Keep your email subject line short and attention-grabbing. Sit up straight. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Don’t make ‘em yawn! Keep your emails exciting and brief. Try different email subject line styles to find what gets the most opens. We’re very font of you because you’re our type. Fighting off robots… Don’t forget to add a fun, relevant call-to-action button to your email.