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What is DMARC?

Domain-based Message Authentication Reporting and Conformance (DMARC) is a method of authenticating email messages. A DMARC policy tells a receiving email server what to do after checking a domain's SPF and DKIM records.

DMARC is essential for preventing email spoofing. Without it, attackers can easily impersonate your domain (e.g., sending from [email protected] without authorization) to carry out phishing attacks. Together, SPF, DKIM, and DMARC function like a comprehensive background check on email senders to verify their identity.

[Image of the email authentication workflow showing SPF, DKIM, and DMARC verification steps]

What is a DMARC Policy?​

A DMARC policy determines the fate of an email that fails SPF or DKIM checks. Instead of human-readable sentences, these policies are stored as machine-readable commands in a DNS TXT record.

Example Policy Breakdown:​

v=DMARC1; p=quarantine; adkim=s; aspf=s;

  • v=DMARC1: Indicates this is a DMARC TXT record.
  • p=quarantine: The "Policy" tag. Tells the server to move failed emails to the spam/quarantine folder.
    • p=none: Allows failed emails to go through (monitor mode).
    • p=reject: Instructs servers to block failed emails entirely.
  • adkim=s: "Strict" DKIM alignment. (Can be set to r for "relaxed").
  • aspf=s: "Strict" SPF alignment.

What is a DMARC Report?​

DMARC allows administrators to receive reports about which emails are passing or failing authentication. These reports are vital for:

  1. Identifying if legitimate emails are failing SPF/DKIM.
  2. Detecting when spammers are attempting to spoof your domain.

Typically, reports are sent to a third-party service to be visualized. To enable this, the rua tag is added: v=DMARC1; p=reject; rua=mailto:[email protected];

What is a DMARC Record?​

A DMARC record is a DNS TXT record that specifically contains a DMARC policy. It is stored under a specialized name that starts with _dmarc.

Example of a DMARC DNS TXT Record:​

NameTypeContent (Value)TTL
_dmarc.example.comTXTv=DMARC1; p=quarantine; adkim=r; aspf=r;32600

[Image of a DMARC record structure in a DNS management interface]

DMARC for Non-Sending Domains​

Even if your domain does not send emails, you should still have a DMARC record. This prevents spammers from using your domain name. A "parked" domain should have a policy that rejects all emails (p=reject), effectively telling the world: "I don't send email; if you see one from me, it's fake."

The Complete Email Security Stack​

By implementing DMARC, you have completed the full 2026 security implementation:

  • MX Records: Routes your mail.
  • SPF: Authorizes your senders.
  • DKIM: Signs your messages digitally.
  • DMARC: Governs the final enforcement and reporting.

Master Your Domain Authority​

In the global business landscape of 2026, from the USA to India and beyond, DMARC is the difference between a Reliable Email Provider and a domain that gets blacklisted. Protecting your brand's "Tiwala" (trust) starts with these technical safeguards.

Would you like me to help you generate a DMARC record with a "p=none" policy to start monitoring your domain traffic without risking delivery?