SPF record checker.
Look up any domain's SPF record, parse every mechanism, count DNS lookups against the RFC 7208 limit of ten, and catch broken or permissive policies before Gmail does.
SPF is the first authentication mailbox providers check. A missing or misconfigured record gets you soft-failed at Gmail and outright-rejected at corporate filters. The RFC 7208 ten-lookup cap is the single most common silent failure — once you cross it, your record returns permerror and every receiver treats SPF as if it didn't exist.
Green: record exists, ends in ~all or -all, under ten lookups. Amber: permissive (+all, ?all) or lookup count nearing the limit. Red: no record, multiple records, or over ten lookups.