Resources
Headers, DNS, delivery and measurement in the order they happen.
Use the same deterministic engine when an inbound test is unavailable.
Inspect what a sending domain publishes, separate from a real campaign.
Published Gmail, Yahoo, Microsoft and Apple requirements.
Dated changes from Klaviyo, Mailchimp and Braze.
A live census that distinguishes a listing from a refused lookup.
Receive and read aggregate reports without turning them into a score.
A shareable operational view of the rules in your setup.
A live authentication badge for a domain.
Machine-readable access to the public rule corpus.
Browse rules by the places in which they apply.