Postmark

Postmark Email API

The Email API from Postmark — 4 operation(s) for email.

Documentation GitHub OpenAPI

Operations 2

Each operation below carries the questions people ask an LLM about it and the instructions they give an agent to run it. Generated by API Evangelist overlay

POST /email Send a single email · Postmark Send a single email #

Ask an LLM

“How do I send one transactional email with Postmark?”

“Can I turn on open and click tracking for an individual email?”

Tell an agent

Send this one email now through my Postmark server.

Send a single plain-text transactional message to this recipient.

POST /email/withTemplate Send an email from a template · Postmark Send an email using a Template #

Ask an LLM

“How do I send an email using one of my saved templates?”

“Can I fill template variables with my own data when sending?”

Tell an agent

Send one email built from my saved template with this model data.

Email this recipient using one of my templates instead of a raw body.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/postmark:postmark-email-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Postmark Email API
  description: 'Postmark helps deliver and track application email. In a nutshell, the

    service replaces SMTP (or Sendmail) with a far more reliable, scalable and

    care-free environment. In addition, you can track statistics such as

    number of emails sent or processed, opens, bounces and spam complaints.'
  version: 1.0.0
servers:
- url: http://{{baseurl}}
tags:
- name: Email
paths:
  /email:
    post:
      tags:
      - Email
      summary: Postmark Send a single email
      requestBody:
        content: {}
      responses:
        '200':
          description: Successful response
          content:
            application/json: {}
      operationId: postEmail
      x-operation-id-source: derived
  /email/withTemplate:
    post:
      tags:
      - Email
      summary: Postmark Send an email using a Template
      requestBody:
        content: {}
      responses:
        '200':
          description: Successful response
          content:
            application/json: {}
      operationId: postEmailWithTemplate
      x-operation-id-source: derived