Get creative with emojis in email subject lines to increase open rates! One Mississippi, two Mississippi… Opening the door to unlimited creativity… Don’t make ‘em yawn! Keep your emails exciting and brief. Don’t forget to add a short preview description to encourage people to click on your email. Keep your email subject line short and attention-grabbing. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.