Guides

Technical reference guides for HTML email development. All free.

How EmailingSimply compatibility data is gathered, what it means, and how to interpret the compatibility matrix on each component.

How dark mode works across email clients, what problems it causes, and how to handle them reliably.

Why Gmail clips emails over 102KB, how to check your email size, and what to cut to stay under the limit.

The technical stack behind EmailingSimply — Nuxt 3, Nuxt Content, Firebase, and how components are defined in Markdown.

Why Outlook is uniquely difficult for HTML email and the specific techniques required to make emails render correctly.