How do you create a responsive HTML email template that works on both desktop and mobile devices?

A responsive HTML email template requires specific coding techniques to work across devices. You need to use internal styles and inline CSS while making tables with 100% width and fixed maximum widths (600px is standard). The key is implementing breakpoints that allow content to shift from multi-column layouts on desktop to single-column layouts on mobile. In the tutorial, this is accomplished using table structures with column classes that respond to screen size. This responsive approach ensures all content remains readable and properly formatted whether viewed in Gmail on desktop or in email apps on mobile phones.