How to integrate Postmark MCP with OpenClaw

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Introduction

OpenClaw is the fastest growing agent harness out there, which can work 24/7 to automate almost any kind of tasks. However, its capabilities are limited to the tools it has access to. Composio allows your OpenClaw to access Postmark with authentication management handled for you. You can execute actions on Postmark via your favorite OpenClaw interface (Telegram, WhatsApp, TUI, etc), whichever you prefer.

Also integrate Postmark with

Why use Composio?

Apart from a managed and hosted MCP server, you will get:

  • Programmatic tool calling allows LLMs to write its code in a remote workbench to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Handling Large tool responses out of LLM context to minimize context rot.
  • Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so LLMs aren't overwhelmed by tools you don't need.

How to install Postmark with OpenClaw

Using Composio API Key and Setup Prompt

Copy the setup prompt from the OpenClaw dashboard
  • Run it in your OpenClaw chat interface.
  • Authenticate Postmark from the dashboard
  • Go back to your OpenClaw interface and start asking questions.

Using OpenClaw/Composio Plugin

1. Install OpenClaw Composio plugin

bash
openclaw plugins install @composio/openclaw-plugin

2. Copy the API Key from dashboard.composio.dev

3. Setup OpenClaw Config

bash
openclaw config set plugins.entries.composio.config.consumerKey "ck_your_key_here"

4. Restart OpenClaw

bash
openclaw gateway restart

5. Go to your chat interface and start asking questions.

6. When prompted, authenticate the app and you're all set.

How It Works

The plugin connects to Composio's MCP server at https://connect.composio.dev/mcp and registers all available tools directly into the OpenClaw agent. Tools are called by name — no extra search or execute steps needed.

If a tool returns an auth error, the agent will prompt you to connect that toolkit at dashboard.composio.dev.

Configuration

bash
{
  "plugins": {
    "entries": {
      "composio": {
        "enabled": true,
        "config": {
          "consumerKey": "ck_your_key_here"
        }
      }
    }
  }
}
OptionDescriptionDefault
enabledEnable or disable the plugintrue
consumerKeyYour Composio consumer key (ck_...)—
mcpUrlMCP server URL (advanced)https://connect.composio.dev/mcp

What is the Postmark MCP server, and what's possible with it?

The Postmark MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Postmark account. It provides structured and secure access to transactional email sending and analytics, so your agent can perform actions like delivering transactional emails, monitoring delivery status, managing templates, and analyzing engagement metrics on your behalf.

  • Automated transactional email delivery: Let your agent send password resets, confirmations, and notification emails with high deliverability and reliability.
  • Template management and customization: Enable your agent to create, update, or select dynamic email templates for consistent, branded communications.
  • Email delivery status monitoring: Ask your agent to track sent messages, check delivery receipts, and identify bounced or failed emails in real time.
  • Engagement and analytics tracking: Have your agent retrieve open and click data, analyze engagement trends, and provide actionable insights from your email campaigns.
  • Suppression list and recipient management: Direct your agent to manage suppression lists, process unsubscribes, and maintain healthy recipient lists automatically.

Supported Tools & Triggers

Tools
Archive Message StreamTool to archive a message stream (soft delete).
Check Spam ScoreTool to assess the spam score of a raw email via the SpamCheck API.
Create Inbound RuleTool to create a new inbound rule trigger to block email from a specific sender or domain.
Create Message StreamTool to create a new message stream.
Create SuppressionsTool to add email addresses to the suppression list for a message stream.
Create TemplateTool to create a new email template.
Create WebhookTool to create a new webhook configuration for Postmark.
Delete Inbound RuleTool to delete a specific inbound rule trigger.
Delete SuppressionsTool to remove email addresses from the suppression list for a message stream.
Delete TemplateTool to delete a template by its ID or alias.
Delete WebhookTool to delete a specific webhook.
Edit ServerTool to update settings for the current Postmark server.
Edit TemplateTool to update an existing Postmark template by its ID.
Edit WebhookTool to update an existing webhook’s URL or triggers.
Get Bounce CountsTool to get total counts of emails that have been returned as bounced.
Get BouncesTool to retrieve a list of bounces for a server with optional filters.
Get Browser Platform UsageTool to retrieve browser platform usage statistics for clicked links.
Get Browser UsageTool to retrieve browser usage statistics for clicked links.
Get Click CountsTool to retrieve total click counts across all links in emails.
Get Clicks By Browser FamilyTool to retrieve click statistics grouped by browser family.
Get Clicks by LocationTool to get an overview of which part of the email links were clicked from (HTML or Text).
Get Delivery StatsTool to retrieve delivery statistics.
Get Email Client UsageTool to retrieve statistics on email clients used to open emails.
Get Email Open CountsTool to retrieve counts of opened emails.
Get Message StreamTool to retrieve details of a specific message stream by its ID.
Get Opens by PlatformTool to retrieve email open statistics by platform type.
Get Outbound OverviewTool to retrieve outbound email statistics overview.
Get Sent CountsTool to retrieve total count of emails sent out.
Get ServerTool to retrieve details of the current Postmark server.
Get Spam ComplaintsTool to retrieve counts of spam complaints.
Get TemplateTool to retrieve details of a specific template by its ID.
Get Tracked Email CountsTool to retrieve counts of emails with tracking enabled.
Get WebhookTool to retrieve details of a specific webhook by its ID.
List Inbound RulesTool to list all inbound rules (triggers) configured for blocking senders.
List Message StreamsTool to list all message streams for a Postmark server with optional type and archive filtering.
List Outbound Message ClicksTool to list clicks for outbound messages with filtering options.
List Outbound Message OpensTool to retrieve opens for outbound messages with filtering options.
List SuppressionsTool to retrieve the suppression list for a message stream with optional filtering.
List TemplatesTool to list all templates for a Postmark server.
List WebhooksTool to list all webhooks configured for your Postmark account.
Search Inbound MessagesTool to search inbound messages received with optional filtering.
Search Outbound MessagesTool to search outbound messages with filtering by recipient, tag, status, and date range.
Send Batch Templated EmailsTool to send multiple templated emails in a single batch API call.
Unarchive Message StreamTool to unarchive a previously archived message stream.
Update Message StreamTool to update a message stream configuration in Postmark.
Validate TemplateTool to validate a Postmark template.

Conclusion

You've successfully integrated Postmark with OpenClaw using Composio plugin. Now interact with Postmark directly from your terminal, Web UI, or any messenger app using natural language commands.

Key benefits of this setup:

  • Seamless integration across TUI, Web UIs, and Messenger apps like Telegram, WhatsApp, Slack, etc.
  • Natural language commands for Postmark operations
  • Managed authentication through Composio
  • Access to 20,000+ tools across 1000+ apps for cross-app workflows
  • Programmatic tool calling for complex tool chaining

Next steps:

  • Try asking OpenClaw to perform various Postmark operations
  • Explore cross-app workflows by connecting more toolkits like Calendar, Slack, Notion, etc.
  • Build complex automation scripts that leverage OpenClaw's 24/7 running capabilities

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FAQ

What are the differences in Tool Router MCP and Postmark MCP?

With a standalone Postmark MCP server, the agents and LLMs can only access a fixed set of Postmark tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Postmark and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with OpenClaw?

Yes, you can. OpenClaw fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Postmark tools.

Can I manage the permissions and scopes for Postmark while using Tool Router?

Yes, absolutely. You can configure which Postmark scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Postmark data and credentials are handled as safely as possible.

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