# Postmark

> Postmark Transactional Email API Skill

- Skill: `ashish7802/postmark` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add ashish7802/postmark`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ashish7802/postmark/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: ashish7802 (https://skillmd.com/u/ashish7802)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/ashish7802/postmark

---

# Postmark Transactional Email API Skill

## Overview
Postmark specializes in lightning-fast transactional email delivery with industry-leading inbox placement, detailed bounce classification, and templating.

## Installation
```bash
npm install postmark
```

## Setup & Sending Emails
```typescript
import { ServerClient } from 'postmark';

const client = new ServerClient(process.env.POSTMARK_SERVER_API_TOKEN!);

// Send single transactional email
await client.sendEmail({
  From: 'support@myverifieddomain.com',
  To: 'user@example.com',
  Subject: 'Password Reset Request',
  HtmlBody: '<p>Click <a href="https://example.com/reset">here</a> to reset your password.</p>',
  TextBody: 'Visit https://example.com/reset to reset your password.',
  MessageStream: 'outbound',
});
```

## Sending via Postmark Template
```typescript
await client.sendEmailWithTemplate({
  From: 'notifications@myverifieddomain.com',
  To: 'customer@example.com',
  TemplateAlias: 'welcome-email',
  TemplateModel: {
    name: 'Alex',
    action_url: 'https://myverifieddomain.com/dashboard',
    product_name: 'Awesome Platform',
  },
});
```

## AI Pitfalls & Anti-Hallucination Guidelines
- **Token Confusion**: Postmark has Account API Tokens (admin operations) and Server API Tokens (sending emails). Do not send emails using Account Tokens.
- **Sender Signatures**: Attempting to send from an unverified `From` address will return an HTTP 422 error.

## Production Verification Checklist
- [ ] SPF, DKIM, and DMARC DNS records configured on sending domain
- [ ] Inbound webhooks verified with IP filtering or basic auth
- [ ] Bounce webhook configured to suppress inactive email addresses

---
> **Last Verified:** 2026-07-03