Return Path

aid: return-path
accessModel:
  pricing: enterprise
  onboarding: approval
  trial: false
  try_now: false
  public: false
  label: Enterprise, contact sales
  confidence: medium
  source:
  - https://www.validity.com/pricing/
  - https://developer.everest.validity.com/
  generated: '2026-08-13'
  method: searched
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/return-path.png
name: Return Path
description: Return Path is an email-deliverability and inbox-intelligence brand that pioneered sender reputation, inbox-placement
  monitoring, and email fraud protection for marketers and email senders. Founded in 1999 and backed by Sapphire Ventures
  and Union Square Ventures, Return Path was acquired by Validity in 2019 and now ships as the Validity Everest email-success
  platform; returnpath.com 301-redirects to validity.com. The platform draws on signals from billions of global mailboxes
  to measure inbox placement, sender reputation, and deliverability across major mailbox providers. The Return Path product
  line's surviving API surface is the Everest API at api.everest.validity.com — 170 published operations across inbox placement,
  sender reputation and Sender Score, blocklist and spam-trap monitoring, DMARC infrastructure reporting, engagement analytics,
  list validation and certification. Validity publishes no OpenAPI, but it does publish a complete public Postman collection
  at developer.everest.validity.com, which is the machine-readable contract this profile is built from.
url: https://raw.githubusercontent.com/api-evangelist/return-path/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- sapphire-ventures
- union-square-ventures
x-tier: profiled
x-tier-reason: published-api-surface
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- Company
- Martech
- Email
- Email Deliverability
- Email Marketing
- Sender Reputation
- Inbox Placement
- Deliverability
- DMARC
- Email Authentication
- Email Validation
- Analytics
apis:
- name: Everest API
  description: 'The Everest API by Validity — the Return Path platform''s surviving programmable surface. Two live major versions
    behind one host: /api/2.0 is current and covers inbox placement testing and seed lists, sender reputation profiles, Sender
    Score, blocklist listings, spam-trap events, DMARC infrastructure reporting, engagement and delivery analytics, list validation,
    View Time Optimization and certification performance; /api/1.0 is the legacy surface that still carries Account Services
    (aliases, child accounts, API keys, GDPR requests, webhook endpoints). Authenticated with a static X-API-KEY header, limited
    to 500 requests per minute per account.'
  humanURL: https://developer.everest.validity.com/
  baseURL: https://api.everest.validity.com/api
  tags:
  - Email Deliverability
  - Inbox Placement
  - Sender Reputation
  - DMARC
  - Email Validation
  properties:
  - type: OpenAPI
    name: Everest API (derived from the published Postman collection)
    url: openapi/return-path-everest-api-openapi.yml
  - type: Postman
    name: Everest API public Postman collection (provider-published)
    url: collections/return-path-everest-api.postman_collection.json
  - type: Overlay
    url: overlays/return-path-everest-api-overlay.yaml
  - type: Documentation
    url: https://developer.everest.validity.com/
  - type: APIReference
    url: https://developer.everest.validity.com/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.returnpath.com/
- type: Product
  url: https://www.validity.com/capabilities/engage-inbox-placement-and-deliverability/
- type: Blog
  url: https://www.validity.com/blog/
- type: Support
  url: https://knowledge.validity.com/hc/en-us
- type: HelpCenter
  url: https://knowledge.validity.com/hc/en-us
- type: Community
  url: https://mycommunity.validity.com/
- type: PrivacyPolicy
  url: https://www.validity.com/privacy-policy/
- type: TermsOfService
  url: https://www.validity.com/legal/terms-of-service/
- type: DeveloperPortal
  name: Everest API developer portal
  url: https://developer.everest.validity.com/
- type: Documentation
  url: https://developer.everest.validity.com/
- type: APIReference
  url: https://developer.everest.validity.com/
- type: Postman
  name: Everest by Validity public Postman workspace
  url: https://www.postman.com/two50okay/workspace/everest-by-validity-s-public-workspace/overview
- type: Login
  name: Everest sign in
  url: https://everest.validity.com/login
- type: TrustCenter
  url: https://trust.validity.com/
- type: Compliance
  url: https://trust.validity.com/
- type: Security
  url: https://trust.validity.com/
- type: TrustCenter
  name: Trust Center (artifact)
  url: security/return-path-trust-center.yml
- type: Compliance
  name: Published compliance program (SOC 2, ISO 27001/27701)
  url: security/return-path-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/return-path-vulnerability-disclosure.yml
- type: Security
  name: Security contact / disclosure
  url: security/return-path-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/return-path-domain-security.yml
- type: Authentication
  url: authentication/return-path-authentication.yml
- type: Conventions
  url: conventions/return-path-conventions.yml
- type: ErrorCatalog
  url: errors/return-path-problem-types.yml
- type: RateLimits
  url: rate-limits/return-path-rate-limits.yml
- type: Plans
  url: plans/return-path-plans-pricing.yml
- type: Lifecycle
  url: lifecycle/return-path-lifecycle.yml
- type: Webhooks
  name: Everest Universal Endpoint webhook surface
  url: asyncapi/return-path-webhooks.yml
- type: DataModel
  url: data-model/return-path-data-model.yml
- type: Conformance
  url: conformance/return-path-conformance.yml
- type: Packages
  url: packages/return-path-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  name: llms.txt served by validity.com, the host that now serves Return Path
  url: llms/return-path-llms.txt
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 16
  pass: local-v1