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Full email infrastructure health check — MX, SPF, DKIM, DMARC, BIMI, MTA-STS, TLS-RPT plus real-time DNSBL checks of your mail server IPs against 13 IP blacklists (Spamhaus, Barracuda, SORBS, CBL, SpamCop, PSBL, SpamEatingMonkey, UCEPROTECT, Hostkarma, SPFBL) and the domain against 6 domain blacklists (Spamhaus DBL, URIBL, SURBL, Invaluement). No API key required.