Data & Analytics

Postmark Transactional Email

Send transactional emails with Postmark for industry-leading delivery speed and inbox placement rates.

Claude Code Cursor Copilot Windsurf

Overview

Postmark specializes exclusively in transactional email, achieving industry-leading delivery speeds with a median delivery time under 1 second. Unlike platforms that mix marketing and transactional email, Postmark maintains separate IP infrastructure for transactional messages, resulting in consistently high inbox placement rates. The postmark.js library provides a clean API for all Postmark features.

Postmark offers server-side templates with a Mustachio-based templating language, or you can send raw HTML. The platform includes pre-built templates for common flows like password resets, welcome emails, and receipts that follow email best practices. Message streams separate different types of email (transactional vs broadcast) to maintain deliverability.

The platform provides detailed delivery analytics, bounce management with classification (hard bounce, soft bounce, spam complaint), and automatic suppression handling. The Inbound API routes incoming emails to your application via webhook. Postmark also offers a SMTP integration for applications that need to send email through a traditional SMTP server. The free developer plan includes 100 emails per month for testing.

Who Is This For?

Send time-critical transactional emails like OTP codes
Use server-side templates for consistent email formatting
Monitor delivery rates and bounce management
Process inbound emails for support ticket creation

Installation

Setup for Claude Code

npm install postmark

Configuration

import { ServerClient } from "postmark"

const client = new ServerClient(process.env.POSTMARK_SERVER_TOKEN!)

// Send with template
await client.sendEmailWithTemplate({
  From: "noreply@myapp.com",
  To: "user@example.com",
  TemplateAlias: "password-reset",
  TemplateModel: {
    name: "John",
    action_url: "https://myapp.com/reset?token=xxx",
  },
})