

Steps to Update Your DMARC Policy

Updating your DMARC policy involves several steps, typically managed within your email domain’s DNS settings. Here’s how to ensure your DMARC policy is correctly configured:

  1. Assess Your Current DMARC Policy: Check your domain’s DNS records to see if a DMARC policy is in place. If not, create one.
  2. Choose the Right Policy: Decide whether to implement a “quarantine” or “reject” policy based on your email security needs. The “reject” policy provides the highest level of protection by blocking non-compliant emails, while the “quarantine” policy offers substantial protection by sending suspicious emails to the spam folder.
  3. Update Your DNS Records: Access your domain’s DNS settings and update the DMARC record. For example, a DMARC record with a “reject” policy might look like this: “v=DMARC1; p=reject;”.
  4. Monitor and Adjust: After implementing your DMARC policy, monitor its impact on your email traffic. Use the reporting feature (specified by the “rua” tag) to receive feedback on email authentication results and adjust as necessary.

The Role of IT Teams and Web Hosting Companies

If you manage a custom email domain, involve your IT team or web hosting company in updating your DMARC policy. They can provide technical expertise to ensure the policy is correctly configured and effectively protecting your domain. For users relying on web-based email services like Gmail, these settings are typically managed by the service provider, so no additional action is needed.

Don’t Leave Your Email at Risk

Updating your DMARC policy is a vital step in strengthening your email security. By protecting your domain against spoofing and phishing attacks, you safeguard your information and maintain the trust and integrity of your communications. Don’t wait for a security breach to take action—review and update your DMARC policy today to stay ahead of potential threats.

For assistance or more information, contact DDSystems at 410-487-1274 or visit