Fighting off robots… Not just a pretty interface Don’t forget to add a fun, relevant call-to-action button to your email. Boost your email opens with a punchy subject line. Is anyone even reading this? A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Get creative with emojis in email subject lines to increase open rates! Don’t forget to add a short preview description to encourage people to click on your email.