Postmark MCP Server
Send single and batch transactional emails, manage and validate templates, search message history, and diagnose delivery failures, bounces, and suppressions in Postmark.
- Maintained by
- Postmark (ActiveCampaign)
- Hosting
- Runs locally on your machine
- Authentication
- API key or credentials (environment variables)
- Last checked
Sender email must be a verified Postmark sender; server acts with the token's full permissions.
How to connect the Postmark MCP server
Pick your AI client and paste the snippet. Swap the YOUR_… placeholders for your own values. New to this? Our guide to how MCP clients and servers fit together explains what each piece does.
Claude Code
claude mcp add --env POSTMARK_SERVER_TOKEN=YOUR_SERVER_TOKEN --env DEFAULT_SENDER_EMAIL=YOUR_SENDER_EMAIL --env DEFAULT_MESSAGE_STREAM=outbound --transport stdio postmark \
-- npx -y @activecampaign/postmark-mcpClaude Desktop
{
"mcpServers": {
"postmark": {
"command": "npx",
"args": [
"-y",
"@activecampaign/postmark-mcp"
],
"env": {
"POSTMARK_SERVER_TOKEN": "YOUR_SERVER_TOKEN",
"DEFAULT_SENDER_EMAIL": "YOUR_SENDER_EMAIL",
"DEFAULT_MESSAGE_STREAM": "outbound"
}
}
}
}Fully quit and reopen Claude Desktop after saving.
Full Claude Desktop setup guide →Cursor
{
"mcpServers": {
"postmark": {
"command": "npx",
"args": [
"-y",
"@activecampaign/postmark-mcp"
],
"env": {
"POSTMARK_SERVER_TOKEN": "YOUR_SERVER_TOKEN",
"DEFAULT_SENDER_EMAIL": "YOUR_SENDER_EMAIL",
"DEFAULT_MESSAGE_STREAM": "outbound"
}
}
}
}VS Code
{
"servers": {
"postmark": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@activecampaign/postmark-mcp"
],
"env": {
"POSTMARK_SERVER_TOKEN": "YOUR_SERVER_TOKEN",
"DEFAULT_SENDER_EMAIL": "YOUR_SENDER_EMAIL",
"DEFAULT_MESSAGE_STREAM": "outbound"
}
}
}
}Frequently asked questions
What is the Postmark MCP server?
It is a Model Context Protocol (MCP) server — a small piece of software that gives AI assistants like Claude a secure, governed connection to Postmark. Send single and batch transactional emails, manage and validate templates, search message history, and diagnose delivery failures, bounces, and suppressions in Postmark.
Is there an official Postmark MCP server?
Yes. The Postmark MCP server is an official integration, maintained by the vendor or the Model Context Protocol project, which makes it the safest default for business use. It is maintained by Postmark (ActiveCampaign).
Is the Postmark MCP server hosted, or do I run it myself?
It runs locally. Your AI client starts it on your own machine with npx, and it talks to the client over standard input and output rather than the network.
Do I need an API key for the Postmark MCP server?
Yes. The local server reads POSTMARK_SERVER_TOKEN, DEFAULT_SENDER_EMAIL, DEFAULT_MESSAGE_STREAM from its environment, so you create those credentials first and add them to your client's config.
What can an AI assistant actually do with Postmark?
Through this server an assistant can work with email sending, templates, delivery diagnostics, suppressions — reading from and acting on Postmark directly instead of you copy-pasting between windows. What you allow it to do is controlled by the permissions you grant.
How do I set this up for my business?
The setup section above has copy-paste config for Claude Code, Claude Desktop, Cursor and VS Code. If you want it rolled out across a team with permissions, governance and support handled, that is what Crox's Build engagement covers.
New to MCP? Start with our plain-English guide to the Model Context Protocol or see how to connect AI to your business tools without writing code .
Want this connected to your business — with governance handled?
Crox maps your processes, connects AI to the tools you already use, and keeps it working as models change. Start with a readiness assessment or talk to us about a build.