Resources

Guides, tutorials, and tips for SPF records and email authentication.

Common SPF Errors: Understanding and Fixing SPF Failures

Learn what SPF error codes mean, what causes them, and how to fix common SPF misconfigurations including PermError, SoftFail, and None results.

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 10 DNS Lookup Limit: Why It Exists and How to Fix It

Learn about the SPF 10 DNS lookup limit, why exceeding it causes PermError failures, and practical solutions to optimize your SPF record.

SPF and DNS Records: Understanding Where SPF Lives

Learn how SPF records work within DNS, the relationship between SPF and other DNS record types, and how to find and manage your domain's SPF configuration.

SPF, DKIM, and DMARC Explained

Understand how SPF, DKIM, and DMARC work together to authenticate email, prevent spoofing, and improve deliverability. A practical guide for non-technical readers.

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.

SPF for Google Workspace: The Complete Setup Guide

Learn how to configure SPF for Google Workspace with the correct include statement. Covers adding Google to existing SPF records, common mistakes, and verification.

SPF for Mailchimp: Email Authentication Setup Guide

Learn how to configure SPF for Mailchimp campaigns. Covers custom domain authentication, SPF includes, and verifying your Mailchimp email setup.

SPF for SendGrid: Setup Guide and Best Practices

Learn how to configure SPF for SendGrid with the correct include statement. Covers adding SendGrid to existing SPF records, domain authentication, and verification.

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.