How do I install the Postmark skill?

Run npx skillmds@latest add activecampaign/postmark in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Postmark safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls, reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Postmark?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Postmark free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under MIT.

Who published Postmark?

activecampaign (@activecampaign) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Postmark by activecampaign — Agent Skill

Name: Postmark
Rating: 4.666666666666667 (3 reviews)
Author: activecampaign

File contents

Postmark Skills

Postmark is a transactional email platform built for developers, with 15+ years of deliverability expertise. These skills teach AI agents how to use the Postmark API effectively.

Sub-Skills

Feature	Skill	Use When
Sending emails	`postmark-send-email`	Sending transactional or broadcast emails — single, batch, bulk, or with templates
Inbound processing	`postmark-inbound`	Processing incoming emails via webhooks, building reply-by-email, email-to-ticket, or document extraction
Template management	`postmark-templates`	Creating, editing, or sending with Postmark's server-side Handlebars templates and layouts
Webhooks	`postmark-webhooks`	Setting up webhooks for delivery, bounce, open, click, spam complaint, and subscription change events
Best practices	`postmark-email-best-practices`	Deliverability setup, compliance (CAN-SPAM/GDPR/CASL), email design, list management, testing, and sending reliability

Quick Routing

"Send an email" → postmark-send-email
"Send a batch of emails" → postmark-send-email
"Send using a template" → postmark-send-email (template section) or postmark-templates (to create/manage templates)
"Handle incoming email" → postmark-inbound
"Process inbound webhooks" → postmark-inbound
"Create an email template" → postmark-templates
"Track deliveries/bounces/opens" → postmark-webhooks
"Set up bounce handling" → postmark-webhooks
"Set up SPF/DKIM/DMARC" → postmark-email-best-practices
"Email compliance / GDPR / CAN-SPAM" → postmark-email-best-practices
"Domain warm-up" → postmark-email-best-practices
"List hygiene / suppression management" → postmark-email-best-practices
"Design a transactional email" → postmark-email-best-practices
"Test email safely" → postmark-email-best-practices

Common Setup

Authentication

Postmark uses two types of API tokens:

Token	Header	Scope
Server Token	`X-Postmark-Server-Token`	Sending emails, templates, bounces, webhooks, message streams
Account Token	`X-Postmark-Account-Token`	Managing servers, domains, sender signatures

Get your Server API Token from Postmark Servers.

SDK Installation

Detect the project language and install the appropriate SDK:

File	Language	Install Command
`package.json`	Node.js / TypeScript	`npm install postmark`
`requirements.txt` / `pyproject.toml`	Python	`pip install postmarker`
`Gemfile`	Ruby	`gem install postmark`
`composer.json`	PHP	`composer require wildbit/postmark-php`
`.csproj` / `.sln`	.NET	`dotnet add package Postmark`

Message Streams

Postmark separates email by intent into Message Streams:

Stream	Value	Purpose
Transactional	`outbound`	1:1 triggered emails (welcome, password reset, receipts) — default
Broadcast	`broadcast`	Marketing, newsletters, announcements

Never mix transactional and broadcast email in the same stream — it damages deliverability.

Resources

---name: postmarkdescription: Use when working with Postmark email platform - routes to specific sub-skills for sending emails, processing inbound email, managing templates, or configuring webhooks.license: MIT--- # Postmark Skills Postmark is a transactional email platform built for developers, with 15+ years of deliverability expertise. These skills teach AI agents how to use the Postmark API effectively. ## Sub-Skills | Feature | Skill | Use When | |---------|-------|----------| | **Sending emails** | `postmark-send-email` | Sending transactional or broadcast emails — single, batch, bulk, or with templates | | **Inbound processing** | `postmark-inbound` | Processing incoming emails via webhooks, building reply-by-email, email-to-ticket, or document extraction | | **Template management** | `postmark-templates` | Creating, editing, or sending with Postmark's server-side Handlebars templates and layouts | | **Webhooks** | `postmark-webhooks` | Setting up webhooks for delivery, bounce, open, click, spam complaint, and subscription change events | | **Best practices** | `postmark-email-best-practices` | Deliverability setup, compliance (CAN-SPAM/GDPR/CASL), email design, list management, testing, and sending reliability | ## Quick Routing - **"Send an email"** → `postmark-send-email` - **"Send a batch of emails"** → `postmark-send-email` - **"Send using a template"** → `postmark-send-email` (template section) or `postmark-templates` (to create/manage templates) - **"Handle incoming email"** → `postmark-inbound` - **"Process inbound webhooks"** → `postmark-inbound` - **"Create an email template"** → `postmark-templates` - **"Track deliveries/bounces/opens"** → `postmark-webhooks` - **"Set up bounce handling"** → `postmark-webhooks` - **"Set up SPF/DKIM/DMARC"** → `postmark-email-best-practices` - **"Email compliance / GDPR / CAN-SPAM"** → `postmark-email-best-practices` - **"Domain warm-up"** → `postmark-email-best-practices` - **"List hygiene / suppression management"** → `postmark-email-best-practices` - **"Design a transactional email"** → `postmark-email-best-practices` - **"Test email safely"** → `postmark-email-best-practices` ## Common Setup ### Authentication Postmark uses two types of API tokens: | Token | Header | Scope | |-------|--------|-------| | **Server Token** | `X-Postmark-Server-Token` | Sending emails, templates, bounces, webhooks, message streams | | **Account Token** | `X-Postmark-Account-Token` | Managing servers, domains, sender signatures | Get your Server API Token from [Postmark Servers](https://account.postmarkapp.com/servers). ### SDK Installation Detect the project language and install the appropriate SDK: | File | Language | Install Command | |------|----------|----------------| | `package.json` | Node.js / TypeScript | `npm install postmark` | | `requirements.txt` / `pyproject.toml` | Python | `pip install postmarker` | | `Gemfile` | Ruby | `gem install postmark` | | `composer.json` | PHP | `composer require wildbit/postmark-php` | | `*.csproj` / `*.sln` | .NET | `dotnet add package Postmark` | ### Message Streams Postmark separates email by intent into **Message Streams**: | Stream | Value | Purpose | |--------|-------|---------| | **Transactional** | `outbound` | 1:1 triggered emails (welcome, password reset, receipts) — **default** | | **Broadcast** | `broadcast` | Marketing, newsletters, announcements | Never mix transactional and broadcast email in the same stream — it damages deliverability. ## Resources - [Postmark Developer Docs](https://postmarkapp.com/developer) - [API Reference](https://postmarkapp.com/developer/api/overview) - [Postmark API for LLMs](https://postmarkapp.com/llms.txt) - [Postmark Dashboard](https://account.postmarkapp.com)

Frequently asked questions

Postmark