Fighting off robots… I’m worth the wait Don’t forget to add a fun, relevant call-to-action button to your email. Don’t forget to add a short preview description to encourage people to click on your email. 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. My day’s been ok, how’s yours? Try different email subject line styles to find what gets the most opens.