Email Security
Email Security Learning Center
Understand DMARC, SPF, and DKIM email authentication — explained in plain English.
Understand the email authentication protocols that protect your domain from spoofing, phishing, and fraud. These guides explain SPF, DKIM, and DMARC in plain English — no prior expertise required.
Email Authentication Fundamentals
- What is DMARC? — An introduction to Domain-based Message Authentication, Reporting, and Conformance
- SPF Explained — How Sender Policy Framework validates your email senders
- DKIM Explained — How DomainKeys Identified Mail signs and verifies your messages
- DMARC Policies — Understanding none, quarantine, and reject enforcement policies
- Alignment Modes — Relaxed vs strict alignment and why it matters for DMARC
Troubleshooting & Best Practices
- Common SPF Issues — Diagnose and fix SPF authentication failures
- DKIM Failures — Troubleshoot DKIM signature and verification problems
- DNS Propagation — Understanding propagation delays when updating DNS records
Start Protecting Your Domain
SenderClarity monitors your SPF, DKIM, and DMARC records around the clock and explains what's happening in plain English. Start your free 21-day trial — no credit card required.
You can also test your domain right now with our free tools:
- SPF Checker — Validate your SPF record
- DKIM Checker — Verify DKIM signing
- DMARC Checker — Analyze your DMARC policy