{"uid":"cap_OnfmFNjsAJFRQN-YF6gUj","slug":"lookproof-dmarc-spoofability-check-1e9198b5","name":"Lookproof DMARC Spoofability Check","description":"Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.","url":"https://api.lookproof.dev/v1/mail/spoofable?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","title":"DomainInput","required":["domain"],"properties":{"domain":{"type":"string","title":"Domain","examples":["example.com"],"maxLength":1024,"minLength":1}},"additionalProperties":false}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_gsD5MqDnJHCSTQQ4qnBDJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns how strongly a domain's DMARC policy asks receivers to act on mail that fails authentication, including effective policy, subdomain policy, pct, SPF all-qualifier, and plaintext gap explanations.","exampleAgentPrompt":"Can this domain be spoofed — check paypal.com's DMARC policy and tell me whether receivers are actually being asked to reject or quarantine forged mail, or if it's just monitoring?","exampleUseCases":[{"title":"Phishing risk assessment for vendor domain","prompt":"I'm about to onboard acmecorp.com as a vendor — can you check if their DMARC policy would stop someone from sending fake emails pretending to be from them, or are they still in monitor-only mode?"},{"title":"Security audit email spoofability report","prompt":"Run a DMARC spoofability check on all our partner domains starting with partnerco.com — tell me the effective policy, the pct, and any gaps in plain English so I can flag the risky ones."},{"title":"Investigating a phishing email source domain","prompt":"We got a suspicious email claiming to be from notifications@brandxyz.com — can you check if brandxyz.com has a DMARC policy that should have blocked it, or is there a gap that let it through?"}],"resultDescription":"A structured response showing the domain's DMARC policy level (none/quarantine/reject), effective policy after accounting for test mode (t=y), the subdomain policy (sp=), the pct value indicating what fraction of failing mail is subject to the policy, the SPF all-qualifier, and a plain-language explanation of any gaps that leave the domain spoofable.","failureModes":["Domain has no DMARC record — returns none policy or an explicit 'no record' indicator","Malformed or multiple DMARC records — may return an error or best-effort parse","Domain does not exist in DNS — returns error or empty response","Network/DNS resolution timeout — returns transient error","Invalid domain input (too long, wrong format) — rejected by schema validation"],"whenToPreferThis":"Use this endpoint when you need a focused, plain-language assessment of a domain's DMARC enforcement posture specifically — whether receivers are actually asked to reject or quarantine spoofed mail, and what gaps exist. Prefer it over a full mail-security report when you only need the spoofability verdict quickly and cheaply, or when explaining DMARC policy to a non-technical user.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:52.760Z","isFirstParty":false,"canonicalSlug":"lookproof-dmarc-spoofability-check-1e9198b5"}