📧 Email System Implementation Summary

### **Core Components Added:**

1. **Email Service Architecture** (`server/src/email/`)
   - `service.rs` - Main EmailService with builder pattern
   - `providers.rs` - Multiple email providers (SMTP, SendGrid, Console)
   - `templates.rs` - Handlebars template engine with custom helpers
   - `types.rs` - All data structures and types
   - `mod.rs` - Module organization and error handling

2. **Email Providers Support:**
   - **SMTP Provider** - Gmail, Outlook, custom SMTP servers
   - **SendGrid Provider** - Professional email API service
   - **Console Provider** - Development/testing (prints to console)

3. **Template System:**
   - Handlebars-based templates with HTML and text versions
   - Custom helpers: date formatting, capitalization, truncation, defaults, URL encoding
   - Pre-built templates for contact forms, notifications, and support forms
   - Template directory structure: `templates/email/html/` and `templates/email/text/`

4. **API Endpoints** (`server/src/handlers/email/`)
   - `GET /api/email/status` - Email service status
   - `POST /api/email/contact` - Contact form submission
   - `POST /api/email/support` - Support form with priorities/categories
   - `POST /api/email/send` - Custom email sending (admin)
   - `POST /api/email/notification` - Notification emails

5. **Client Components** (`client/src/components/forms/`)
   - `ContactForm` - Complete contact form with validation
   - `SupportForm` - Enhanced support form with priorities and categories
   - Real-time validation, error handling, success feedback
   - Fully responsive with Tailwind CSS styling

6. **Configuration System:**
   - Extended email configuration in `config/mod.rs`
   - Environment variable support
   - Multiple provider configurations
   - Security-focused defaults

### **Key Features:**

✅ **Multiple Email Providers** - Easy switching between SMTP, SendGrid, and Console
✅ **Template Engine** - Handlebars templates with custom helpers
✅ **Form Components** - Ready-to-use contact and support forms
✅ **Validation & Security** - Input validation, rate limiting, CSRF protection
✅ **Error Handling** - Comprehensive error handling and user feedback
✅ **Documentation** - Complete documentation with examples
✅ **Configuration** - Flexible configuration with environment variables
✅ **Testing Support** - Console provider for development and testing

### **Files Created/Modified:**

**Server-side:**
- `server/Cargo.toml` - Added email dependencies
- `server/src/email/` - Complete email module
- `server/src/handlers/email/` - Email API handlers
- `server/src/main.rs` - Email service integration
- `templates/email/` - Email templates (HTML & text)
- `config/email.toml` - Email configuration example

**Client-side:**
- `client/src/components/forms/` - Form components
- `client/src/pages/contact.rs` - Complete contact page example

**Documentation:**
- `docs/EMAIL.md` - Comprehensive email system documentation
- `README.md` - Updated with email feature information

### **Usage Examples:**

**Send a simple email:**
```rust
let result = email_service.send_simple_email(
    "user@example.com",
    "Welcome!",
    "Thank you for signing up!"
).await?;
```

**Use contact form component:**
```jsx
<ContactForm
    title="Get in Touch"
    recipient="contact@yourapp.com"
    showSuccess={true}
/>
```

**Configure SMTP provider:**
```toml
[email]
provider = "smtp"
smtp_host = "smtp.gmail.com"
smtp_port = 587
smtp_username = "your-email@gmail.com"
smtp_password = "your-app-password"
smtp_use_starttls = true
```

The email system is now fully integrated into the Rustelo framework and ready for production use! It provides everything needed for form submissions, user communications, notifications, and more. The modular design allows developers to easily extend it with additional providers or customize the templates and forms for their specific needs.
