{"uid":"cap_dHTzurke_jFtaacR0NJpR","slug":"preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-168364cc","name":"B2A Email Deliverability, MX, SPF & DMARC Verifier","description":"Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/email-check)","url":"https://preflight.agentdiet.dev/v1/email-check?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["email"],"properties":{"email":{"type":"string","minLength":1,"description":"Email address to validate for syntax, MX deliverability, and disposable risk"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.005","displayCostAsset":"USD","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":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_WHq6Psd8ul1qJAY3WxU24","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"preflight.agentdiet.dev","brandSlug":"preflight-agentdiet-dev-mpp","brandBaseUrl":"https://preflight.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX/SPF/DMARC record checks to assess deliverability.","exampleAgentPrompt":"Can you check if john.doe@acmecorp.com is a real, deliverable email address — verify its syntax, check whether it's from a disposable provider, and confirm there are valid MX, SPF, and DMARC records on the domain?","exampleUseCases":[{"title":"Pre-signup email quality gate","prompt":"Before I allow this user to create an account with the email address signup42@mailnull.com, can you check whether it's from a disposable provider, verify the syntax is correct, and confirm the domain has live MX records so I know it's actually reachable?"},{"title":"B2B lead list hygiene check","prompt":"I'm about to send an outreach email to a prospect at contact@startupxyz.io — can you verify that address is deliverable, not a role account, and that the domain has proper SPF and DMARC records set up?"},{"title":"Marketing list deliverability audit","prompt":"We're cleaning our email list and I need to check whether newsletter@oldcompany.org is still deliverable — run a full DNS check including MX, SPF, and DMARC records and tell me if it looks like a real, functioning mailbox or if we should remove it."}],"resultDescription":"Returns a structured object indicating email syntax validity, whether the domain belongs to a known disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), and the live DNS lookup results for MX, SPF, and DMARC records — allowing the caller to assess overall email deliverability and quality risk.","failureModes":["Empty or missing email field returns a 400 validation error","Malformed email that fails syntax check returns invalid syntax flag rather than performing DNS lookups","DNS lookup timeouts for obscure or slow-responding domains may return incomplete MX/SPF/DMARC data","Newly registered domains may not yet have propagated DNS records, leading to false negatives","Disposable provider list may not cover every burner domain, allowing some to pass undetected","Payment failure or insufficient balance returns HTTP 402 before any validation is performed"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, multi-layer email validation that goes beyond simple syntax checking — combining disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC lookups in a single call. Ideal for agent-driven onboarding flows, B2B lead enrichment pipelines, or pre-send deliverability checks where bad email quality would waste resources or damage sender reputation. Prefer this over basic regex validators or single-purpose DNS tools when you want a single authoritative pass/fail signal with full diagnostic detail.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:32:44.446Z","isFirstParty":false,"canonicalSlug":"preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-2fe18696"}