Don’t forget to add a fun, relevant call-to-action button to your email. Don’t make ‘em yawn! Keep your emails exciting and brief. Not just a pretty interface Boost your email opens with a punchy subject line. Opening the door to unlimited creativity… Want the loading time to be longer so we can spend more time together :) A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Keep your email subject line short and attention-grabbing.