A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Fighting off robots… Don’t forget to add a short preview description to encourage people to click on your email. One Mississippi, two Mississippi… Try different email subject line styles to find what gets the most opens. Sit up straight. 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!