A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. I wish I looked as good as you while waiting Get creative with emojis in email subject lines to increase open rates! Is anyone even reading this? One Mississippi, two Mississippi… Sit up straight. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Don’t forget to add a short preview description to encourage people to click on your email.