External css in html email?

Question

If I code an email template in html, it is probably wisest to embed the CSS directly in the html? Or is there a "foolproof" way to link an external CSS file without it causing issues? The images are on the web server, so wouldn't it be smarter having the CSS file there, too, instead of in the email for everyone to see, especially if it contains a company's corporate design elements?

Answer 1

This isn't recommended. Bundle all your CSS in the email.