One Mississippi, two Mississippi… Don’t forget to add a fun, relevant call-to-action button to your email. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Get creative with emojis in email subject lines to increase open rates! My day’s been ok, how’s yours? Try different email subject line styles to find what gets the most opens. Generating witty text... Let your imagination run wild.