A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. I’m worth the wait 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. One Mississippi, two Mississippi… Generating witty text... Boost your email opens with a punchy subject line. Don’t make ‘em yawn! Keep your emails exciting and brief.