Sit up straight. Get creative with emojis in email subject lines to increase open rates! Feel free to spin in your chair while you wait Avoid getting marked as spam! Only email people who have agreed to receive emails from you. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Generating witty text... Try different email subject line styles to find what gets the most opens. Don’t forget to add a short preview description to encourage people to click on your email.