Get creative with emojis in email subject lines to increase open rates! One Mississippi, two Mississippi… Don’t forget to add a fun, relevant call-to-action button to your email. My day’s been ok, how’s yours? Time to get that bread. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Sit up straight. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.