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Gmail AutoAuth MCP Server

A Model Context Protocol (MCP) server for Gmail integration in Claude Desktop with auto authentication support. This server enables AI assistants to manage Gmail through natural language interactions.

Features

• Send emails with subject, content, attachments, and recipients
• Full attachment support - send and receive file attachments
• Download email attachments to local filesystem
• Support for HTML emails and multipart messages with both HTML and plain text versions
• Full support for international characters in subject lines and email content
• Read email messages by ID with advanced MIME structure handling
• Enhanced attachment display showing filenames, types, sizes, and download IDs
• Search emails with various criteria (subject, sender, date range)
• Comprehensive label management with ability to create, update, delete and list labels
• List all available Gmail labels (system and user-defined)
• List emails in inbox, sent, or custom labels
• Mark emails as read/unread
• Move emails to different labels/folders
• Delete emails
• Batch operations for efficiently processing multiple emails at once
• Full integration with Gmail API
• Simple OAuth2 authentication flow with auto browser launch
• Support for both Desktop and Web application credentials
• Global credential storage for convenience

Installation & Authentication

Installing via Smithery

To install Gmail AutoAuth for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @gongrzhe/server-gmail-autoauth-mcp --client claude

Installing Manually

1. Create a Google Cloud Project and obtain credentials:

   a. Create a Google Cloud Project:

   • Go to Google Cloud Console
   • Create a new project or select an existing one
   • Enable the Gmail API for your project

   b. Create OAuth 2.0 Credentials:

   • Go to "APIs & Services" > "Credentials"
   • Click "Create Credentials" > "OAuth client ID"
   • Choose either "Desktop app" or "Web application" as application type
   • Give it a name and click "Create"
   • For Web application, add http://localhost:3000/oauth2callback to the authorized redirect URIs
   • Download the JSON file of your client's OAuth keys
   • Rename the key file to gcp-oauth.keys.json

2. Run Authentication:

   You can authenticate in two ways:

   a. Global Authentication (Recommended):

   # First time: Place gcp-oauth.keys.json in your home directory's .gmail-mcp folder
   mkdir -p ~/.gmail-mcp
   mv gcp-oauth.keys.json ~/.gmail-mcp/
   
   # Run authentication from anywhere
   npx @gongrzhe/server-gmail-autoauth-mcp auth
   

   b. Local Authentication:

   # Place gcp-oauth.keys.json in your current directory
   # The file will be automatically copied to global config
   npx @gongrzhe/server-gmail-autoauth-mcp auth
   

   The authentication process will:

   • Look for gcp-oauth.keys.json in the current directory or ~/.gmail-mcp/
   • If found in current directory, copy it to ~/.gmail-mcp/
   • Open your default browser for Google authentication
   • Save credentials as ~/.gmail-mcp/credentials.json

   Note:

   • After successful authentication, credentials are stored globally in ~/.gmail-mcp/ and can be used from any directory
   • Both Desktop app and Web application credentials are supported
   • For Web application credentials, make sure to add http://localhost:3000/oauth2callback to your authorized redirect URIs

3. Configure in Claude Desktop:

{
  "mcpServers": {
    "gmail": {
      "command": "npx",
      "args": [
        "@gongrzhe/server-gmail-autoauth-mcp"
      ]
    }
  }
}

Docker Support

If you prefer using Docker:

1. Authentication:

docker run -i --rm \
  --mount type=bind,source=/path/to/gcp-oauth.keys.json,target=/gcp-oauth.keys.json \
  -v mcp-gmail:/gmail-server \
  -e GMAIL_OAUTH_PATH=/gcp-oauth.keys.json \
  -e "GMAIL_CREDENTIALS_PATH=/gmail-server/credentials.json" \
  -p 3000:3000 \
  mcp/gmail auth

1. Usage:

{
  "mcpServers": {
    "gmail": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-v",
        "mcp-gmail:/gmail-server",
        "-e",
        "GMAIL_CREDENTIALS_PATH=/gmail-server/credentials.json",
        "mcp/gmail"
      ]
    }
  }
}

Cloud Server Authentication

For cloud server environments (like n8n), you can specify a custom callback URL during authentication:

npx @gongrzhe/server-gmail-autoauth-mcp auth https://gmail.gongrzhe.com/oauth2callback

Setup Instructions for Cloud Environment

1. Configure Reverse Proxy:

   • Set up your n8n container to expose a port for authentication
   • Configure a reverse proxy to forward traffic from your domain (e.g., gmail.gongrzhe.com) to this port

2. DNS Configuration:

   • Add an A record in your DNS settings to resolve your domain to your cloud server's IP address

3. Google Cloud Platform Setup:

   • In your Google Cloud Console, add your custom domain callback URL (e.g., https://gmail.gongrzhe.com/oauth2callback) to the authorized redirect URIs list

4. Run Authentication:

   npx @gongrzhe/server-gmail-autoauth-mcp auth https://gmail.gongrzhe.com/oauth2callback
   

5. Configure in your application:

   {
     "mcpServers": {
       "gmail": {
         "command": "npx",
         "args": [
           "@gongrzhe/server-gmail-autoauth-mcp"
         ]
       }
     }
   }
   ```…