# Templating and on-brand design

> Email clients are hostile rendering environments. Use a constrained template system, keep brand tokens centralized, and treat AI generation as a production accelerator that still needs human QA in clients.

HTML email constraints, MJML and React Email, and AI-assisted on-brand generation.

## Lessons

- [HTML email, MJML, and React Email](/lessons/html-email-and-mjml): Practical templating approaches that survive real inboxes.
- [On-brand AI email generation](/lessons/on-brand-ai-generation): What AI-native ESPs actually change about production speed.

**Canonical:** https://emailmarketing.sh/courses/templating-and-design

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