About

SPFcheck.io keeps SPF lookups simple.

SPFcheck.io is my way of helping fellow engineers, domain owners, and support teams check and troubleshoot email platforms.

When you enter a domain, the site sends it to an AWS Lambda function through API Gateway. The function performs a DNS TXT lookup and returns the SPF result to your browser.

No DNS processing is performed client-side. The browser only submits the domain and renders the result.

Want to know what any of this means? Read a short guide to SPF, or run a lookup.