51% of emails are opened on mobile devices - don’t forget to check the mobile preview for your email! [insert fun loading text here] Don’t forget to add a short preview description to encourage people to click on your email. 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. Boost your email opens with a punchy subject line. Keep your email subject line short and attention-grabbing.