READMEmaster

Email MCP Server

An MCP (Model Context Protocol) server that lets your AI assistant send emails via SMTP.

Features

send_simple_email — Send a quick email (text or HTML); accepts optional smtp_config
send_custom_email — Full control: CC/BCC, attachments; accepts optional smtp_config
test_smtp_connection — Verify your SMTP settings before sending; accepts optional smtp_config

Quick Start

# Install uv if you don't have it
curl -LsSf https://astral.sh/uv/install.sh | sh

cd email-mcp-server
uv sync --extra dev

Configure SMTP (see next section), then run:

# stdio transport (for MCP clients)
uv run python -m email_mcp_server.server

# Streamable HTTP transport (port 8000)
uv run python -m email_mcp_server.server --http

Run tests:

uv run pytest

SMTP Configuration

You can configure SMTP credentials in two ways — use one or both.

Option A: Environment variables

Copy the example and fill in your credentials:

cp env.example .env

# Required
SMTP_HOST=smtp.gmail.com
SMTP_USER=your-email@gmail.com
SMTP_PASS=your-app-password
SMTP_FROM=your-email@gmail.com

# Optional (defaults shown)
# SMTP_PORT=587
# SMTP_SECURE=false

Alternatively, pass them via the client's env block (see Client Configuration below).

Option B: Per-call payload

Pass smtp_config directly in any tool call — environment variables are ignored for that call:

{
  "smtp_config": {
    "host": "smtp.gmail.com",
    "port": 587,
    "secure": false,
    "username": "your-email@gmail.com",
    "password": "your-app-password",
    "from_email": "your-email@gmail.com"
  }
}

Field	Type	Description
`host`	string	SMTP server hostname
`port`	integer	SMTP server port (usually `587`)
`secure`	boolean	Use SSL/TLS (`false` for STARTTLS)
`username`	string	Auth username
`password`	string	Auth password
`from_email`	string	Sender email address

Client Configuration

Claude Code

# stdio
claude mcp add email-server -- uv --directory /absolute/path/to/email-mcp-server run python -m email_mcp_server.server

# streamable HTTP (start the server first with --http)
claude mcp add --transport http email-server http://localhost:8000/mcp

JSON-based clients (Claude Desktop, Cursor, VS Code, Windsurf, Zed)

Use the generic example below and adjust the top-level key and config file path for your client:

{
  "<top-level-key>": {
    "email-server": {
      "command": "uv",
      "args": ["--directory", "/absolute/path/to/email-mcp-server", "run", "python", "-m", "email_mcp_server.server"],
      "env": {
        "SMTP_HOST": "smtp.gmail.com",
        "SMTP_PORT": "587",
        "SMTP_SECURE": "false",
        "SMTP_USER": "your-email@gmail.com",
        "SMTP_FROM": "your-email@gmail.com",
        "SMTP_PASS": "your-app-password"
      }
    }
  }
}

Client	Config file path	Top-level key	Notes
Claude Desktop	`~/Library/Application Support/Claude/claude_desktop_config.json`	`mcpServers`	Windows: `%APPDATA%\Claude\...`
Cursor	`~/.cursor/mcp.json`	`mcpServers`	Or `.cursor/mcp.json` (project)
VS Code	`.vscode/mcp.json`	`servers`	Add `"type": "stdio"` inside the server entry
Windsurf	`~/.codeium/windsurf/mcp_config.json`	`mcpServers`
Zed	`~/.config/zed/settings.json`	`context_servers`

Streamable HTTP (any client)

Start the server with uv run python -m email_mcp_server.server --http, then:

Client	Config
Claude Code	`claude mcp add --transport http email-server http://localhost:8000/mcp`
Claude Desktop	`{ "type": "http", "url": "http://localhost:8000/mcp" }`
Cursor	`{ "url": "http://localhost:8000/mcp" }`
VS Code	`{ "type": "http", "url": "http://localhost:8000/mcp" }`
Windsurf	`{ "serverUrl": "http://localhost:8000/mcp" }`
Zed	`{ "url": "http://localhost:8000/mcp" }`

Provider Settings

Provider	Host	Notes
Gmail	`smtp.gmail.com`	Requires app password with 2FA enabled
Outlook	`smtp-mail.outlook.com`	Regular password or app password
Yahoo	`smtp.mail.yahoo.com`	Requires app password with 2FA enabled
iCloud	`smtp.mail.me.com`	Requires app password with 2FA enabled

All providers use port 587 with SMTP_SECURE=false (STARTTLS).

License

MIT License