FWIW the Tailwind implementation in react-email is not well done. The code double render React to static markup just to parse it into DOM then parse out the style and className attributes using a lot of regex https://github.com/resendlabs/react-email/blob/main/packages....

It's likely to be brittle and also very slow - slow enough to almost cause an incident when we tried to use it in production because emails were taking _seconds_ to render.