Mailtrap

Mailtrap provides a RESTful email infrastructure API with high deliverability rates, an email sandbox for safe testing, and actionable analytics. It offers SDKs for smooth integration and supports both transactional sending and bulk email delivery.

Mailtrap publishes 3 APIs on the APIs.io network: Inboxes API, Messages API, and Send API. Tagged areas include Email, Email Delivery, Email Sandbox, Email Testing, and Transactional Email.

Mailtrap’s developer surface includes authentication, developer portal, documentation, signup flow, pricing, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

37.1/100 thin ▬ flat Agent 20/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumSelf serve⚡ Free to try

3 APIs

Email Email DeliveryEmail SandboxEmail Testing Transactional Email

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 37.1/100 · thin

Contract Quality 13.3 / 25

Developer Ergonomics 6.7 / 20

Access Clarity 6.6 / 20

Operational Transparency 2.4 / 13

Contract Governance 0.0 / 12

Discoverability 8.2 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/mailtrap: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Mailtrap Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

LinkedIn

Blog

Blog

Source (apis.yml)

aid: mailtrap
name: Mailtrap
description: Mailtrap provides a RESTful email infrastructure API with high deliverability rates, an email sandbox for safe
  testing, and actionable analytics. It offers SDKs for smooth integration and supports both transactional sending and bulk
  email delivery.
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mailtrap.png
tags:
- Email
- Email Delivery
- Email Sandbox
- Email Testing
- Transactional Email
url: https://raw.githubusercontent.com/api-evangelist/mailtrap/refs/heads/main/apis.yml
created: '2025-02-06'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: mailtrap:mailtrap-inboxes-api
  name: Mailtrap Inboxes API
  description: Manage sandbox inboxes
  humanURL: https://mailtrap.io/email-api/
  baseURL: https://send.api.mailtrap.io
  tags:
  - Inboxes
  properties:
  - type: OpenAPI
    url: openapi/mailtrap-inboxes-api-openapi.yml
  - type: Documentation
    url: https://docs.mailtrap.io/developers
  - type: Reference
    url: https://api-docs.mailtrap.io/
  - type: GettingStarted
    url: https://docs.mailtrap.io/docs/sending-emails-overview
  - type: Documentation
    url: https://docs.mailtrap.io/docs/email-sandbox-overview
- aid: mailtrap:mailtrap-messages-api
  name: Mailtrap Messages API
  description: Inspect captured messages
  humanURL: https://mailtrap.io/email-api/
  baseURL: https://send.api.mailtrap.io
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/mailtrap-messages-api-openapi.yml
  - type: Documentation
    url: https://docs.mailtrap.io/developers
  - type: Reference
    url: https://api-docs.mailtrap.io/
  - type: GettingStarted
    url: https://docs.mailtrap.io/docs/sending-emails-overview
  - type: Documentation
    url: https://docs.mailtrap.io/docs/email-sandbox-overview
- aid: mailtrap:mailtrap-send-api
  name: Mailtrap Send API
  description: Send transactional and bulk emails
  humanURL: https://mailtrap.io/email-api/
  baseURL: https://send.api.mailtrap.io
  tags:
  - Send
  properties:
  - type: OpenAPI
    url: openapi/mailtrap-send-api-openapi.yml
  - type: Documentation
    url: https://docs.mailtrap.io/developers
  - type: Reference
    url: https://api-docs.mailtrap.io/
  - type: GettingStarted
    url: https://docs.mailtrap.io/docs/sending-emails-overview
  - type: Documentation
    url: https://docs.mailtrap.io/docs/email-sandbox-overview
common:
- type: AgenticAccess
  url: agentic-access/mailtrap-agentic-access.yml
- type: DomainSecurity
  url: security/mailtrap-domain-security.yml
- type: Authentication
  url: authentication/mailtrap-authentication.yml
- type: GitHubOrganization
  url: https://github.com/mailtrap
- type: LinkedIn
  url: https://www.linkedin.com/company/mailtrap
- type: Portal
  url: https://mailtrap.io/
- type: Documentation
  url: https://docs.mailtrap.io/
- type: Signup
  url: https://mailtrap.io/register/signup
- type: Login
  url: https://mailtrap.io/users/sign_in
- type: Pricing
  url: https://mailtrap.io/pricing/
- type: StatusPage
  url: https://status.mailtrap.io/
- type: Support
  url: https://help.mailtrap.io/
- type: TermsOfService
  url: https://mailtrap.io/terms-of-use/
- type: PrivacyPolicy
  url: https://mailtrap.io/privacy-policy/
- type: LlmsText
  url: https://docs.mailtrap.io/llms.txt
- type: Blog
  url: https://mailtrap.io/blog/feed/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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Mailtrap

Kin Score

APIs 3

Mailtrap Inboxes API

Mailtrap Messages API

Mailtrap Send API

Open Collections 6

API Collection

Mailtrap Email Sending API

Mailtrap Email Sandbox API

Mailtrap Email Sending Inboxes API

Mailtrap Email Sending Inboxes Messages API

Mailtrap Email Sending Inboxes Send API

Pricing Plans 1

Mailtrap Plans Pricing