Email Service Integration Builder

Build an email sending system for [APPLICATION TYPE].

Provider: [SENDGRID / AWS SES / POSTMARK / RESEND / MAILGUN]
Email types: [TRANSACTIONAL / MARKETING / BOTH]

Provide:
1. **Provider Setup**: Account creation, domain verification, DNS records
2. **Email Service Module**: Reusable email sending class/module with error handling
3. **Template System**: HTML email templates with variable injection
4. **Email Types**: Implementation for each:
   - Welcome email
   - Password reset
   - Invoice/receipt
   - Notification
   - Marketing newsletter
5. **Queue System**: For high-volume sending with retry logic
6. **Tracking**: Open tracking, click tracking, unsubscribe handling
7. **Testing**: Preview emails locally, send test emails, check spam score
8. **Deliverability**: SPF, DKIM, DMARC setup and monitoring
9. **Rate Limiting**: Respect provider limits and implement backoff
10. **Complete Code**: Full working implementation

Build an email sending system for [APPLICATION TYPE].

Provider: [SENDGRID / AWS SES / POSTMARK / RESEND / MAILGUN]
Email types: [TRANSACTIONAL / MARKETING / BOTH]

Provide:
1. **Provider Setup**: Account creation, domain verification, DNS records
2. **Email Service Module**: Reusable email sending class/module with error handling
3. **Template System**: HTML email templates with variable injection
4. **Email Types**: Implementation for each:
   - Welcome email
   - Password reset
   - Invoice/receipt
   - Notification
   - Marketing newsletter
5. **Queue System**: For high-volume sending with retry logic
6. **Tracking**: Open tracking, click tracking, unsubscribe handling
7. **Testing**: Preview emails locally, send test emails, check spam score
8. **Deliverability**: SPF, DKIM, DMARC setup and monitoring
9. **Rate Limiting**: Respect provider limits and implement backoff
10. **Complete Code**: Full working implementation