SPF Checker · free
SPF record checker
Look up your SPF record, inspect included records, and review the tool’s DNS lookup count.
The 10-lookup rule
SPF records resolve recursively. Every include:, a, mx, redirect, and a few other mechanisms count toward a per-evaluation lookup budget of 10. Exceed 10 and receivers treat the SPF as permerror: an SPF evaluation error.
Inspect SPF dependencies and identify potential lookup-limit problems. For a deeper explanation of how SPF fits with DKIM and DMARC, read our 2026 authentication setup guide.
Need this in production?
The free tool is great for one-off checks. For automated monitoring, alerting, and an API, see the related Postscale product.
See the Transactional Email API