A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Feel free to spin in your chair while you wait Don’t make ‘em yawn! Keep your emails exciting and brief. Get creative with emojis in email subject lines to increase open rates! One Mississippi, two Mississippi… Join 4 million members in making awesome marketing content. Generating witty text... Keep your email subject line short and attention-grabbing.