MailerSend website screenshot

MailerSend

MailerSend is a transactional email and SMS platform built for developers, with email API, SMTP relay, templates, and analytics.

MailerSend publishes 7 APIs on the APIs.io network, including Bulk Email API, Domains API, Email API, and 4 more. Tagged areas include Email, Transactional Email, SMTP, Marketing, and Communications.

MailerSend’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
33.4/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessSelf serve
8 APIs
EmailTransactional EmailSMTPMarketingCommunications

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 33.4/100 · thin
Contract Quality 13.8 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 3.4 / 13
Governance 0.0 / 12
Discoverability 6.5 / 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/mailersend: 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 8

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

MailerSend API

MailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domains, recipients, suppression lists, webhooks, analytics, SMS, and inbou...

MailerSend Bulk Email API

The Bulk Email API from MailerSend — 2 operation(s) for bulk email.

MailerSend Domains API

The Domains API from MailerSend — 2 operation(s) for domains.

MailerSend Email API

The Email API from MailerSend — 1 operation(s) for email.

MailerSend Messages API

The Messages API from MailerSend — 2 operation(s) for messages.

MailerSend Sender Identities API

The Sender Identities API from MailerSend — 1 operation(s) for sender identities.

MailerSend Templates API

The Templates API from MailerSend — 2 operation(s) for templates.

MailerSend Webhooks API

The Webhooks API from MailerSend — 2 operation(s) for webhooks.

Scroll for all 8

Open Collections 1

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

MailerSend API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Mailersend Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mailersend Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Mailersend Finops

FINOPS

Security Posture 2

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

Mailersend Authentication

http · 1 scheme

SECURITY

Mailersend Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Mailersend Agentic Access

16 operations · 7 acting

16 operations · 7 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

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 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: mailersend
url: https://raw.githubusercontent.com/api-evangelist/mailersend/refs/heads/main/apis.yml
name: MailerSend
kind: company
description: MailerSend is a transactional email and SMS platform built for developers, with email API, SMTP relay, templates,
  and analytics.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: 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/mailersend.png
tags:
- Email
- Transactional Email
- SMTP
- Marketing
- Communications
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.19'
apis:
- aid: mailersend:mailersend-api
  name: MailerSend API
  description: MailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domains,
    recipients, suppression lists, webhooks, analytics, SMS, and inbound routing.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Email
  - Transactional
  - REST
  properties:
  - type: Documentation
    url: https://developers.mailersend.com/
  - type: Email Endpoint
    url: https://developers.mailersend.com/api/v1/email.html
- aid: mailersend:mailersend-bulk-email-api
  name: MailerSend Bulk Email API
  description: The Bulk Email API from MailerSend — 2 operation(s) for bulk email.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Bulk Email
  properties:
  - type: OpenAPI
    url: openapi/mailersend-bulk-email-api-openapi.yml
- aid: mailersend:mailersend-domains-api
  name: MailerSend Domains API
  description: The Domains API from MailerSend — 2 operation(s) for domains.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Domains
  properties:
  - type: OpenAPI
    url: openapi/mailersend-domains-api-openapi.yml
- aid: mailersend:mailersend-email-api
  name: MailerSend Email API
  description: The Email API from MailerSend — 1 operation(s) for email.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Email
  properties:
  - type: OpenAPI
    url: openapi/mailersend-email-api-openapi.yml
- aid: mailersend:mailersend-messages-api
  name: MailerSend Messages API
  description: The Messages API from MailerSend — 2 operation(s) for messages.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/mailersend-messages-api-openapi.yml
- aid: mailersend:mailersend-sender-identities-api
  name: MailerSend Sender Identities API
  description: The Sender Identities API from MailerSend — 1 operation(s) for sender identities.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Sender Identities
  properties:
  - type: OpenAPI
    url: openapi/mailersend-sender-identities-api-openapi.yml
- aid: mailersend:mailersend-templates-api
  name: MailerSend Templates API
  description: The Templates API from MailerSend — 2 operation(s) for templates.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/mailersend-templates-api-openapi.yml
- aid: mailersend:mailersend-webhooks-api
  name: MailerSend Webhooks API
  description: The Webhooks API from MailerSend — 2 operation(s) for webhooks.
  humanURL: https://developers.mailersend.com/
  baseURL: https://api.mailersend.com/v1
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/mailersend-webhooks-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/mailersend-agentic-access.yml
- type: DomainSecurity
  url: security/mailersend-domain-security.yml
- type: Authentication
  url: authentication/mailersend-authentication.yml
- type: GitHubOrganization
  url: https://github.com/mailersend
- type: LinkedIn
  url: https://www.linkedin.com/company/mailersend
- type: Website
  url: https://www.mailersend.com/
- type: Documentation
  url: https://developers.mailersend.com/
- type: Plans
  url: plans/mailersend-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mailersend-rate-limits.yml
- type: FinOps
  url: finops/mailersend-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com