Feel free to spin in your chair while you wait One Mississippi, two Mississippi… Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line. Test, test, and test again! Make sure your email looks good on all devices before you send it out. Let your imagination run wild. Don’t make ‘em yawn! Keep your emails exciting and brief. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails.