Get creative with emojis in email subject lines to increase open rates! Sit up straight. [insert fun loading text here] Boost your email opens with a punchy subject line. Try different email subject line styles to find what gets the most opens. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! My day’s been ok, how’s yours? Don’t forget to add a short preview description to encourage people to click on your email.