# Postmark.js Email Delivery API for Transactional Messaging

> postmark.js is the official Node.js library for the Postmark API, used to send transactional email, templates, and message streams from code. It is a strong fit for skills that automate outbound notifications, email workflows, and delivery-aware application integrations.

- Skill: `agentskillexchange/postmark-js-email-delivery-api-for-transactional-messaging` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/postmark-js-email-delivery-api-for-transactional-messaging`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/postmark-js-email-delivery-api-for-transactional-messaging/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/postmark-js-email-delivery-api-for-transactional-messaging

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# Postmark.js Email Delivery API for Transactional Messaging

postmark.js is the official Node.js library for the Postmark API, used to send transactional email, templates, and message streams from code. It is a strong fit for skills that automate outbound notifications, email workflows, and delivery-aware application integrations.

## Prerequisites

Node.js and a Postmark server token

## Installation

Use the upstream install or setup path that matches your environment:
- npm install postmark

Requirements and caveats from upstream:
- # Postmark Node.js Library
- Now your node.js application can send emails through [Postmark](http://www.postmarkapp.com).
- As the official Node.js library for Postmark, postmark.js has support for the entire REST API.

Basic usage or getting-started notes:
- [active and security support ended](https://endoflife.date/nodejs) , you will need to use older library versions (3.x.x).
- Please see the [wiki](https://github.com/ActiveCampaign/postmark.js/wiki) for quick start tutorial and detailed instructions about sending email at our [documentation page](https://ActiveCampaign.github.io/postmark.js/).
- For details about Postmark API in general, please check out [Postmark developer docs](https://postmarkapp.com/developer).

- Source: https://github.com/ActiveCampaign/postmark.js
- Extracted from upstream docs: https://raw.githubusercontent.com/ActiveCampaign/postmark.js/HEAD/README.md

## Documentation

- https://postmarkapp.com/developer

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/postmarkjs-email-delivery-api-transactional-messaging/)