Email MCP Server

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
[email protected]
SMTP_PASS=your-app-password
[email protected]

# 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": "[email protected]",
    "password": "your-app-password",
    "from_email": "[email protected]"
  }
}

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": "[email protected]",
        "SMTP_FROM": "[email protected]",
        "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