postmark
Use when working with Postmark email platform - routes to specific sub-skills for sending emails, processing inbound email, managing templates, or configuring webhooks.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/activecampaign/postmark-skills --skill postmark- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads postmark automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
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 outbound webhooks for delivery, bounce, open, click, spam complaint, and subscription change events — including endpoint verification, per-webhook statistics, and retry behavior |
| Best practices | postmark-email-best-practices | Deliverability setup, compliance (CAN-SPAM/GDPR/CASL), email design, list management, testing, and sending reliability |
Outbound and inbound webhooks are different systems
postmark-webhooks covers outbound event webhooks; postmark-inbound covers inbound email webhooks. They run on separate infrastructure and have different retry schedules — do not apply one to the other:
Outbound webhooks (postmark-webhooks) | Inbound webhooks (postmark-inbound) | |
|---|---|---|
| Retries | Up to 9 retries over ~72 minutes (3 standard + 6 backoff) | Up to 10 retries over ~10.5 hours |
| Retried on | 5xx, 408, 429, network timeouts only — every other 4xx is permanent | Any non-200 response |
Endpoint verification and per-webhook statistics are outbound features — see postmark-webhooks.
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) orpostmark-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 - "Verify a webhook endpoint" / "my webhook is unverified" →
postmark-webhooks - "Webhook statistics / failure rate / why is my webhook paused" →
postmark-webhooks - "Webhook retries" →
postmark-webhooks(outbound events) orpostmark-inbound(inbound email) - "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
FAQ
What does the postmark skill do?
Use when working with Postmark email platform - routes to specific sub-skills for sending emails, processing inbound email, managing templates, or configuring webhooks.
How do I install postmark?
Run npx skills add https://github.com/activecampaign/postmark-skills --skill postmark in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/postmark/ (personal) or .claude/skills/postmark/ (project).
Which AI agents can use postmark?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is postmark safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains postmark?
It is published by activecampaign in activecampaign/postmark-skills. It has 785 recorded installs.
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