{"uid":"cap_IGAMwJE8gFsc_wC4Zfnju","slug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-919409f1","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://prompt-guard.agentdiet.dev/v1/mx-deliverability-verifier)","url":"https://prompt-guard.agentdiet.dev/v1/mx-deliverability-verifier?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_x_5z_KzrfuDdH9WmHPwef","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"prompt-guard.agentdiet.dev","brandSlug":"prompt-guard-agentdiet-dev-mpp","brandBaseUrl":"https://prompt-guard.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 whether john.doe@acmecorp.com is a real, deliverable email — specifically whether it passes syntax checks, isn't a disposable/burner address, and has valid MX, SPF, and DMARC records set up on the domain?","exampleUseCases":[{"title":"Screening signups for fake emails","prompt":"Before I add this new user to my database, can you verify that their signup email fake123@mailinator.com is legit — check if it's disposable, if the domain has working MX records, and whether SPF and DMARC are configured?"},{"title":"B2B lead list email hygiene","prompt":"I have a prospect email contact@bigclient.io — can you verify it's deliverable by checking the syntax, MX records, and whether the domain has SPF and DMARC set up, and flag it if it looks like a role or noreply account?"},{"title":"Pre-send deliverability audit","prompt":"I'm about to send an outreach email to ceo@targetstartup.com — can you run a full deliverability check on that address, including live MX lookup, SPF and DMARC DNS records, and whether it's a role account or burner domain?"}],"resultDescription":"Returns a structured object indicating email syntax validity, whether the domain is a known disposable/burner provider, whether the address is a role account (e.g. admin@, info@), and live DNS lookup results for MX records (mail servers), SPF policy, and DMARC policy — giving a comprehensive picture of whether the email is safe and likely deliverable.","failureModes":["Invalid or malformed email input returns a syntax error","Domain does not exist or has no DNS records, resulting in MX lookup failure","Transient DNS resolution timeouts for live record checks","Disposable provider database may not cover all emerging throwaway services","Payment failure via x402 if USDC balance is insufficient"],"whenToPreferThis":"Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable provider detection and role account flagging in a single call. It is especially suited for B2B lead enrichment pipelines, user signup screening, or pre-send deliverability audits where a lightweight regex check is insufficient.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T06:34:24.348Z","isFirstParty":false,"canonicalSlug":"prompt-guard-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f0765224"}