Add the Mailgun MCP server to Claude Code

Config last verified Jun 1, 2026

The exact config to run Mailgun in Claude Code — paste it in, restart, and the tools load.

Prerequisites

Claude Code installed.
MAILGUN_API_KEY — Your Mailgun API key.

Setup

1. Open `~/.claude.json`

2. Add this configuration

Add to ~/.claude.json

~/.claude.json

json

{
  "mcpServers": {
    "mailgun": {
      "command": "npx",
      "args": [
        "-y",
        "@mailgun/mcp-server"
      ],
      "env": {
        "MAILGUN_API_KEY": "<MAILGUN_API_KEY>",
        "MAILGUN_API_REGION": "<MAILGUN_API_REGION>",
        "MAILGUN_MCP_TAGS": "<MAILGUN_MCP_TAGS>"
      }
    }
  }
}

Or via CLI

bash

claude mcp add mailgun -- npx -y @mailgun/mcp-server

3. Restart Claude Code and confirm the Mailgun tools load.

Gotchas

Claude Code stores MCP servers under an "mcpServers" object in ~/.claude.json. It also reads a project-scoped .mcp.json and supports adding servers from the command line with "claude mcp add". Each entry must declare either a "type" or a "command"; Claude Code refuses an entry that has neither. Remote servers connect natively over Streamable HTTP with OAuth.

← Back to the Mailgun MCP server