SPF Basics

Foundational guides to understanding Sender Policy Framework.

How SPF Works: The Complete Authentication Flow Explained

Understand exactly how SPF email authentication works, from DNS lookups to pass/fail results. Learn about SPF mechanisms, qualifiers, and what happens when checks fail.

SPF FAQ: Frequently Asked Questions About SPF Records

Answers to common SPF questions: multiple records, propagation time, DNS lookups, combining includes, and more. Get your SPF questions answered.

What is SPF? A Plain-English Guide

Learn what SPF (Sender Policy Framework) is, why it matters for email deliverability, and how it helps prevent email spoofing. No technical jargon required.