I agree. Just baking all classes into inline styles before even presenting the mail should fix this. It makes sense to do this anyway. Pseudo classes and media

I agree. Just baking all classes into inline styles before even presenting the mail should fix this. It makes sense to do this anyway. Pseudo classes and media queries wouldn't work, but those would pose a security risk anyway and are not supported by major mail clients (see https://www.caniemail.com/features/css-at-media/ https://www.caniemail.com/features/css-at-media/)