A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Boost your email opens with a punchy subject line. One Mississippi, two Mississippi… Keep your email subject line short and attention-grabbing. Try different email subject line styles to find what gets the most opens. Don’t make ‘em yawn! Keep your emails exciting and brief. Don’t forget to add a short preview description to encourage people to click on your email. Sit up straight.