DMARC Concepts

Technical concepts behind DMARC policies, alignment, and standards.

DMARC Alignment Explained: Relaxed vs. Strict, adkim and aspf

Learn what DMARC alignment means, how relaxed and strict modes work for DKIM (adkim) and SPF (aspf), and when to use each setting for your domain.

DMARC and ARC: How Authenticated Received Chain Fixes Forwarding Issues

Learn how ARC (Authenticated Received Chain) preserves email authentication through forwarding, how it interacts with DMARC, and which providers support it.

DMARC and BIMI: How to Display Your Brand Logo in Email Inboxes

Learn how BIMI displays your brand logo in email inboxes, why DMARC enforcement is required, and the step-by-step path from no DMARC to BIMI-ready.

DMARC Best Practices: A Checklist for Getting It Right

A practical DMARC best practices checklist covering SPF, DKIM, policy rollout, reporting, and ongoing maintenance for reliable email authentication.

DMARC and Email Forwarding: Why Forwarded Emails Fail and How to Fix It

Learn why email forwarding breaks DMARC authentication, how SRS and ARC help, and practical fixes to stop legitimate forwarded emails from failing.

DMARC for Subdomains: How the sp Tag and Subdomain Policies Work

Learn how DMARC policies apply to subdomains, how the sp tag works, and when to create separate DMARC records for subdomains vs using inheritance.

DMARC Policy Levels: None vs Quarantine vs Reject

Understand the three DMARC policy levels — none, quarantine, and reject. Learn when to use each and how to move from monitoring to full enforcement.

DMARC Record Syntax: Every Tag and Parameter Explained

Complete reference for every DMARC tag: v, p, rua, ruf, pct, sp, adkim, aspf, fo, and ri. Includes valid values, defaults, and example records.

RFC 7489: The DMARC Specification Explained in Plain English

A plain-English walkthrough of RFC 7489, the official DMARC specification. Understand what the standard says about policy, alignment, and reporting.

Can You Use DMARC Without DKIM? Understanding the Relationship

Learn whether DMARC works without DKIM, why relying on SPF alone is risky, and why setting up both SPF and DKIM gives you reliable email authentication.