{"uid":"cap_ofVOiQOhx8DFYtZOZ1xmJ","slug":"dns-cname-lookup-for-smtp-subdomain-1c9e142d","name":"DNS CNAME Lookup for smtp Subdomain","description":"CNAME record of smtp.<domain>: looks up the smtp host under the domain you give (CNAME via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like smtp without enumerating subdomains. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/host/smtp/cname?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"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_3S6XEKgMmRn4-VPuCEis0","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":"Looks up the CNAME record for the smtp.<domain> subdomain using Cloudflare DNS-over-HTTPS and returns whether it exists, its records, and TTL.","exampleAgentPrompt":"Can you check if smtp.example.com has a CNAME record — I want to know what it resolves to and whether it actually exists?","exampleUseCases":[{"title":"Verify email relay CNAME config","prompt":"Check if smtp.mycompany.com has a CNAME record set up — I need to know what host it points to and whether it's properly configured."},{"title":"Audit third-party ESP subdomain","prompt":"Look up the CNAME for smtp.acmecorp.com — I'm auditing their email infrastructure and want to see if they're routing through a third-party mail provider."},{"title":"Detect smtp subdomain before outreach","prompt":"Before I try connecting to smtp.startupxyz.io, can you check if there's a CNAME record there and what it resolves to?"}],"resultDescription":"Returns whether the smtp.<domain> CNAME record exists, the resolved CNAME target(s), the TTL value, and the DNS response code (e.g. NOERROR or NXDOMAIN) as answered by Cloudflare DNS-over-HTTPS.","failureModes":["Domain does not exist — returns NXDOMAIN or no records found","smtp subdomain has no CNAME record (may have A/AAAA instead) — returns empty or missing record","Invalid or malformed domain input — may return error or unexpected result","Cloudflare DoH upstream timeout — lookup may fail or return incomplete response","Rate limiting or payment failure — request rejected before DNS lookup occurs"],"whenToPreferThis":"Use this endpoint when you need a fast, targeted check of whether smtp.<domain> has a CNAME record without performing full subdomain enumeration. Ideal for email infrastructure auditing, pre-connection checks, or validating third-party mail relay delegation. Prefer this over generic DNS resolvers when you specifically need smtp subdomain CNAME data routed through Cloudflare DoH with a simple per-lookup pricing model.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T18:55:51.150Z","isFirstParty":false,"canonicalSlug":"dns-cname-lookup-for-smtp-subdomain-1c9e142d"}