# Mailboxlayer

**Canonical:** https://apis.io/providers/mailboxlayer/  
**Website:** https://mailboxlayer.com  
**APIs profiled:** 2

Real-time email validation and verification REST/JSON API operated by APILayer. Provides syntax checks, typo suggestions, MX-record lookup, SMTP verification, catch-all/role/disposable/free-provider detection, and a deliverability quality score.

## Kin Score — 74.5 / 100 (exemplar)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 74.5).

| Facet | Score |
|---|---|
| Discoverability | 94.4 |
| Contract Quality | 71.3 |
| Governance | 55.3 |
| Contract Governance | 55.3 |
| Operational Transparency | 50.0 |
| Developer Ergonomics | 86.3 |
| Commercial Clarity | 84.2 |
| Access Clarity | 84.2 |

## Agent readiness — 51.3 (agent-native)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | na |
| Error Semantics | documented |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (2)

- **mailboxlayer Verification API** — Email address validation and verification operations.
- **Mailboxlayer Email Validation API** — REST/JSON API for real-time email validation: syntax check, typo suggestions, MX-record lookup, SMTP verification, catch-all/role/disposable/free detection, and quality score. A...

## Agentic access (1)

- **Mailboxlayer Agentic Access** — 1 operation

## Security (2)

- **Mailboxlayer Authentication** — apiKey · 2 schemes
- **Mailboxlayer Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Mailboxlayer Plans Pricing**

## Use cases (6)

- **Signup Form Validation** — Catch typos and disposable addresses at signup before they hit your user database.
- **List Hygiene** — Clean existing email marketing lists to lift deliverability and sender reputation.
- **Lead Enrichment** — Enrich CRM and lead-capture records with deliverability scores and role flags.
- **Fraud And Abuse Prevention** — Block disposable email providers commonly used for trial abuse and chargebacks.
- **Transactional Email Hygiene** — Reduce hard-bounces from order receipts, password resets, and notifications.
- **B2B Sales Qualification** — Separate role addresses and free-provider addresses from individual corporate inboxes.

## Tags

Email, Email Verification, Email Validation, SMTP, MX Records, Catch-All Detection, Disposable Email, Free Email Provider, Role Address, Quality Score, APILayer, Public APIs, Data Quality, Anti-Fraud, Deliverability, Communications, Developer Tools, Security

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/mailboxlayer/). Scores are computed from the provider's own public artifacts under a published rubric.