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. Try different email subject line styles to find what gets the most opens. Boost your email opens with a punchy subject line. My day’s been ok, how’s yours? Let your imagination run wild. Not just a pretty interface Don’t forget to add a short preview description to encourage people to click on your email.