Mailtrap website screenshot

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
53.0/100 developing ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
3 APIs
EmailEmail DeliveryEmail SandboxEmail TestingTransactional Email

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 53.0/100 · developing
Contract Quality 15.0 / 25
Developer Ergonomics 7.0 / 20
Commercial Clarity 16.8 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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
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.

Mailtrap Inboxes API

Manage sandbox inboxes

Mailtrap Messages API

Inspect captured messages

Mailtrap Send API

Send transactional and bulk emails

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Mailtrap Email Sending API

OPEN COLLECTION

Mailtrap Email Sandbox API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Mailtrap Plans Pricing

3 plans

PLANS

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.

Mailtrap Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Mailtrap Authentication

apiKey/http · 2 schemes

SECURITY

Mailtrap Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Mailtrap Agentic Access

23 operations · 12 acting · 1 human-in-the-loop

23 operations · 12 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal
Portal
 Signup
Signup
 Login
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
LinkedIn
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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: '0.19'
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:
  - 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