# CyberSMTP: WordPress SMTP Plugin

## Project Overview & Architecture

### Core Plugin Structure
```
CyberSMTP/
├── cybersmtp.php (main plugin file)
├── includes/
│   ├── class-plugin-core.php
│   ├── class-mailer.php
│   ├── class-email-logger.php
│   ├── class-settings.php
│   └── providers/
├── admin/
│   ├── views/
│   ├── assets/
│   └── class-admin.php
├── public/
├── languages/
└── vendor/ (Composer dependencies)
```

## Key Features Implementation Strategy

### 1. Multiple SMTP Provider Support
- Gmail/Google Workspace
- Outlook/Office 365
- SendGrid
- Mailgun
- Amazon SES
- SMTP.com
- Postmark
- Generic SMTP

**Implementation:**
- Abstract provider class
- Individual provider classes
- Provider-specific authentication (OAuth2, API keys, SMTP credentials)
- Dynamic provider switching

### 2. Email Authentication & Security
- SPF record validation
- DKIM signing support
- DMARC compliance checking
- TLS/SSL enforcement

**Implementation:**
- Integrate PHPMailer
- Custom DKIM library or existing solutions
- DNS record verification tools
- Security validation dashboard

### 3. Email Logging & Analytics
- Email delivery tracking
- Open/click tracking (optional)
- Bounce handling
- Delivery status monitoring
- Analytics dashboard

**Database:**
- Email logs table
- Tracking events table
- Provider statistics table

### 4. Email Testing & Debugging
- Test email functionality
- SMTP connection testing
- Email preview
- Debug mode with logs
- Connection troubleshooting

### 5. Email Templates & Design
- Template builder/editor
- Pre-designed templates
- Custom HTML/CSS support
- Responsive designs
- Template versioning

## Technical Implementation Plan

### Phase 1: Core Foundation (Weeks 1-3)
- Plugin bootstrap (main file, hooks, autoloader, admin UI)
- Database setup (schema, migrations)
- Basic SMTP integration (PHPMailer, override wp_mail, config UI)

### Phase 2: Provider Integration (Weeks 4-6)
- Abstract provider class
- 2-3 major providers (Gmail, SendGrid, Mailgun)
- Provider config screens
- OAuth2 for supported providers

### Phase 3: Advanced Features (Weeks 7-10)
- Email logging system
- Delivery status tracking
- Admin log viewer
- Export functionality

### Phase 4: Security & Authentication (Weeks 11-12)
- DKIM, SPF, DMARC tools
- Secure credential storage
- Input validation, nonce verification

### Phase 5: UI/UX & Polish (Weeks 13-14)
- Modern admin dashboard
- Settings organization
- Help docs
- Template system

## Technical Requirements
- WordPress Coding Standards
- Sanitization/validation
- WordPress APIs (Settings, Options)
- i18n ready
- Capability-based access

### Composer Packages
- PHPMailer
- League/OAuth2-Client
- Monolog
- Twig

### Security
- Encrypt credentials
- Nonce verification
- Sanitize inputs
- Prepared statements
- Capability checks

## Database Schema

### Email Logs Table
```sql
CREATE TABLE wp_cybersmtp_email_logs (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    to_email VARCHAR(255),
    subject TEXT,
    body LONGTEXT,
    headers TEXT,
    provider VARCHAR(50),
    status VARCHAR(20),
    created_at DATETIME,
    updated_at DATETIME,
    response_data TEXT
);
```

### Settings Table
```sql
CREATE TABLE wp_cybersmtp_settings (
    id INT AUTO_INCREMENT PRIMARY KEY,
    option_name VARCHAR(255),
    option_value LONGTEXT,
    autoload VARCHAR(3) DEFAULT 'yes'
);
```

## Development Tools & Workflow
- Local WP dev
- Git
- Composer
- NPM/Webpack

## Testing
- PHPUnit
- WP integration tests
- Manual provider tests
- Performance testing

## Documentation
- Inline code docs
- User docs/help
- API docs
- Setup guides

## Marketing & Distribution
- Free: Basic SMTP, 2-3 providers, basic logging, test email
- Premium: All providers, analytics, template builder, automation, support
- WP.org repo: plugin guidelines, updates, support, readme.txt

## Timeline
- Dev: 14-16 weeks
- Beta: 2-3 weeks
- WP.org review: 1-2 weeks
- Launch/support: Ongoing

## Key Success Factors
- Reliability
- UX
- Performance
- Security
- Support
- Compatibility