About EmailAuthKit
Why EmailAuthKit exists
Email authentication combines standards, DNS records and provider-specific controls. EmailAuthKit turns that work into bounded generators, checks and deployment sequences while keeping entered material in the browser.
Editorial method
Guidance is based on current provider documentation and Internet standards. We distinguish syntax checks from live DNS checks and never claim that authentication guarantees delivery. Content and examples were reviewed on 4 September 2026.
Operator
EmailAuthKit is operated by Acerville Sparks Limited. It is independent of Google, Microsoft and other email providers.
Authoritative references
Read the underlying standards and provider instructions before changing production DNS: RFC 7208 (SPF), RFC 9989 (DMARC), Google Workspace SPF guidance and your sending provider's current DKIM documentation.
How material is produced
Each page begins with a bounded user task, distinguishes syntax from live verification, links to the relevant standard or provider instructions and states what the result cannot prove. Browser tools have automated normal and failure examples; public routes are exercised on desktop and mobile.
Who, how and why
Acerville Sparks Limited publishes EmailAuthKit to make authentication changes easier to inspect and reverse. Software assists drafting and testing, while visible sources, review dates, worked checks and limitations allow readers to verify the guidance.
Commercial independence
The site does not currently sell placement in its recommendations or promise delivery outcomes. Any future advertising or referral relationship must be labelled and cannot alter standards-based conclusions.
Editorial responsibility
Published by Acerville Sparks Limited. Software assists research, drafting and automated record testing. Internet standards, provider documentation, reproducible checks and limitations are shown so readers can inspect the work. No independent deliverability consultant review is claimed. Reviewed 4 September 2026.
What this site does not do
No inbox guarantee. No live DNS checks. No storage of entered data. No passwords or private keys requested.