Don’t forget to add a short preview description to encourage people to click on your email. I’m worth the wait Don’t forget to add a fun, relevant call-to-action button to your email. Keep your email subject line short and attention-grabbing. Let your imagination run wild. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Feel free to spin in your chair while you wait Boost your email opens with a punchy subject line.