I wish I looked as good as you while waiting Keep your email subject line short and attention-grabbing. Boost your email opens with a punchy subject line. Not just a pretty interface Feel free to spin in your chair while you wait 51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! Try different email subject line styles to find what gets the most opens. Don’t make ‘em yawn! Keep your emails exciting and brief.