Mailgun MCP Server
OfficialA Model Context Protocol server implementation that enables AI assistants like Claude Desktop to int...
Obtain a Mailgun API key (Account API key — required)
- Sign in to your Mailgun dashboard (app.mailgun.com or app.eu.mailgun.com). (help.mailgun.com)
- Open your Profile / Account menu and go to “API Security” (or Account Settings → API Keys). (help.mailgun.com)
- Click “Add new key” / “Create Key”, give the key a description, choose a role, and confirm creation. (help.mailgun.com)
- Copy the generated API key immediately — it is shown only once. Save it in a secure place (password manager or secret store). (help.mailgun.com)
(Optional) Create a Domain Sending Key instead (if you only need sending permissions)
- In the Mailgun dashboard go to Sending → Domains, select your domain, then the “Sending API keys” tab. (documentation.mailgun.com)
- Click “Add Sending Key”, give it a description, create it, then copy and save the key (also shown only once). (documentation.mailgun.com)
Decide the MAILGUN_API_REGION value
- If your Mailgun dashboard URL is app.mailgun.com (US), use MAILGUN_API_REGION=us. If it is app.eu.mailgun.com (EU), use MAILGUN_API_REGION=eu. Mailgun uses different base API endpoints for US vs EU. (documentation.mailgun.com)
- Note: MAILGUN_API_REGION is optional and defaults to "us" in the MCP config sample; set it explicitly if your account or domain is in the EU. (README config expects MAILGUN_API_KEY and MAILGUN_API_REGION.) (documentation.mailgun.com)
Add the values into the FastMCP connection interface using the “Install Now” button
- Open the FastMCP connection interface for this MCP server and click the ready-made “Install Now” button to add environment variables.
- Enter the environment keys exactly as shown in the MCP config:
- MAILGUN_API_KEY — paste the API key you copied.
- MAILGUN_API_REGION — set to "us" or "eu" as determined above (optional; default "us").
- Save/confirm the connection in FastMCP. The MCP server will read the MAILGUN_API_KEY from the env and use the specified region for API requests.
Verify the connection
- Use the MCP client to call a harmless read-only tool (for example, list domains or fetch account details) to confirm authentication works. If you get a 401/403, double-check the key and region. (documentation.mailgun.com)
Security & rotation reminders
- Store the key securely (password manager or secrets manager); do not commit it to source control. (help.mailgun.com)
- Rotate keys periodically or create scoped Domain Sending Keys to limit blast radius. If you lose a key, create a new one and update FastMCP. (documentation.mailgun.com)
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Configuration for
Environment Variables
Please provide values for the following environment variables:
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Please provide values for the following HTTP headers:
started!
The MCP server should open in . If it doesn't open automatically, please check that you have the application installed.
Copy and run this command in your terminal:
Make sure Gemini CLI is installed:
Visit Gemini CLI documentation for installation instructions.
Make sure Claude Code is installed:
Visit Claude Code documentation for installation instructions.
Installation Steps:
Configuration
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