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SPF Policy Tree
Recursively expands every include and redirect in a domain's SPF record, counts DNS lookups against the RFC 7208 limit of 10, and flags void lookups. The single most common cause of silent SPF failure is blowing past 10 lookups.
All lookups run read-only through Cloudflare's public resolver. Lookup counting follows RFC 7208: include, a, mx, ptr, exists, and redirect each cost one query; the ip4/ip6/all mechanisms are free.