Return Path
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 "Return Path" product line; 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. Return Path exposes no publicly documented developer API, SDK, or developer portal today; its capabilities are delivered through the Validity email-success platform.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Return Path the way a machine reads it — 3 machine-readable artifacts, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Return Path scores 14.7/100 (minimal), with a separate agent-readiness read of 4/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Return Path
Each block below is one kind of artifact we hold for Return Path. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Return Path Trust Center
SOC 2 Type 2, ISO/IEC 27001, ISO/IEC 27701, GDPR, CCPA, EU-US Data Privacy Framework, Microsoft SSPA, Standard Contractual Clauses
SECURITYResources
Every other property we hold for Return Path — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Access & Security 8
Authentication, authorization, and security posture
Scroll within the panel for all 8 ·
Operate 3
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/return-path · machine-readable index on apis.io