Email Service Integration

This covers the full stack of email integration, from raw SMTP to SendGrid and AWS SES. You get working examples for transactional emails, password resets, and background sending with proper retry logic. The reference guides include MJML templates and FastAPI background tasks, which is smart since blocking on email sends kills performance. It's opinionated about the basics like requiring unsubscribe links and never sending synchronously. If you're adding email to any backend project, this gets you past the boilerplate and into production patterns quickly. The validation and error handling sections alone will save you from common deliverability headaches.