A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Let your imagination run wild. Not just a pretty interface Time to get that bread. Test, test, and test again! Make sure your email looks good on all devices before you send it out. Try different email subject line styles to find what gets the most opens. Don’t forget to add a fun, relevant call-to-action button to your email. Sit up straight.