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Find out why email goes to spam. SPF, DKIM, DMARC and MX audit for any domain, with plain-language fix records. No signup. Google, Yahoo and Microsoft now enforce sender requirements — mail from non-compliant domains is rejected outright (550 5.7.515 "Access denied"). Meanwhile "even invoice emails go to spam" is one of the most expensive problems a small business can have: clients simply never receive you. Deliverability consultants charge $200–600/month, and retained experts up to $6,000/month. Here is the open secret: roughly two thirds of deliverability problems are just broken DNS records — SPF, DKIM, DMARC. Records are right or wrong. Inbox Shield checks them deterministically, in seconds, for any domain. WHAT THE FREE PLAN DOES • Risk score (0–100) with a clear band • Top findings: why mail dies, what each record does • Unlimited domain checks — yours, your clients', your prospects' • PDF report (with Shield branding) WHAT PRO UNLOCKS — $39 ONE-TIME, NO SUBSCRIPTION • All 11 findings: why + found + exact fix • Copy-ready Fix plan: a clean merged SPF, the DMARC ladder tuned to your situation (none → quarantine → reject), DKIM steps for your mail platform • Provider detection — recognizes the platform your mail runs on and tailors the fix steps to it • White-label PDF reports — one per client, your agency's name on it HOW IT WORKS Type a domain. The Shield reads its public DNS records — SPF, DMARC, MX, and DKIM across 24 common selector names — through public DNS-over-HTTPS resolvers. Exactly the information any receiving mail server sees. Then it scores, explains, and hands you the records to paste. DETERMINISTIC, NOT GUESSED DNS records are right or wrong. This is a factual audit of published records — not sending-side testing, not a substitute for monitoring, and no wizardry: just the truth about your domain, in plain words. PRIVATE BY ARCHITECTURE No signup, no analytics, no servers of ours. The domain you type is the only thing queried. Only your license key is verified with our payment processor when you activate Pro. Independent software. Not affiliated with Google, Microsoft or Yahoo.