{"uid":"cap_7UFNoWXlwp1p_3m5I1cFP","slug":"email-deliverability-checker-925ab723","name":"Email Deliverability Checker","description":"Checks whether a web email address is deliverable and likely valid.","url":"https://relay402.georgespring.workers.dev/api/web-email-deliverability","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["domain"],"properties":{"domain":{"type":"string","pattern":"^[a-z0-9]([a-z0-9.-]{2,251})[a-z0-9]$"}},"additionalProperties":false}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_S2INjqHUyweQeSZJP-z8M","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks a domain's email deliverability posture by inspecting MX, SPF, and DMARC DNS records, returning a risk score, risk level, summary, and DNS evidence.","exampleAgentPrompt":"Can you check the email deliverability posture for mailchimp.com — I want to know if their MX, SPF, and DMARC records are properly set up and what the overall risk score is?","exampleUseCases":[{"title":"Vendor onboarding email security audit","prompt":"Before we start receiving invoices from this new supplier, can you check the email deliverability posture for their domain acmesuppliers.com? I want to make sure their SPF and DMARC records are properly configured and see what the overall risk level looks like."},{"title":"Investigate emails landing in spam","prompt":"Our sales team keeps saying emails from partnerfirm.io are going straight to spam — can you check their email deliverability setup and tell me if there are any issues with their MX, SPF, or DMARC records that might explain why?"},{"title":"Pre-send campaign domain audit","prompt":"We're about to launch a big email campaign from our new domain brandnewsender.com — can you audit its email deliverability posture and let me know if everything looks good with our DNS records before we hit send?"}],"resultDescription":"Returns a risk score (numeric), risk level (e.g. low/medium/high), a human-readable summary of the domain's email deliverability posture, and supporting DNS evidence including MX, SPF, and DMARC record details.","failureModes":["Invalid domain format returns a validation error","Domain with no DNS records may return high risk or missing-record indicators","Non-existent domain returns an error or high-risk result","Network timeout reaching DNS resolvers may cause a failed lookup","Private/internal domains may return incomplete results"],"whenToPreferThis":"Use this endpoint when you need a quick, structured assessment of a domain's email deliverability health — specifically MX, SPF, and DMARC coverage — without needing to set up your own DNS resolver. Ideal for due diligence on new vendor domains, pre-send deliverability audits, or security triage of unknown senders.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T00:45:45.327Z","isFirstParty":false}