DNS Doctor
SPF tool

SPF lookup counter

An SPF record may trigger at most 10 DNS lookups (RFC 7208 §4.6.4). Each include, a, mx, ptr, exists, and redirect= costs one — nested includes count recursively. Go over and receivers return PermError, which fails your SPF silently. Paste a record for a direct count, or a domain for the full recursive total.

Mode: domain lookup
Diagnose your domain

Check SPF, DMARC, DKIM, MX, DNS and expiry in one free scan — with the exact record to paste in to fix each problem.