Launching today
CourseSignal Email Auth Checker
Free email authentication checker (SPF, DKIM, DMARC)
2 followers
Free email authentication checker (SPF, DKIM, DMARC)
2 followers
Free email authentication checker for course and coaching domains. Test SPF, DKIM, DMARC and MX in your browser. Nothing is stored. A free, client-side email authentication checker for course creators and coaches. Check public SPF, DKIM, DMARC and MX records, get plain-English explanations, and investigate common setup issues before your next broadcast. No sign-up or email address required.
Free
Launch tags:Website Builder
Launch Team
Framer AI AgentsDesign and publish professional sites with AI
Promoted
Hi Product Hunt — I'm Ben from Urban Huntsman Ltd, the publisher of CourseSignal.
Course email troubleshooting often starts with four unfamiliar acronyms. This free checker puts SPF, DKIM, DMARC and MX lookups together with plain-English explanations, so course creators and coaches have a starting point for the next question to ask their sending provider.
It runs client-side, with public DNS queries sent directly to Cloudflare. No sign-up, and CourseSignal stores none of your entered domains or results. That's not a claim that no third party sees the query: Cloudflare is the resolver.
A couple of limits matter: a DKIM key search needs the right selector, and DNS records alone cannot tell you where a campaign will land. For the rest of the process, the free guide is coursesignal.io/check-email-goes-to-spam .