{"uid":"cap_Sl6O_bnFShV88eyPqWQj1","slug":"srv-submissions-tcp-dns-lookup-00aef39a","name":"SRV Submissions-TCP DNS Lookup","description":"SUBMISSIONS service discovery (_submissions._tcp.<domain>): SRV records with priority, weight, port and target host, from Cloudflare DoH. Tells a client where the domain's submissions service lives without guessing hosts. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/srv/submissions-tcp?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_F5n2SAPYer6McI1yp-oq2","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":"Returns SRV DNS records for the _submissions._tcp service of a domain, revealing the priority, weight, port, and target host for the email submissions service.","exampleAgentPrompt":"Can you look up the _submissions._tcp SRV records for example.com to find out which server and port handle its email submission service?","exampleUseCases":[{"title":"Discover email submission server for domain","prompt":"Look up the SRV submissions-tcp DNS records for acmecorp.com — I need to know the hostname and port their mail submission service is running on."},{"title":"Verify mail submission infrastructure before migration","prompt":"Before we migrate our email setup, can you check the _submissions._tcp SRV records for ourcompany.io to confirm the priority, weight, port, and target host currently configured?"},{"title":"Audit third-party domain submission settings","prompt":"I need to audit where partnerorg.net routes its email submissions — can you pull the SRV records for their _submissions._tcp service and tell me the target host and port?"}],"resultDescription":"A set of SRV DNS records for _submissions._tcp.<domain>, each containing priority (numeric precedence), weight (load balancing factor), port (TCP port the service listens on), and target (FQDN of the host providing the submissions service). Returns an empty or NXDOMAIN-equivalent result if no such record exists.","failureModes":["Domain does not exist or has no _submissions._tcp SRV record — returns empty result or NXDOMAIN","Malformed domain name input causes query failure","Cloudflare DoH upstream timeout or rate limit returns an error","Domain specified without required 'input' wrapper causes schema validation failure"],"whenToPreferThis":"Use this endpoint when you need to programmatically discover the email submission service endpoint (host, port, priority, weight) for a domain using standard SRV DNS records, without manually guessing hostnames or ports. Prefer this over generic DNS A/CNAME lookups when you specifically need service-level routing metadata for SMTP submission (port 587/465 discovery). Ideal for email infrastructure auditing, client configuration automation, or multi-domain delivery orchestration.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:46:05.788Z","isFirstParty":false,"canonicalSlug":"srv-submissions-tcp-dns-lookup-00aef39a"}