MCP Mail Server

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A Model Context Protocol server for IMAP/SMTP email operations with Claude, Cursor, and other AI assistants.

Features

• IMAP Operations: Search, read, and manage emails across mailboxes
• SMTP Support: Send emails with HTML/text content and attachments
• Secure Configuration: Environment-based setup with TLS/SSL support
• AI-Friendly: Natural language commands for email operations
• Auto Connection Management: Automatic IMAP/SMTP connection handling
• Multi-Mailbox Support: Access INBOX, Sent, and custom folders

Quick Start

1. Install: npm install -g mcp-mail-server
2. Configure environment variables (see Configuration)
3. Add to your MCP client configuration
4. Use natural language: "Show me unread emails from today"

Installation

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "mcp-mail-server": {
      "command": "npx",
      "args": ["mcp-mail-server"],
      "env": {
        "IMAP_HOST": "your-imap-server.com",
        "IMAP_PORT": "993",
        "IMAP_SECURE": "true",
        "SMTP_HOST": "your-smtp-server.com",
        "SMTP_PORT": "465",
        "SMTP_SECURE": "true",
        "EMAIL_USER": "[email protected]",
        "EMAIL_PASS": "your-password"
      }
    }
  }
}

Add to your Cursor MCP settings:

{
  "mcpServers": {
    "mcp-mail-server": {
      "command": "npx",
      "args": ["mcp-mail-server"],
      "env": {
        "IMAP_HOST": "your-imap-server.com",
        "IMAP_PORT": "993",
        "IMAP_SECURE": "true",
        "SMTP_HOST": "your-smtp-server.com",
        "SMTP_PORT": "465",
        "SMTP_SECURE": "true",
        "EMAIL_USER": "[email protected]",
        "EMAIL_PASS": "your-password"
      }
    }
  }
}

For global installation:

npm install -g mcp-mail-server

Then configure with:

{
  "mcpServers": {
    "mcp-mail-server": {
      "command": "mcp-mail-server"
    }
  }
}

Available Tools

| Tool | Description | |------|-------------| | connect_all | Connect to both IMAP and SMTP servers | | get_connection_status | Check connection status and server info | | disconnect_all | Disconnect from all servers | | open_mailbox | Open specific mailbox/folder | | list_mailboxes | List available mail folders | | search_messages | Search emails with IMAP criteria | | search_by_sender | Find emails from specific sender | | search_by_subject | Search by subject keywords | | search_by_body | Search message content | | search_since_date | Find emails since date | | search_unreplied_from_sender | Find unreplied emails from specific sender | | search_larger_than | Find emails by size | | get_message | Retrieve email by UID | | get_messages | Retrieve multiple emails | | delete_message | Delete email by UID | | get_unseen_messages | Get all unread emails | | get_recent_messages | Get recent emails | | send_email | Send email via SMTP | | reply_to_email | Reply to specific email |

Connection Management

• connect_all: No parameters required
• get_connection_status: No parameters required
• disconnect_all: No parameters required

Mailbox Operations

• open_mailbox: mailboxName (string, default: "INBOX"), readOnly (boolean)
• list_mailboxes: No parameters required

Search Operations

• search_messages: criteria (array, IMAP search criteria)
• search_by_sender: sender (string, email address)
• search_by_subject: subject (string, keywords)
• search_by_body: text (string, search text)
• search_since_date: date (string, date format)
• search_unreplied_from_sender: sender (string, email address), startDate (string, optional), endDate (string, optional)
• search_larger_than: size (number, bytes)

Message Operations

• get_message: uid (number), markSeen (boolean, optional)
• get_messages: uids (array), markSeen (boolean, optional)
• delete_message: uid (number)

Email Sending

• send_email: to (string), subject (string), text (string, optional), html (string, optional), cc (string, optional), bcc (string, optional)
• reply_to_email: originalUid (number), text (string), html (string, optional), replyToAll (boolean, optional), includeOriginal (boolean, optional)

Usage Examples

Use natural language commands with your AI assistant:

Basic Operations

• "Connect to my email servers"
• "Show me all unread emails"
• "Search for emails from [email protected]"
• "Send an email to [email protected] about the meeting"
• "Reply to email with UID 123"

Advanced Searches

• "Find emails with 'urgent' in the subject from last week"
• "Show me unreplied emails from [email protected]"
• "Show me large emails over 5MB"
• "Get all emails from the Sales folder"

Email Management

• "Delete the email with UID 123"
• "Mark recent emails as read"
• "List all my email folders"

Configuration

Environment Variables

⚠️ All variables are required

| Variable | Description | Example | |----------|-------------|---------| | IMAP_HOST | IMAP server address | imap.gmail.com | | IMAP_PORT | IMAP port number | 993 | | IMAP_SECURE | Enable TLS | true | | SMTP_HOST | SMTP server address | smtp.gmail.com | | SMTP_PORT | SMTP port number | 465 | | SMTP_SECURE | Enable SSL | true | | EMAIL_USER | Email username | [email protected] | | EMAIL_PASS | Email password/app password | your-app-password |

Common Email Providers

IMAP_HOST=imap.gmail.com
IMAP_PORT=993
IMAP_SECURE=true
SMTP_HOST=smtp.gmail.com
SMTP_PORT=465
SMTP_SECURE=true
[email protected]
EMAIL_PASS=your-app-password

Note: Use App Passwords instead of your regular password.

IMAP_HOST=outlook.office365.com
IMAP_PORT=993
IMAP_SECURE=true
SMTP_HOST=smtp.office365.com
SMTP_PORT=587
SMTP_SECURE=true
[email protected]
EMAIL_PASS=your-password

Security Notes

• Use App Passwords: Enable 2FA and use app-specific passwords when available
• TLS/SSL Required: Always use secure connections (IMAP_SECURE=true, SMTP_SECURE=true)
• Environment Variables: Never hardcode credentials in configuration files

Development

1. Clone the repository:

   git clone https://github.com/yunfeizhu/mcp-mail-server.git
   cd mcp-mail-server

2. Install dependencies:

   npm install

3. Build the project:

   npm run build

4. Set environment variables:

   export IMAP_HOST=your-imap-server.com
   export IMAP_PORT=993
   export IMAP_SECURE=true
   export SMTP_HOST=your-smtp-server.com
   export SMTP_PORT=465
   export SMTP_SECURE=true
   export [email protected]
   export EMAIL_PASS=your-password

5. Run the server:

   npm start

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see LICENSE file for details.

Package Information:

• Package: mcp-mail-server
• Node.js: ≥18.0.0
• Repository: GitHub
• Issues: Report bugs