DMARC Implementation Guide

Email domain spoofing is one of the most common attack vectors used in phishing campaigns. DMARC, combined with DKIM and SPF, provides a powerful framework to prevent attackers from impersonating your domain. This guide walks you through implementation step by step.

Over 3.4 billion spoofed emails are sent every day. A domain without DMARC enforcement is an open invitation for attackers to impersonate your brand, trick your customers, and damage your sender reputation. Yet many organisations stall at the monitoring phase (p=none) because they fear breaking legitimate email flows. This guide provides a safe, phased migration path — from initial SPF and DKIM deployment through DMARC monitoring to full enforcement — with real-world examples of common pitfalls and how to resolve them without disrupting email deliverability.

What's inside:

• SPF record creation and validation guide
• DKIM key generation and DNS configuration
• DMARC policy creation (p=none, quarantine, reject)
• Reading and interpreting DMARC reports
• Moving from monitoring to enforcement mode
• Common implementation mistakes and how to avoid them