How to Inline CSS for HTML Email, The Complete Guide

Crosspost note. Originally published at min8t.com/articles/inline-css-for-email. I'm one of the maintainers of MiN8T, which makes the in-browser CSS inliner referenced at the end. The technical content here applies regardless of which inliner you reach for. You write CSS in a <style> block, the way you have for two decades on the web. You hit send. Half your subscribers see your beautiful design. The other half see something else: a colorless wall of text, a stack of mis-aligned images,...