Feel free to spin in your chair while you wait Keep your email subject line short and attention-grabbing. Opening the door to unlimited creativity… Sit up straight. Don’t forget to add a short preview description to encourage people to click on your email. Generating witty text... A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Test, test, and test again! Make sure your email looks good on all devices before you send it out.