Let your imagination run wild. Sit up straight. Not just a pretty interface Try different email subject line styles to find what gets the most opens. Test, test, and test again! Make sure your email looks good on all devices before you send it out. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. We’re very font of you because you’re our type. Keep your email subject line short and attention-grabbing.