{"uid":"cap_fJ6o7-2E86JbBrwZsECmL","slug":"is-email-hosted-by-posteo-bulk-7de4333f","name":"is-email-hosted-by-posteo-bulk","description":"Bulk is email hosted by posteo: up to 20 domains in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.","url":"https://email.intel.rallylive.ca/bulk/email/hosted-by/posteo?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xL90WTHNyJGjYyxQeQXTl","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether up to 20 domains have their email hosted by Posteo in a single concurrent batch call, returning a per-item boolean result and error field.","exampleAgentPrompt":"Can you check which of these domains use Posteo as their email host? Here's my list: proton.me, tutanota.com, posteo.de, fastmail.com, hey.com, gmail.com, zoho.com, mailbox.org, startmail.com, runbox.com — run them all at once and tell me which ones are on Posteo.","exampleUseCases":[{"title":"Competitive email stack research","prompt":"I have a list of 15 privacy-focused SaaS companies and I want to know which of them host their email on Posteo — can you check all of them in one go?"},{"title":"Lead enrichment for email tool targeting","prompt":"Before we reach out to these prospects, can you tell me which of the 18 domains on this list are using Posteo for their email hosting? I want to filter our outreach accordingly."},{"title":"Compliance audit of vendor email infrastructure","prompt":"We're auditing our vendor list and need to flag any that rely on Posteo for email. Can you run all 20 vendor domains through a Posteo hosting check and give me the pass/fail results with any errors noted?"}],"resultDescription":"An ordered array of results corresponding to the input domains, each containing a boolean indicating whether the domain's email is hosted by Posteo, a per-item error field if the lookup failed, and an overall failure count for the batch.","failureModes":["Domain DNS lookup fails for one or more items — per-item error field is populated and failure count incremented","Input exceeds 20 domains — request may be rejected or truncated","Invalid domain format — per-item error returned","DNS timeout from Cloudflare DoH — per-item error with no result","Empty domain list — error or empty result array"],"whenToPreferThis":"Use this endpoint when you have 2–20 domains and need to check Posteo email hosting status concurrently in a single call rather than making repeated single-domain requests. Ideal for lead enrichment pipelines, competitive research, or compliance audits where batch throughput matters and cost per call ($0.10 for up to 20 items) is preferred over per-item pricing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T18:38:04.764Z","isFirstParty":false,"canonicalSlug":"is-email-hosted-by-posteo-bulk-7de4333f"}