MiniMail MCP Server

Multi-service email platform for MCP-compatible clients.

Version 0.3.0-alpha - FastMCP 2.14.3 Standards Compliance

See CHANGELOG.md for version history.

Features

Email Services

• SMTP/IMAP: Standard email providers (Gmail, Outlook, Yahoo, iCloud, ProtonMail)

• Transactional APIs: SendGrid, Mailgun, Resend, Amazon SES, Postmark

• Local Testing: MailHog, Mailpit, MailCatcher, Inbucket

• Webhook Integration: Slack, Discord, Telegram, GitHub

Core Functionality

• Send emails via multiple service types

• Check inbox via IMAP and service APIs

• Dynamic service configuration at runtime

• Email header decoding (UTF-8, Base64, Quoted-Printable)

• Async operations with connection pooling

• Service health monitoring and testing

Standards Compliance

• FastMCP 2.14.3 protocol support

• MCPB packaging for Claude Desktop

• Zed extension support

• Conversational tool returns

• Structured logging with JSON output

Standards Compliance

This minimail-mcp implements current MCP server standards:

MCPB Packaging (Claude Desktop)

• Complete manifest.json with tool definitions

• Prompt templates for Claude Desktop integration

• Self-contained source code packaging

• Icon and documentation assets

Glama Integration

• glama.json configuration for Glama MCP client discovery

• Feature categorization and capability descriptions

• Code review and documentation generation configuration

• Status and development information

CI/CD Pipeline

• GitHub Actions workflow with multi-Python version testing (3.10, 3.11, 3.12)

• Automated linting with Ruff

• Type checking with MyPy

• Test coverage reporting

• Security scanning with Bandit

• Package building and MCPB creation

• PyPI publishing requires account setup

Monitoring Stack

• Health check system for email services

• Performance metrics collection

• System resource monitoring

• Service availability tracking

Development Standards

• Testing suite with pytest

• Code quality enforcement with Ruff and MyPy

• Project structure with src/ layout

• Dependency management with pyproject.toml

• Documentation and examples

Supported Services

Standard Email Providers

• Gmail - SMTP/IMAP with App Passwords

• Outlook/Hotmail - SMTP/IMAP

• Yahoo Mail - SMTP/IMAP

• iCloud Mail - SMTP/IMAP

• ProtonMail - SMTP/IMAP (requires ProtonMail Bridge for free accounts, or paid account for direct access)

Transactional Email APIs

• SendGrid - Enterprise email delivery

• Mailgun - Developer-friendly email API

• Resend - Modern email API

• Amazon SES - AWS email service

• Postmark - Reliable transactional email

Local Testing Services

• MailHog - Web UI for email testing

• Mailpit - Modern mail testing

• MailCatcher - Ruby-based testing

• Inbucket - Lightweight testing

Webhook/Dev Services

• Slack - Send emails as Slack messages

• Discord - Send emails as Discord messages

• Telegram - Bot message forwarding

• GitHub - Email to issue/PR comments

🚀 Installation

Prerequisites

• uv installed (RECOMMENDED)

• Python 3.12+

📦 Quick Start

Run immediately via uvx:

uvx email-mcp

🎯 Claude Desktop Integration

Add to your claude_desktop_config.json:

"mcpServers": {
  "email-mcp": {
    "command": "uv",
    "args": ["--directory", "D:/Dev/repos/email-mcp", "run", "email-mcp"]
  }
}

🚀 Installation

Prerequisites

• uv installed (RECOMMENDED)

• Python 3.12+

📦 Quick Start

Run immediately via uvx:

uvx email-mcp

🎯 Claude Desktop Integration

Add to your claude_desktop_config.json:

"mcpServers": {
  "email-mcp": {
    "command": "uv",
    "args": ["--directory", "D:/Dev/repos/email-mcp", "run", "email-mcp"]
  }
}

Claude Desktop (MCPB)

1. Download the minimail-mcp.mcpb package (when built)

2. Drag and drop into Claude Desktop settings

3. The server will be automatically configured

Glama Client

The server is automatically discoverable by Glama.ai's GitHub scraping system through the glama.json configuration.

Gmail Integration

The minimail-mcp supports Gmail SMTP with App Password authentication:

Configuration

{
  "SenderEmail": "your-email@gmail.com",
  "SenderName": "Your Name",
  "SmtpServer": "smtp.gmail.com",
  "SmtpPort": 587,
  "SmtpUsername": "your-email@gmail.com",
  "SmtpPassword": "your-gmail-app-password"
}

Setup Steps

1. Enable 2-Factor Authentication on Gmail account

2. Generate App Password at https://myaccount.google.com/apppasswords

3. Use App Password for SMTP authentication

4. Configure using configure_service() or environment variables

Supported Features

• SMTP email sending with TLS encryption

• HTML and plain text email formats

• CC/BCC recipient support

• Authentication with App Passwords

• Error handling and connection testing

ProtonMail Integration

The minimail-mcp supports ProtonMail with different setup requirements based on your account type:

Free Accounts (ProtonMail Bridge Required)

Free ProtonMail accounts require the ProtonMail Bridge application:

Setup Steps

1. Download ProtonMail Bridge: https://proton.me/mail/bridge

2. Install and configure Bridge with your ProtonMail account

3. Bridge creates local SMTP/IMAP servers (default ports: 1025 SMTP, 1143 IMAP)

Configuration

{
  "SenderEmail": "your@protonmail.com",
  "SenderName": "Your Name",
  "SmtpServer": "127.0.0.1",
  "SmtpPort": 1025,
  "SmtpUsername": "your-username",
  "SmtpPassword": "your-protonmail-password",
  "ImapServer": "127.0.0.1",
  "ImapPort": 1143,
  "ImapUsername": "your-username",
  "ImapPassword": "your-protonmail-password"
}

Environment Variables

export SMTP_SERVER="127.0.0.1"
export SMTP_PORT="1025"
export SMTP_USER="your-username"
export SMTP_PASSWORD="your-protonmail-password"
export IMAP_SERVER="127.0.0.1"
export IMAP_PORT="1143"
export IMAP_USER="your-username"
export IMAP_PASSWORD="your-protonmail-password"

Paid Accounts (Direct Access)

Paid ProtonMail accounts support direct SMTP/IMAP access:

Configuration

{
  "SenderEmail": "your@protonmail.com",
  "SenderName": "Your Name",
  "SmtpServer": "mail.protonmail.com",
  "SmtpPort": 587,
  "SmtpUsername": "your@protonmail.com",
  "SmtpPassword": "your-protonmail-password",
  "ImapServer": "mail.protonmail.com",
  "ImapPort": 993,
  "ImapUsername": "your@protonmail.com",
  "ImapPassword": "your-protonmail-password"
}

Environment Variables

export SMTP_SERVER="mail.protonmail.com"
export SMTP_PORT="587"
export SMTP_USER="your@protonmail.com"
export SMTP_PASSWORD="your-protonmail-password"
export IMAP_SERVER="mail.protonmail.com"
export IMAP_PORT="993"
export IMAP_USER="your@protonmail.com"
export IMAP_PASSWORD="your-protonmail-password"

Setup Steps for Paid Accounts

1. Enable SMTP/IMAP access in ProtonMail settings

2. Use your regular ProtonMail password (no app passwords needed)

3. Configure using configure_service() or environment variables

Supported Features

• SMTP email sending with TLS encryption

• IMAP inbox checking and management

• HTML and plain text email formats

• CC/BCC recipient support

• Automatic email header decoding

• Error handling and connection testing

Notes

• Free accounts: ProtonMail Bridge must be running for email access

• Paid accounts: Direct SMTP/IMAP access available without additional software

• Security: ProtonMail uses end-to-end encryption for all communications

• Compatibility: Works with all Email MCP features including AI collaboration

⚙️ Configuration

Basic SMTP/IMAP (Backward Compatible)

Set environment variables for standard email providers:

export SMTP_SERVER="smtp.gmail.com"
export SMTP_PORT="587"
export SMTP_USER="your-email@gmail.com"
export SMTP_PASSWORD="your-app-password"
export IMAP_SERVER="imap.gmail.com"
export IMAP_USER="your-email@gmail.com"
export IMAP_PASSWORD="your-app-password"

API Services

Configure transactional email APIs:

# SendGrid
export SENDGRID_API_KEY="your-sendgrid-api-key"
export SENDGRID_FROM_EMAIL="noreply@yourdomain.com"

# Mailgun
export MAILGUN_API_KEY="your-mailgun-api-key"
export MAILGUN_DOMAIN="yourdomain.com"
export MAILGUN_FROM_EMAIL="noreply@yourdomain.com"

# Resend
export RESEND_API_KEY="your-resend-api-key"
export RESEND_FROM_EMAIL="noreply@yourdomain.com"

Local Testing Services

Enable local email testing:

# MailHog
export MAILHOG_ENABLED="true"
export MAILHOG_SMTP_HOST="localhost"
export MAILHOG_SMTP_PORT="1025"
export MAILHOG_HTTP_URL="http://localhost:8025"

Webhook Services

Configure chat/webhook integrations:

# Slack
export SLACK_WEBHOOK_URL="https://example.com/docs/slack-incoming-webhook"

Cursor IDE Configuration

Add to your mcp.json:

{
  "mcpServers": {
    "minimail-mcp": {
      "command": "python",
      "args": ["-m", "email_mcp.server"],
      "env": {
        "PYTHONPATH": "D:/Dev/repos/minimail-mcp/src"
      }
    }
  }
}

Usage Examples

Conversational Usage

Send a basic email:

"Send an email to user@example.com with subject 'Hello World' and body 'This is a test message'"

Send HTML email via SendGrid:

"Send a welcome email to newuser@company.com using SendGrid. Subject: 'Welcome to Our Service'. Include HTML content with a welcome header and thank you message."

Send notification to Slack:

"Send an alert message to the #dev-alerts Slack channel about high CPU usage detected on production server."

Check unread emails:

"Check my inbox and show me the last 10 unread emails."

Test email service:

"Is my Gmail service configured correctly? Test the connection."

Configure new service:

"Add SendGrid as a new email service with my API key. From email should be noreply@mydomain.com."

List available services:

"What email services do I have configured?"

## 🛠️ API Reference

### Tools

| Tool | Description | Services Supported |
|------|-------------|-------------------|
| `send_email` | Send emails via any service | All services |
| `check_inbox` | Check inbox via IMAP/API | SMTP, Local services |
| `email_status` | Test service connectivity | All services |
| `configure_service` | Add services dynamically | Runtime configuration |
| `list_services` | List configured services | Service management |
| `email_help` | Get help and documentation | Documentation |

### Service Types

| Type | Description | Examples | Inbox Support |
|------|-------------|----------|----------------|
| `smtp` | Standard SMTP/IMAP | Gmail, Outlook, Yahoo | ✅ |
| `api` | Transactional APIs | SendGrid, Mailgun, Resend | ❌ |
| `local` | Testing services | MailHog, Mailpit | ✅ |
| `webhook` | Chat integrations | Slack, Discord | ❌ |

## Architecture

- Multi-service email support (SMTP/IMAP, transactional APIs, local testing, webhooks)
- Dynamic service configuration without restart
- Backward compatible with existing SMTP/IMAP configurations
- Async operations for non-blocking email handling
- Extensible design for adding new service types

## Features

- Support for multiple email service types (SMTP, API, local testing, webhooks)
- Dynamic service configuration at runtime
- Async operations with connection pooling
- Email header decoding and error handling
- Service health monitoring  

## Development

```powershell
# Install
pip install -e ".[dev]"

# Run tests
pytest

# Format code
black src/
ruff check src/

PyPI Publishing Setup (Optional)

When ready to publish to PyPI:

1. Create PyPI account: Visit https://pypi.org/account/register/

2. Generate API token: Go to https://pypi.org/manage/account/token/

3. Add to GitHub: Add PYPI_API_TOKEN secret to repository settings

4. Enable publishing: Change CI/CD condition from false to proper tag condition

5. Tag release: git tag v0.2.1 && git push origin v0.2.1

License

MIT

🌐 Webapp Dashboard

This MCP server includes a free, premium web interface for monitoring and control. By default, the web dashboard runs on port 10812. (Assigned ports:

To start the webapp:

1. Navigate to the webapp (or web, frontend) directory.

2. Run start.bat (Windows) or ./start.ps1 (PowerShell).

3. Open http://localhost:10812 in your browser.