Why can't I use regular HTML and CSS for emails?
Email clients (Gmail, Outlook) strip <style> tags, don't support flexbox/grid, block JavaScript, and may not load external fonts or images. You must use inline CSS, tables for layout, system fonts, and hosted image URLs. Email HTML is very different from web HTML.
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More FAQs in Email Templates and HTML Design Creating Professional Emails for Node.js
600px is the standard email width. This fits most email client preview panes (Gmail, Outlook, Apple Mail). For responsive design, use percentage widths and media queries (though some clients strip <style> tags, so test carefully).
MJML is a markup language specifically for emails. You write simple MJML XML, and it compiles to responsive email HTML that works across all clients. It handles tables, inline CSS, and responsive design automatically, saving hours of manual HTML work.
Use mail-tester.com to send a test email and get a spam score (aim for 9-10/10). Use Litmus or Email on Acid (paid) to test across 90+ email clients. Also manually test in Gmail, Outlook, and Apple Mail on desktop and mobile.
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