One Mississippi, two Mississippi… Don’t forget to add a fun, relevant call-to-action button to your email. I wish I looked as good as you while waiting Get creative with emojis in email subject lines to increase open rates! Sit up straight. Don’t forget to add a short preview description to encourage people to click on your email. Boost your email opens with a punchy subject line. Don’t make ‘em yawn! Keep your emails exciting and brief.