{"uid":"cap_SnjsZ0tW2V9gOAkhvBE09","slug":"dkim-smtp-selector-lookup-7894e41d","name":"DKIM SMTP Selector Lookup","description":"DKIM public key for selector \"smtp\" of a domain: looks up smtp._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confirms that mail signed with the smtp selector will verify. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/dkim/smtp?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_UI40uR5_NNCEJCSChg6kR","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 and parses the DKIM public key for the 'smtp' selector of a given domain, returning key type, length, testing flag, and revocation status.","exampleAgentPrompt":"Can you check if the DKIM smtp selector is properly configured for example.com — I want to know the key type, key length, whether it's in testing mode, and if the key has been revoked?","exampleUseCases":[{"title":"Pre-send email deliverability audit","prompt":"Before we start sending marketing emails through our smtp server, can you verify that the smtp DKIM selector for acme-corp.com is set up correctly and the key hasn't been revoked?"},{"title":"Security check for DKIM key strength","prompt":"Check the smtp DKIM selector for bigbank.io and tell me how long the public key is — I want to make sure we're not using a weak key that could be compromised."},{"title":"Diagnosing email authentication failures","prompt":"Our emails from newsletter.startupxyz.com are failing DKIM verification — can you look up the smtp._domainkey TXT record and tell me if the key is revoked or in testing mode?"}],"resultDescription":"Returns parsed details of the smtp._domainkey.<domain> TXT record including the DKIM version (v=), key type (k=), public key, key length in bits, whether the testing flag is set, and whether the key is revoked (empty p= field). Also indicates if mail signed with the smtp selector will successfully verify.","failureModes":["Domain does not have an smtp DKIM selector configured — returns no record found","DNS lookup fails due to upstream Cloudflare DoH unavailability","Domain is invalid or does not exist — returns DNS error","Key is present but malformed — parsing errors returned","Network timeout on DoH query"],"whenToPreferThis":"Use this endpoint when you specifically need to inspect the 'smtp' DKIM selector for a domain. Prefer this over generic DNS TXT lookups when you need structured DKIM field parsing (key type, length, revocation status, testing flag) rather than raw TXT data. Use when troubleshooting email authentication issues or auditing DKIM configuration for the smtp mail sending selector specifically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:38.685Z","isFirstParty":false,"canonicalSlug":"dkim-smtp-selector-lookup-7894e41d"}