A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Want the loading time to be longer so we can spend more time together :) Sit up straight. Time to get that bread. Is anyone even reading this? Try different email subject line styles to find what gets the most opens. Keep your email subject line short and attention-grabbing. Don’t forget to add a short preview description to encourage people to click on your email.