Email authentication, without the RFC-speak

Understand it once.
Configure it with confidence.

Practical explanations for the records that decide whether your messages earn trust, reach the inbox, or get rejected.

Start with the fundamentals

Four standards, four distinct jobs. Learn how they work together before changing DNS.

SPF

Understand includes, IP mechanisms, and why the 10-lookup limit matters.

See how selectors and cryptographic signatures establish authenticity.

Connect SPF and DKIM to visible From addresses and choose a policy.

Learn what inbox logos require beyond publishing one more DNS record.

Detailed playbooks for the places where real-world email configurations get complicated.

Rollout plan

Move from monitoring to rejection without interrupting legitimate senders.

See how providers consume lookups and what to do before SPF fails.

Reference

Find common selectors for major email service providers.

Compliance

Understand the authentication baseline for high-volume Gmail delivery.

Audit all five authentication signals together and see exactly where to focus.