---
title: "Spoof check"
full: true
_openapi:
  method: POST
  toc: []
  structuredData:
    headings: []
    contents:
      - content: "Answers whether attackers can forge email from your domain without permission. Analyzes DMARC enforcement policies, SPF '+all' loopholes, and subdomain vulnerabilities."
_apiData:
  document: "https://reloop.sh/api/tools/openapi/json"
  operationData: [{"path":"/api/tools/v1/spoof-checker","method":"post"}]
  parameterList: [{"name":"domain","type":"string","required":true,"description":"The sending domain name or URL to check spoofability for.","location":"body","minLength":1,"maxLength":255,"example":"stripe.com"}]
  responseMap: {"200":{"description":"Response for status 200","schema":{"domain":"send.example.com","resolvedAt":"2026-03-23T10:00:00.000Z","responseTimeMs":0,"spoofable":true,"verdict":"spoofable","headline":"example_headline","summary":"example_summary","inboxOutcome":"delivered","dmarc":{"published":true,"policy":"example_policy","subdomainPolicy":"example_subdomainPolicy","percentage":0,"rawRecord":"example_rawRecord"},"spf":{"published":true,"qualifier":"example_qualifier","lookupCount":0,"rawRecord":"example_rawRecord"},"dkim":{"published":true,"selector":"example_selector","keyLength":0},"mx":{"published":true,"provider":"example_provider"},"reasons":[{"id":"con_123456789","severity":"critical","title":"example_title","detail":"example_detail"}],"nextStep":{"title":"example_title","body":"example_body","href":"example_href"},"subdomainNote":"example_subdomainNote"}},"400":{"description":"Response for status 400","schema":{"message":"Contact already exists","why":"A contact with this email already exists in your organization.","fix":"Use a different email address or update the existing contact instead.","link":"https://reloop.sh/docs/api/contacts"}},"429":{"description":"Response for status 429","schema":{"message":"Contact already exists","why":"A contact with this email already exists in your organization.","fix":"Use a different email address or update the existing contact instead.","link":"https://reloop.sh/docs/api/contacts"}},"500":{"description":"Response for status 500","schema":{"message":"Contact already exists","why":"A contact with this email already exists in your organization.","fix":"Use a different email address or update the existing contact instead.","link":"https://reloop.sh/docs/api/contacts"}}}
  codeSamples: []
---
> For the complete documentation index, see [llms-docs.txt](/llms-docs.txt) or the site index [llms.txt](/llms.txt). Full docs corpus: [llms-full-docs.txt](/llms-full-docs.txt). Prefer markdown URLs (append `.md`) for agent consumption. Product skill: [skill.md](/skill.md).


{/* This file was generated by the OpenAPI doc generator. Do not edit this file directly. Run `bun run generate:api-docs` to regenerate. */}

<APIPage />