51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Try different email subject line styles to find what gets the most opens. Don’t forget to add a fun, relevant call-to-action button to your email. Not just a pretty interface 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. Generating witty text... Sit up straight.