Don’t forget to add a short preview description to encourage people to click on your email. Opening the door to unlimited creativity… Don’t make ‘em yawn! Keep your emails exciting and brief. Keep your email subject line short and attention-grabbing. Try different email subject line styles to find what gets the most opens. 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Sit up straight. Boost your email opens with a punchy subject line.