{"uid":"cap_wbCAtD_i6XFesKJNVLHh2","slug":"is-port-587-open-6d47d897","name":"is-port-587-open","description":"Is TCP port 587 (Submission) open on a host? Attempts a connection from Cloudflare's edge and reports open/closed/filtered with the connect time; Cloudflare-fronted hosts are reported as inconclusive because their edge answers for them. Exposure checks for Submission without running a scanner. $0.01 per check.","url":"https://ip.intel.rallylive.ca/ip/port/587?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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_pT_-Y4fwRaL9Ws9apnD2J","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":"Checks whether TCP port 587 (SMTP Submission) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.","exampleAgentPrompt":"Can you check whether TCP port 587 (SMTP Submission) is open or closed on mail.example.com — I want to know if it's reachable from the outside without running a local scanner.","exampleUseCases":[{"title":"Mail server delivery configuration audit","prompt":"I'm setting up a new mail server at smtp.mycompany.com — can you check if port 587 is open and reachable so I can confirm the submission port is correctly exposed before I point MX records at it?"},{"title":"Security exposure check for email port","prompt":"We've had a misconfiguration incident before — can you probe port 587 on 203.0.113.45 and tell me if it's open, closed, or filtered? I want to know if SMTP submission is accidentally exposed."},{"title":"Third-party mail relay reachability test","prompt":"I'm troubleshooting email delivery issues through our relay at relay.partnerco.io — can you check from the outside whether port 587 is reachable on that host, and how fast the connection responds?"}],"resultDescription":"Returns whether TCP port 587 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is Cloudflare-fronted, the result is reported as inconclusive because Cloudflare's edge answers the connection rather than the origin server.","failureModes":["Host is Cloudflare-fronted: result returned as inconclusive because Cloudflare's edge terminates the TCP connection","Invalid or unresolvable hostname: likely returns an error or filtered status","Network timeout on heavily firewalled hosts: may report filtered rather than closed","Rate limiting or payment failure: call not executed if USDC payment of $0.01 is not settled"],"whenToPreferThis":"Use this endpoint when you need a quick, external probe of TCP port 587 on a specific host without running your own port scanner or network tooling. It is especially useful for email infrastructure validation, security audits of SMTP Submission exposure, and monitoring whether a mail relay is reachable — all from a neutral Cloudflare-edge vantage point. Prefer it over generic port scanners when you want a lightweight, pay-per-check approach with no setup required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:48.463Z","isFirstParty":false,"canonicalSlug":"is-port-587-open-6d47d897"}