Try different email subject line styles to find what gets the most opens. Let your imagination run wild. 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. Boost your email opens with a punchy subject line. Fighting off robots… A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.