{"uid":"cap_8g2utyWdVxbzAZ0vpI_V3","slug":"preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9a87a22e","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/mx-deliverability-verifier)","url":"https://preflight.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz","method":"GET","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_8Loyn07AtSKv83duxhbj6","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, and DMARC record presence.","exampleAgentPrompt":"Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it passes syntax checks, isn't from a disposable provider, and has valid MX, SPF, and DMARC DNS records set up?","exampleUseCases":[{"title":"Scrub leads before email outreach","prompt":"Before I launch this cold email campaign, can you verify that michael.torres@acmecorp.io is a legitimate deliverable address — check syntax, MX records, and whether it's a role account or disposable email?"},{"title":"Block burner emails at signup","prompt":"A user just tried to sign up with temp-mail123@guerrillamail.com — can you check if that's a disposable or burner email address so I can decide whether to block the registration?"},{"title":"Audit domain email security posture","prompt":"Check the email address postmaster@startupxyz.com and tell me whether their domain has SPF and DMARC records properly configured — I want to know if they have basic email security in place."}],"resultDescription":"Returns a structured object indicating email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records — giving an overall deliverability assessment.","failureModes":["Missing or invalid 'email' query parameter returns a 400 error","DNS lookup timeout if the target domain's nameservers are slow or unresponsive","False negatives on newly created disposable domains not yet in blocklists","Payment required (HTTP 402) if x402 USDC micropayment is not included","Role-account detection limited to well-known prefixes; custom role aliases may be missed"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, single-call email health check that combines syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC record verification — especially in agent workflows requiring fraud prevention, lead quality scoring, or pre-send deliverability checks. Prefer it over simple regex validators when real DNS state matters, and over heavyweight email verification services when lightweight per-call micropayment pricing ($0.005) fits your cost model.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:20:38.455Z","isFirstParty":false,"canonicalSlug":"preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-2fe18696"}