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! Don’t forget to add a fun, relevant call-to-action button to your email. Keep your email subject line short and attention-grabbing. Not just a pretty interface Boost your email opens with a punchy subject line. Let your imagination run wild. Don’t forget to add a short preview description to encourage people to click on your email.